victron energy 150-35 Smart Solar MPPT User Guide

Victron Energy 150-35 Smart Solar MPPT

Specifications

• Product Name: SmartSolar MPPT 150/35 & 150/45
• Model: MPPT Solar Charger
• Revision: Rev 06 – 01/2024

Safety Precautions

Ensure to read and follow all safety precautions mentioned in the manual before using the MPPT solar charger.

Introduction

The SmartSolar MPPT 150/35 & 150/45 is designed to optimize the charging of batteries using solar power. It supports battery voltage, PV voltage, and current ratings.

Features

The MPPT solar charger offers advanced features such as efficient power conversion, intelligent charging algorithms, and compatibility with various battery types.

Installation

Follow the installation instructions provided in the manual to correctly set up the MPPT solar charger with your solar panels and batteries.

Configuration and Settings

Learn how to change settings using the VictronConnect app, rotary switch, or MPPT Control display. Update firmware, enable/disable Bluetooth, and set up VE. Smart Networking for enhanced control.

Operation

Understand the shutdown and restart procedures, as well as maintenance tasks required for optimal performance of the MPPT solar charger.

Monitoring

Utilize LED indications, error code interpretations, and monitoring via the VictronConnect app or a GX device with VRM for real-time monitoring and troubleshooting.

FAQs

Q: How can I update the firmware of the MPPT solar charger?
A: To update the firmware, follow the instructions provided in section 5.3 of the manual. Ensure a stable power supply during the update process.

Q: Can I use the MPPT solar charger with different battery types?
A: Yes, the MPPT solar charger is compatible with various battery types. Refer to the manual for specific details on supported batteries.

MPPT solar charger manual

1.1. General safety precautions
· Read this manual carefully. It contains important instructions that need to be followed during installation, operation and maintenance.
· Save these instructions for future reference on operation and maintenance.
· Danger of battery explosion from sparking.
· Danger of electric shock.
· Install the product in a heatproof environment. Ensure therefore that there are no chemicals, plastic parts, curtains or other textiles, etc. in the immediate vicinity of the equipment.
· The product is not allowed to be mounted in a user accessible area.
· Ensure that the equipment is used under the correct operating conditions. Never operate it in a wet environment.
· Never use the product at sites where gas or dust explosions could occur.
· Ensure that there is always sufficient free space around the product for ventilation.
· Refer to the specifications provided by the manufacturer of the battery to ensure that the battery is suitable for use with this product. The battery manufacturer’s safety instructions should always be observed.
· Protect the solar modules from incident light during installation, e.g. cover them.
· Never touch uninsulated cable ends.
· Use only insulated tools.
· This product is designed and tested in accordance with international standards. The equipment should be used for the designated application only.
· Connections must always be made in the sequence described in the Installation [10] chapter of this manual.
· The installer of the product must provide a means for cable strain relief to prevent the transmission of stress to the connections.
· In addition to this manual, the system operation or service manual must include a battery maintenance manual applicable to the type of batteries used.
1.2. Wiring safety precautions
· Use flexible multi-stranded copper cable for the battery and PV connections.
· The diameter of the individual strand of the cable used should not exceed 0.4mm (0.016 inch) or have a surface area exceeding 0.125mm² (AWG26).
· The maximum operating temperature is 90°C (194°F).
· A 25mm² cable, for example, should have at least 196 strands (class 5 or higher stranding according to VDE 0295, IEC 60228 and BS6360). An AWG2 gauge cable should have at least 259/26 stranding (259 strands of AWG26). Example of suitable cable: class 5 “Tri-rated” cable (it has three approvals: American (UL), Canadian (CSA) and British (BS)).
· In case of thicker strands the contact area will be too small and the resulting high contact resistance will cause severe overheating, eventually resulting in fire. See below figure for examples of what cable to use and not to use.

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Safety precautions

MPPT solar charger manual

1.3. Symbols used on the enclosure
The following symbols are used on the solar charger enclosure:

Symbol Name

Meaning

Danger of electric shock warning

Do not touch the electric connections, there is danger of electrical shock.

Hot surface warning

Do not touch the surface of the appliance, while it is running, it will get hot.

Read the manual instruction Ingress protection value
Ground symbol

Read the product manual before installation and use.
IP43 – The electronic components are protected from tools and small wires greater than 1 millimetre and protected from water spray less than 60 degrees from vertical.
Indicates the position of the chassis ground connection

1.4. SmartSolar MPPT 150/35 FCC and Industry Canada Compliance
This device complies with part 15 of the FCC Rules and to RSS of Industry Canada.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes : (1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. Operation of this equipment in a residential area may cause radio interference, in which case the user may be required to take adequate measures. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
· Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and receiver.
· Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
· Consult the dealer or an experienced radio/TV technician for help.
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de Classe A est conforme à la norme Canadienne ICES-003.

Safety precautions

MPPT solar charger manual
This device contains a transmitter with FCC ID: SH6MDBT42Q. This device contains a transmitter with IC: 8017A-MDBT42Q. To comply with FCC and Industry Canada RF radiation exposure limits for general population, the antenna(s) used for this transmitter must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times and must not be co-located or operating in conjunction with any other antenna or transmitter.
1.5. SmartSolar MPPT 150/45 FCC and Industry Canada Compliance
This device complies with part 15 of the FCC Rules and to RSS of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes : (1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and receiver.
· Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
· Consult the dealer or an experienced radio/TV technician for help.
This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de Classe B est conforme à la norme Canadienne ICES-003. This device contains a transmitter with FCC ID: SH6MDBT42Q. This device contains a transmitter with IC: 8017A-MDBT42Q. To comply with FCC and Industry Canada RF radiation exposure limits for general population, the antenna(s) used for this transmitter must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times and must not be co-located or operating in conjunction with any other antenna or transmitter.

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Safety precautions

MPPT solar charger manual

Introduction

The Victron Energy SmartSolar charge controller is an ultra fast Maximum Power Point Tracking (MPPT) solar charger with an outstanding conversion efficiency and is suitable for a wide range of battery and PV voltages.

2.1. Battery voltage, PV voltage and current rating
The solar charger can charge a lower nominal-voltage battery from a higher nominal voltage PV array. The controller will automatically adjust to the battery voltage and will charge the battery with a current up to its rated current.
The product name of the solar charger incorporates the maximum PV voltage and the maximum battery charge current.
For example: A 150/45 model has a maximum PV voltage of 150V and can charge the battery with a maximum of 45A.
The table below indicates the maximum PV voltage and maximum battery charge current of the solar chargers that are covered by this manual:

Solar charger model MPPT 150/35 MPPT 150/45

Maximum PV voltage 150V 150V

Maximum battery charge current 35A 45A

Suitable battery voltages 12, 24, 36 and 48V 12, 24, 36 and 48V

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Introduction

MPPT solar charger manual
3. Features
3.1. Automatic battery voltage detection
The solar charger automatically detects supported (e.g 12V, or 24V, or 48V) system voltage (battery voltage) on first power up. If a different system voltage is required at a later stage, or if the solar charger is connected to a 36V system, this can be manually configured in the solar charger settings.
3.2. Outstanding MPPT algorithm
Ultra fast MPP tracking The solar charger contains an ultra fast MPPT controller. This is especially beneficial when the solar light intensity is constantly changing, as is the case during cloudy weather. Because of the ultra fast MPPT controller, 30% more energy is harvested compared to solar chargers with a PWM controller and up to 10% more compared to slower MPPT controllers. Optimal solar yield The solar charger has an innovative tracking algorithm. It will always maximize energy harvest by locking to the optimum MPP (Maximum Power Point). If partial shading occurs, two or more maximum power points may be present on the power-voltage curve. Conventional MPPTs tend to lock to a local MPP, which may not be the optimum MPP.
3.3. Outstanding conversion efficiency
The solar charger has an outstanding conversion efficiency. The maximum efficiency exceeds 98%. One of the benefits of the high efficiency is that the solar charger does not have a cooling fan and the maximum output current is guaranteed up to an ambient temperature of 40°C (104°F).
3.4. Extensive electronic protection
The solar charger is protected against over-temperature. The output is fully rated up to an ambient temperature of 40°C (104°F). Should the temperature further increase, the output current will be derated. The solar charger is equipped with PV reverse polarity protection and PV reverse current protection.
3.5. VictronConnect app
The VictronConnect app can be used to: · Monitor the solar charger and view real-time solar and battery data. · Operate solar charger features. · Access up to 30 days of historical data and error history. · Configure solar charger settings. · Update firmware.

Screenshot of the VictronConnect app, showing real-time data and historical data. The VictronConnect app can be downloaded from app stores or from the Victron Energy downloads page.
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Features

MPPT solar charger manual
The app is available for the following platforms: · Android. · Apple iOS, note that USB is not supported, it is only possible to connect via Bluetooth. · MacOs. · Windows, note that Bluetooth is not supported, it is only possible to connect via USB.
The app can connect to the solar charger in the following ways: · Directly via its built-in Bluetooth. · Via Bluetooth, using an optional VE.Direct Bluetooth Smart Dongle. · Via USB, using an optional VE.Direct USB interface. · Via internet or LAN, through the VRM portal, using an optional GX device or GlobalLink 520.

Connection via Bluetooth.

Connection via USB.

Connection via Internet or LAN.
3.6. Display
There are a number of display options: · The VictronConnect app. · A GX device. · The VRM Portal, note that a GX device or a GlobalLink 520 is needed. · The MPPT Control – an (optional) external display that connects to the VE.Direct port. Note that the required VE.Direct cable is
not included with the MPPT Control.

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Features

MPPT solar charger manual

3.7. VE.Direct port
The VE.Direct port is used to communicate with the solar charger. It can be used for several purposes: · To connect to a monitoring device, such as a GX device or the GlobalLink.
· To connect with the VictronConnect app.
· For external control.
Special cables or interfaces are needed to connect to this port: · VE.Direct cable – used to connect to a GX device or the GlobalLink.
· VE.Direct to USB interface – used to connect via USB to the VictronConnect app.
· VE.Direct Bluetooth Smart dongle – used to connect via Bluetooth to the VictronConnect app.
· VE.Direct TX digital output cable – used for streetlight control or to create a virtual load output.
· VE.Direct non inverting remote on/off cable – used to remotely switch the solar charger on or off.

Load output
The solar charger is equipped with a virtual load output.
3.8.1. Virtual load output
A virtual load output can be established to compensate for the absence of a physical load output in the solar charger. To create a virtual load output: · Use the VE.Direct TX cable and enable it to act as a virtual load output via the VictronConnect App RX port function. Refer to
the RX port settings [27] chapter.
The virtual load output can be set up within the VictronConnect app and controlled using battery voltages or the BatteryLife algorithm. For details on the configuration process, please consult the Load output settings [22] chapter.
3.8.2. BatteryLife
This chapter only applies if the virtual load output is used. When the solar charger is not able to recharge the battery to its full capacity within one day, the result is often that the battery will continually be cycled between a partially charged’ state and theend of discharge’ state. This mode of operation (no regular full recharge) will destroy a lead-acid battery within weeks or months. The BatteryLife algorithm will monitor the state of charge of the battery and, if needed, day by day slightly increase the load disconnect level (i.e. disconnect the load earlier) until the harvested solar energy is sufficient to recharge the battery to nearly the full 100%. From that point onward, the load disconnect level will be modulated so that a nearly 100% recharge is achieved about once every week.

Battery charging
3.9.1. Adaptive 3-stage battery charging
The solar charger is a 3-stage charger. The charge stages are: Bulk ­ Absorption ­ Float. Bulk During the bulk stage, the solar charger delivers the maximum charge current, to rapidly charge the batteries. During this stage, the battery voltage will slowly increase. Once the battery voltage has reached the set absorption voltage, the bulk stage stops and the absorption stage commences. Absorption During the absorption stage, the solar charger has switched to constant voltage mode. The current flowing to the battery will gradually decrease. Once the current has dropped below 2A (tail current), the absorption stage stops and the float stage will commence. When only shallow discharges occur the absorption time is kept short. This is to prevent overcharging of the battery. But if the battery was deeply discharged, the absorption time is automatically increased, to make sure that the battery is fully recharged. Float During the float stage, the voltage is reduced, and the battery’s fully charged state is maintained.

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Features

MPPT solar charger manual
A storage stage is not needed for solar chargers, unlike for AC chargers, since at night there is no solar power, so battery charging will stop.
3.9.2. Flexible charge algorithm
The VictronConnect app allows selection of 8 pre-set charge algorithms, or alternatively the charge algorithm is fully programmable. The charge voltages, stage duration and the charge current can be customized. In addition to this, 8 pre-programmed algorithms can be set with a rotary switch.

Equalization charging
Some lead-acid battery types need a periodic equalization charge. During equalization the charge voltage will be increased above the regular charge voltages to achieve cell balancing. If an equalization charge is required it can be enabled using the VictronConnect app.

Temperature sensing
Temperature sensing allows for temperature compensated charging. The absorption and float charge voltages are adjusted based on either the battery temperature (accessory needed) or otherwise on the solar charger internal temperature. Temperature compensated battery charging is needed when charging lead-acid batteries in hot or cold environments. The temperature compensation can be enabled or disabled in the solar charger settings and the amount of compensation, the compensation coefficient (mV/°C), is adjustable.

Internal temperature sensor
The solar charger has a built-in internal temperature sensor. The internal temperature is used to set the temperature compensated charge voltages. For this, the internal temperature when the solar charger is “cold” is used. The solar charger is “cold” when there is only little current flowing into the battery. Be aware that this is only an estimation of the ambient and the battery temperature. Should a more accurate battery temperate be needed, consider using an external battery temperature sensor, see chapter External temperature and voltage sensor [8]. The temperature compensation range is 6°C to 40°C (39°F to 104°F). The internal temperature sensor is also used to determine if the solar charger is overheated.

External temperature and voltage sensor
The (optional) Smart Battery Sense is a wireless battery voltage and temperature sensor and can be used with the solar charger. It measures the battery temperature and the battery voltage and sends this via Bluetooth to the solar charger. The solar charger uses the Smart Battery Sense measurements for: · Temperature compensated charging using the actual battery temperature, rather than the solar charger’s internal temperature.
An accurate battery temperature measurement will improve charging efficiency and prolong the life of lead-acid batteries.
· Voltage compensation. The charge voltage is increased to compensate in case there is a voltage drop over the battery cables during high current charging.
The solar charger communicates with the Smart Battery Sense via Bluetooth using a VE.Smart Network. For more detail on the VE.Smart network see the VE.Smart Networking manual. Alternatively, a VE.Smart Network that measures battery temperature and battery voltage, can also be set up between a solar charger and a BMV-712 Smart or SmartShunt battery monitor that has been equipped with a Temperature sensor for BMV, without the need for a Smart Battery Sense.
Note that a VE.Smart Network can only be set up if the solar charger is capable of Bluetooth communication, has Bluetooth enabled or is equipped with a VE.Direct Bluetooth Smart dongle.

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Features

MPPT solar charger manual

Example of a VE.Smart Network of a Smart Battery Sense and a solar charger.
3.11. Voltage sensing
An optional Smart Battery Sense or battery monitor measures the battery terminal voltage and sends this via Bluetooth using the VE.Smart [29] network to the solar charger. If the battery voltage is less than the solar charge voltage, the solar charger will increase its charge voltage to compensate for voltage losses.
3.12. Remote on/off
A virtual remote on/off terminal can be created by using the (optional) VE.Direct non inverting remote on/off cable.
3.13. WireBox
The optional MPPT WireBox is a plastic cover that can be attached to the bottom of the solar charger. It covers the battery and solar terminals, preventing accidental or inquisitive contact with the battery and PV terminals. It provides an extra level of safety, and is particularly useful if the solar charger is installed in a general access area. For more information and to find the right MPPT WireBox for your solar charger see the MPPT WireBox product page: · MPPT WireBox-MC4 · MPPT WireBox-Tr
Example of a solar charger with MPPT WireBox

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Features

MPPT solar charger manual

4. Installation

The DC (PV) input is not isolated from the battery circuit. Therefore the PV, battery and control circuit are considered hazardous and should not be user accessible.
For proper temperature compensated battery charging the ambient temperature of the solar charger and the battery must be within 5°C (9°F).
The battery and PV connections must be guarded against inadvertent contact. Install the solar charger in an enclosure or install the optional WireBox [9].

4.1. Mounting
Mount the solar charger vertically on a non-flammable substrate, with the electrical terminals facing downwards.
The Dimension drawings [60] chapter of this manual contains the dimension drawing of the solar charger, this drawing also indicates the mounting holes.
Observe a minimum clearance of 10cm under and above the solar charger for optimal cooling.
Mount the solar charger close to the battery, but never directly above the battery. This is to prevent damage due to gassing of the battery.
Avoid ambient temperature differences of more than 5°C between the solar charger and the battery. These temperature differences can lead to incorrect temperature compensated charging, which can reduce the battery lifetime.
If large temperature differences or extreme ambient temperature conditions are expected, use a direct battery temperature sense source like the Smart Battery Sense or a BMV or SmartShunt equipped with a temperature sensor.
If the optional MPPT WireBox is used:
· Affix the steel WireBox base to the solar charger before the solar charger is mounted into its final position.
· For full mounting instructions, see the MPPT WireBox TR quick installation guide.

4.2. Battery
The battery supply must be protected by a fuse as per the below table.

Solar charger type MPPT 150/35 MPPT 150/45

Minimum battery fuse rating 40A 50A

Maximum battery fuse rating 45A 63A

For Canada the battery fuse must comply with the C22.2 standards.

The battery installation must be done in accordance with the local storage battery rules. For Canada this is the Canadian Electrical Code, Part I.
Use flexible multi stranded copper cable for the battery connections Also see chapter Wiring safety precautions [1].
4.3. PV array
The solar charger can be used with a PV configuration that satisfies both these two conditions: · The maximum open circuit PV voltage can not exceed 150V. · The nominal PV voltage should be at least 5V higher than the battery voltage. The PV array can consist of mono- or poly-crystalline panels.

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MPPT solar charger manual

The solar panels are connected in series, in parallel or in series/parallel. See below figure for examples of these configurations.

120 W 12 V

120 W 12 V

120 W 12 V

120 W 12 V

120 W 12 V

120 W 12 V

120 W 12 V

120 W 12 V

240 W 24 V 10 A

240 W 12 V 20 A
Examples of series, parallel and series/parallel solar arrays.

480 W 24 V 20 A

To help calculate the size of the PV array configuration use the MPPT sizing calculator. Alternatively, use one of these PV array configurations: PV array example 24V battery with 150V solar charger: · Minimum number of cells in series: 72 (2x 12V panel in series or 1x 24V panel). · Recommended number of cells for highest controller efficiency: 144 cells (4x 12V panel or 2x 24V panel in series). · Maximum: 216 cells (6x 12V or 3x 24V panel in series). PV array example 48V battery with 150V solar charger: · Minimum number of cells in series: 144 (4x 12V panel or 2x 24V panel in series). · Maximum: 216 cells (6x 12V or 3x 24V panel in series).

· Provide a means to disconnect all current-carrying conductors of a photo- voltaic power source from all other conductors in a building or other structure.
· Careful: when calculating the number of panels that can be used in series, make sure to take both its Open circuit voltage (Voc) and its Temperature coefficient into account. At ambient temperatures below 25°C, the Voc will be higher.
· A switch, circuit breaker, or other device, either AC or DC, shall not be installed in a grounded conductor if operation of that switch, circuit breaker, or other device leaves the grounded conductor in an un-grounded state while the system remains energized.
· Do not use solar panels with optimizers. In worst case, the use of optimizers will cause irreparable damage to the solar charger.
· Use flexible multi stranded copper cable for the screw connections . See chapter Wiring safety precautions [1].

4.4. Grounding
Battery grounding The solar charger can be installed in a positive or in a negative grounded system. Apply a single ground connection, preferably close to the battery, to prevent system issues or ground loops. PV array grounding The positive and negative of the PV array should not be grounded. Ground the frame of the PV panels to reduce the impact of lightning. Do not connect the solar charger to a grounded PV array. Only one ground connection is allowed, and this should be near the battery.

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Ground fault detection The solar charger does not have internal ground fault protection. The USA National Electrical Code (NEC) requires the use of an external ground fault protection device (GFPD). The system electrical negative should be bonded through a GFPD to earth ground at one (and only one) location.
When a ground fault is indicated, battery terminals and connected circuits may be un-grounded and hazardous.
4.5. Connection overview

ID

Description

A

Ground screw.

B

Battery screw terminals.

C

PV screw terminals.

D

VE.Direct socket.

E

LEDs.

F

Rotary switch.

4.6. Electrical connections
WARNING: Check the polarity before connecting the battery and PV voltage. WARNING: Follow the correct installation procedure described in this chapter. IMPORTANT: Torque the battery and PV connections at 1.6Nm.
Connection order electrical connections: 1. Connect the battery: allow the solar charger to automatically recognise the system voltage (wait 10 seconds). 2. It is recommended to verify system voltage: use VictronConnect or an external control display. 3. Connect the PV. 4. If applicable, connect the VE.Direct port. The correct connection order is necessary to allow the automatic system voltage detection to setup properly. It is only allowed to connect PV first when the system voltage is manually set before connecting the battery. Not following the correct procedures can disable or damage the charger and/or the installation. See the below figure on how the basic electrical connections are made:

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ID

Description

A

Solar charger.

B

Battery or battery bank, lead acid or lithium.

C

Solar panel or solar panel array.

D

DC loads.

DC fuse.

4.7. Connect the MPPT Control display
Connect the (optional) MPPT Control display to the VE.Direct port of the solar charger using a VE.Direct cable.
The VE.Direct cable is available in a variety of lengths and is not included with the MPPT control display. Note that it is not possible to extend the VE.Direct cable, the maximum length can not exceed 10 meters.
For more information, see the MPPT Control manual.

Connect the display to the solar charger via a VE.Direct cable

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5. Configuration and settings
The solar charger settings can be configured so it can be taylored specifically for the system it is used in.
Do not change solar charger settings unless you know what they are and what the effect of changing these settings is going to be. Incorrect settings may cause system problems including damage to batteries. When in doubt, seek advice from an experienced Victron Energy installer, dealer or distributor.
5.1. How to change settings
There are several methods that can be used to change these settings. Some of these allow all settings to be configured, but others might have limitations: · The VictronConnect app – All settings can be changed and the firmware can be updated. · The rotary switch – The charge algorithm for a number of pre-set battery types can be selected. · The MPPT Control display (optional) – Most settings can be changed.
Do not change solar charger settings unless you know what they are and what the effect of changing these settings can be. Incorrect settings may cause system problems including damage to batteries. When in doubt, seek advice from an experienced Victron Energy installer, dealer or distributor.
5.1.1. Settings via the VictronConnect app
The VictronConnect app can be used to change all solar charger settings and can be used to update the firmware. See the VictronConnect app [5] chapter for an overview of the different ways the VictronConnect app can connect to the solar charger. This manual only covers the VictronConnect app solar charger- specific items. For more general information on the VictronConnect app, like how to use it or how to connect, see the VictronConnect manual.

To access the solar charger settings, navigate to the settings page. Do this by clicking on the cog icon at the top right of the home screen. The settings page provides access to view and/or to change the solar charger settings. For information about each setting and how to update firmware see the Updating firmware [28] chapter.
5.1.2. Settings via the rotary switch
The rotary switch can be used to select eight pre-programmed battery charge algorithms.

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Configuration and settings

MPPT solar charger manual
Use a small flathead screwdriver to turn the rotary switch. The arrow indicates which setting number has been selected. The table below indicates the charge algorithm and charge settings for each rotary switch position.

Rotary switch set to position 2
Turning the rotary switch will override the charge settings including settings that were made with the VictronConnect app or with the display. Likewise, if charge settings are changed with the VictronConnect app or the display, this will override the rotary switch setting.

Configuration and settings

MPPT solar charger manual

Switch position
6
7

Suggested battery type

Absorption voltage* (V)

Float voltage*
(V)

Equalize* voltage (V)

Equalize** nominal current
percentage

Temperature compensation factor* (mV/°C)

PzS tubular

15.3

13.8

17.1

-16

plate traction batteries or

30.6

27.6

34.2

25%

-32

OPzS batteries

61.2

55.2

68.4

-64

Lithium Iron

14.2

13.5

0

Phosphate (LiFePo4)

28.4

27.0

n/a

n/a

0

batteries

56.8

54

0

• The top value is for 12V systems, the middle for 24V systems and the bottom for 48V systems. ** Equalize is by default disabled. To enable see chapter Battery settings [17]

A binary LED code helps determining the position of the rotary switch. After changing the position of the rotary switch, the LEDs will blink during 4 seconds as indicated in below table. Thereafter, normal indication resumes, as described in the LEDs section.

Switch position 0 1 2 3 4 5 6 7

Bulk LED 1 0 0 0 1 1 1 1

Absorption LED 1 0 1 1 0 0 1 1

Float LED 1 1 0 1 0 1 0 1

Blinking frequency Fast Slow Slow Slow Slow Slow Slow Slow

5.1.3. Settings via MPPT Control display
The optional MPPT Control display can be used to configure solar charger settings, with the exception of advanced settings such as RX and TX port settings. For information on how to do this see the MPPT Control manual.

The MPPT Control
5.2. All settings explained
This chapter lists all solar charger settings that are user-configurable and also explains how to update firmware of the solar charger.
Do not change settings unless you know what they are and what the effect of changing these settings will be. Incorrect settings may cause system problems including damage to batteries. When in doubt, seek advice from an experienced Victron Energy installer, dealer or distributor.

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Configuration and settings

5.2.1. Battery settings

MPPT solar charger manual

Battery voltage The battery voltage is automatically detected at the very first power-up of the solar charger and the battery voltage is set accordingly. Further automatic detection is disabled. To make sure that a stable measurement is used, the charger first waits 10 seconds, and thereafter takes an averaged measurement. Note that the solar charger will remain off during this time. In case the solar charger does not measure a battery voltage, it will default to 12V and store that. This will happen if the solar charger is powered via its PV terminals, while not connected to a battery. Note that the solar charger will not automatically detect a 36V battery. This will need to be set manually. After automatic detection has taken place, the battery voltage can be changed and set to 12, 24, 36 or 48V, if so required .
Tip: If the firmware of the solar charger needs to be updated, while keeping the automatic voltage detection active, for example before shipping the unit to an end-user, do the following: · Update the firmware.
· Once the firmware update is complete, go to the settings page in the VictronConnect app.
· On the settings page, click on the three vertical dots in the upper right corner and select “Reset to defaults” from the drop-down menu.
· Un-power the solar charger within 10 seconds.
The next time that the unit is powered up, it will perform the initial automatic voltage detection.
Max charge current This setting sets the maximum battery charge current. It is by default set to the maximum solar charge current. Use this setting to reduce the charge current, for example, when a smaller battery bank is used that requires a lower charge current. Charger enabled This setting enables or disables the battery charger. It is by default set to “enabled”. This setting can be used when work needs to be carried out on the installation. When this setting is disabled, the batteries will not be charged. Battery preset This setting sets the battery charge algorithm. It is by default set to “rotary switch”. A selection can be made between:

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· The rotary switch position. · Pre-defined factory battery presets. · User- defined battery presets. · Create, modify or delete a user-defined preset. This setting uses factory pre-defined presets for a large variety of battery types. These pre-defined charge algorithms are suitable for almost all installations. It is possible to also create user-defined battery presets. The chapter Customize battery charge algorithm [18] explains how to do this. These user-defined presets are stored in the VictronConnect app library. This is helpful in case multiple solar chargers need to be configured, eliminating the need to define the entire charge algorithm each time a new solar charger is configured. Expert mode This setting enables or disables expert mode. It is by default set to “disabled”.
The default charge algorithms work well for almost all installations. Only enable expert settings if your equipment has special requirements.
When this setting is enabled the following parameters can be configured: · Charger voltages: bulk, absorption and float. · Bulk: re-bulk voltage offset. · Absorption: duration, time and tail current. · Equalization: current, interval, stop mode and duration. · Temperature voltage compensation. · Low temperature cut off. For the meaning of these parameters see chapter Battery charge algorithm settings [20]. Equalization
Equalization can cause damage to the battery if the battery is not suitable for an equalization charge. Always check with the battery manufacturer prior to enabling equalization.
This setting can be used to disable or enable automatic equalization. When enabled, the number of days can be selected when equalization should repeat. A manual equalization can be initiated by pressing the “START NOW” button. Use the manual equalize option only during absorption and float charge stages, and when there is sufficient sunlight. The current and voltage limits are identical to the automatic equalize function. The manual equalization stage lasts 1 hour and can be stopped at any time by the Stop Equalize.
The equalization setting might not be active, this can be the case if the battery preset does not support an equalization charge which is the case with lithium batteries.
Customize battery charge algorithm This chapter explains how to modify a battery charge algorithm or to create, modify and delete user defined battery presets. See the Battery charge algorithm settings [20] chapter for the meaning of all charge algorithm parameters.

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Only experienced users should configure or edit user defined battery charge algorithms. A wrongly defined battery charge algorithm can lead to battery damage or create unsafe situations.
To Modify a basic battery charge algorithm: · Select a preset battery type that is the best match to your battery type. · Change one of the basic charge parameters that are listed on the settings screen. · Configure the required parameters. · The battery preset is now set to “user defined”. To Modify an expert battery charge algorithm · Enable “Expert” mode. · The basic and additional charge parameters are now listed on the screen. · Configure the required parameters. · The battery preset is now set to “user defined”. To create and save a custom battery type: · Select a preset battery type that is the best match to your battery type. · Change the charge parameters so they match your battery. This can be done either in normal mode or in expert mode. · The battery preset is now set to “user defined”. · Select in the “Battery preset” menu “Create preset”. · Give the preset battery a name. To load a custom battery type: · Select in the “Battery preset” menu “Select preset”. · The menu lists all factory preset and custom battery types that were previously added (if any). · Select the battery type of your choice. To modify (or delete) a custom battery type: · Select in the “Battery preset” menu “Edit presets” · Navigate to the battery you want to modify. It is not possible to modify a factory preset, only custom types can be modified (or
deleted). · Modify the charge parameters.

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· To save the settings press the “SAVE CHANGES” button at the bottom of the page. · To delete the battery, press the “REMOVE PRESET” button. Battery charge algorithm settings This chapter explains all parameters that are used in “Expert” mode and the settings that are used when programming a custom battery type via the battery preset menu.

Absorption voltage
This setting sets the absorption voltage.
Adaptive absorption time
This setting enables or disables the adaptive absorption time.
· When disabled: The length of the absorption stage is the same each day, the length is determined by the “Maximum absorption time” setting, provided there is enough solar power. Be aware that this option can potentially result in overcharging your batteries, especially for lead batteries and if only shallow daily discharges take place. Check with the battery manufacturer for the recommended maximum absorption time. The only condition that can end the absorption time before the maximum time has been reached, is the “tail current” setting. If the absorption time always needs to be the same length, then disable the “Tail current” setting. See more information on the tail current setting further down in this chapter.
· When enabled: The length of the absorption stage is different each day, it adapts itself to the state of charge of the battery in the morning at the beginning of the charge cycle. The maximum “adaptive” absorption time for the day is determined by the battery voltage as measured just before the solar charger begins operation each morning.

Multiplier

x 1

x 2/3

x 1/3

x 1/6

Adaptive absorption time *

6:00 hours

4:00 hours

2:00 hours

1:00 hour

12V system

Vbatt < 11.9V

11.9V < Vbatt < 12.2V

12.2V < Vbatt < 12.6V

Vbatt > 12.6V

24V system

Vbatt < 23.8

23.8 < Vbatt < 24.2V

24.2V < Vbatt < 25.2V

Vbatt > 25.2V

48V system

Vbatt < 47.6

47.6V < Vbatt < 48.8V

48.8V < Vbatt < 50.4V

Vbatt > 50.4

*) The adaptive absorption time is calculated by the multiplier times the “Maximum absorption time” setting. The adaptive absorption times in this table are based on the 6 hour default “Maximum absorption time” setting.

Maximum absorption time This setting sets the absorption time limit. This setting is only available when programming a custom charge profile.

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Enter the maximum time in hours and minutes (hh:mm) the solar charger is allowed to spend in the absorption stage. The maximum time that can be set is 12 hours and 59 minutes.
Float voltage
This setting sets the float voltage.
Re-bulk voltage offset
This setting sets the re-bulk voltage offset. This offset voltage is used to determine when a charge stage stops and the bulk stage starts again, i.e. the charge cycle resets and starts at the first charge stage again.
The re-bulk voltage is calculated by adding the re-bulk voltage offset to the lowest voltage setting (normally this is the float stage).
An example: If the re-bulk offset is set at 0.1V and the float voltage at 13.8V, the charge cycle will restart once the battery voltage drops below 13.7V (13.8 minus 0.1) for one minute.
Equalization voltage
This setting set the equalization voltage.
Equalization current percentage
This setting sets the percentage of the “maximum charge current” setting that will be used to calculate the equalization charge current.
For example: If the “maximum charge current” setting is set at 10A and the “Equalization current percentage” setting is set to 10%, the Equalization current will be 1A (10% of 10A).
Automatic equalization
This setting sets the repeat interval when the equalization stage should take place. This can be set between 1 and 250 days. Setting to 1 means a daily equalization, 2 means every other day and so on.
An equalization stage is typically used to balance the cells and also to prevent stratification of the electrolyte in flooded lead-acid batteries. If equalization is needed or not depends on the type of battery if (automatic) equalization is needed and under what conditions. Check with the battery supplier to find out if equalization is needed for the battery.
During the equalization stage, the charge voltage increases up to the set “Equalization voltage”. This is maintained as long as the charge current stays below the “equalization current percentage” setting of the “Maximum current” setting.
Duration of the Automatic equalization cycle:
· For all VRLA battery presets and for some flooded battery presets, the automatic equalization stage ends when the voltage limit (maxV) has been reached.
· For the lithium battery preset, equalization is not available.
· When an automatic equalization stage has not been completed within one day, it will not resume the next day. The next equalization surge will take place according to the interval as set in the “Auto Equalization” setting.
Equalisation stop mode
This setting determines when the equalisation stage should end:
· Automatic: Equalization stops if the battery voltage has reached the equalisation voltage.
· Fixed time: Equalization stops when the time has reached the time as set in the “Maximum equalization duration” setting.
Maximum equalization duration
This setting sets the maximum time that the equalization stage will last.
Manual equalization
Use this to perform a “once-off” equalization. Once the “start now” button is pressed, a one-hour equalization cycle will be performed, alternatively, the equalization stage can be stopped manually.
Tail current
This setting sets the current threshold to end the absorption stage before the maximum absorption time has been reached. If the charge current drops below the set tail current, for one minute, the absorption stage will end and the float stage will start. This setting can be disabled by setting it to zero.
Temperature compensation
This setting sets the temperature compensation coefficient that is needed for temperature compensated charging.
Many battery types require a lower charge voltage in warm operating conditions and a higher charge voltage in cold operating conditions. The configured coefficient is in mV per degree Celsius for the whole battery bank, not per cell. The base temperature for the compensation is 25°C (77°F).

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The chart below indicates the absorption and float charge voltage behaviour at different temperatures. The graph displays the temperature compensation for a 12V system and uses a -16mV/°C temperature compensation coefficient. For a 48V system multiply by 4.

Temperature compensated charge graph
By default, the solar charger uses its internal temperature for battery temperature compensated charging. An internal temperature reading is taken in the morning and then again when the e solar charger has been idle for at least one hour, for example when the charger is not actively charging a battery or supplying a load.
When the solar charger is part of VE.Smart Networking and receives a battery temperature reading from a Battery Sense or a battery monitor with a temperature sensor, the actual battery temperature will be used for temperature compensated charging throughout the day.
Low temperature cut-off
This setting is used to prevent damage to a lithium battery by disabling charging at low temperatures.
The “Low temperature cut-off” feature is only active when the solar charger is part of a VE.Smart network and is receiving a battery temperature reading from a Battery Sense or a battery monitor with temperature sensor.
The “low temperature cut-off” setting is by default disabled. When enabled, a low cut off temperature can be set. The default temperature is 5°C, this is a suitable temperature setting for lithium iron phosphate (LFP) batteries. However, always check with the lithium battery supplier to find out what this temperature should be set at.
The “low temperature cut-off” mechanism will stop battery charging when the battery temperature has dropped below the low temperature cut-off setting. Battery charging will resume once the battery temperature has risen 0.5°C above the low temperature cut-off setting.
Note that setting “low temperature cut-off” is not needed for Victron Lithium Smart batteries or for Victron Super Pack batteries with serial number HQ2040 and above. This setting is only needed for lithim batteries that are unable to block charging when the temperature drops too low.
5.2.2. Load output settings
The load output settings used to control the VE.Direct TX port [26] or the , enabling it to operate a BatteryProtect, a relay or another load-shedding device. For more information, see the chapter TX port settings [26].

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The available operation modes are: · BatteryLife (default setting):
This algorithm is self-adapting and aims to maximise the battery’s lifespan. For a detailed explanation of its functionality, please refer to the BatteryLife [7] chapter for a description of its functionality.
· Conventional algorithm 1: 12V system: OFF when Vbatt < 11.1V, ON when Vbatt

13.1V. 24V system: OFF when Vbatt < 22.2V, ON when Vbatt > 26.2V. 48V system: OFF when Vbatt < 44.4V, ON when Vbatt > 52.4V.
· Conventional algorithm 2: 12V system: OFF when Vbatt < 11.8V, ON when Vbatt 14.0V. 24V system: OFF when Vbatt < 23.6V, ON when Vbatt > 28.0V. 48V system: OFF when Vbatt < 47.4V, ON when Vbatt > 56.0V.
· Always off: The load output is always OFF.
· Always on: The load output is always ON.
· User defined algorithm 1: OFF when Vbatt < Vlow. ON when Vbatt > Vhigh.
· User defined algorithm 2: OFF when Vbatt < Vlow or Vbatt > Vhigh. ON when Vbatt is between Vlow and Vhigh.
The “always off” and the “always on” modes will respond immediately. The other modes have a 2-minute delay before the load output changes. This is so that the solar charger does not respond too quickly when, for example, an inrush current briefly lowers the battery voltage below the threshold.
The load output settings also control the streetlight [23] algorithm. Both work together to protect the battery from being too deeply drained. The streetlight settings are overridden should the battery voltage falls below the load disconnect voltage. When the battery voltage increases to the load reconnect voltage, the streetlight function will resume.
5.2.3. Streetlight settings
The streetlight function enables the solar charger to automatically control night lighting. It will automatically determine when the light should be on or off and can control the light intensity.

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When the streetlight function is enabled a timer program can be created whereby Sunset, Sunrise as well as Midnight can be used as anchor points for the timer program. These anchor points will automatically adjust depending on length of the night as this changes with the seasons.

Streetlight control
The solar charger controls the streetlight:
· Via the TX port together with a VE.Direct TX digital output cable. Also see the TX port settings [26] chapter for more details.
The streetlight algorithm is always applied in conjunction with the settings as configured in the Load output menu:
· If the streetlight is disabled, then the (virtual) load output is controlled only by the configuration as made in the load output menu.
· If streetlight is enabled, then it’s an AND function: the load output will be on when both the conditions made in the Load output menu are satisfied as well as the streetlight settings. Otherwise, it’s off.
Make sure that load output setting is set to “Always on” or to “BatteryLife”. Do not set it to “Always off” as this will result in the light being always off.
For more configurable voltage levels to force the light off, the other load output options can also be used.
Setting the Sunset action
At sunset you can choose any of the following actions:
· Keep the lights off
· Switch on for a fixed time: This option will turn the light on at sunset, and then off again after a configurable interval. When the dimming feature is enabled1 (1), two dim-levels can be entered: one for the “on” period; and a second for the “off” period. A typical use case for these options is to get a strong light during high traffic hours (right after sunset), and lower intensity during the low hours, to save the battery. Set the second dim level to 0% to switch the light completely off during that second section.
· Switch on till midnight: This option turns the light on at sunset, and then off again at midnight. When the dimming feature is enabled1, two dim-levels can be entered: one for the “on” period (up to midnight) and a second dim- level for the “off” period after midnight. Set the second dim level to 0% to switch the light completely off during that second section.
· Switch on till sunrise: This options turns the light on at sunset, and then off again at sunrise. When this option is selected; there is no need to also select an action at sunrise, so the sunrise control option is not needed. When the dimming feature is enabled1, only one dim level can be configured, the dim level at sunset.

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1. The dimming feature requires the TX Port function to be configured to one of the “Light dimming” settings. This so the TX port outputs a PWM signal that can be used to dim the light. If the TX port function has not been set to one of the “Light dimming” settings, the dimming options will not appear in the sunset settings menu. Also see the TX port settings [26] chapter.
   Setting the Sunrise action
   At sunrise you can choose to:
   · Switch off: Turns the light off at sunrise.
   · Switch on before sunrise: This option switches the light on at a configurable time interval before sunrise, and then switches the light off at sunrise. In case the dimming feature is enabled1 an interval of more intense light can be configured during early morning rush hour. Together with the Sunset action, you can now configure three dim levels: one for the sunset rush hours, one during the low traffic hours, and the third for the early morning rush hours.
   Midnight
   The charger has no real time clock, and therefore does not know when it is 12 o’clock at night. All references to midnight refer to what we call solar midnight, this is the mid-point between sunset and sunrise.
   Midnight and Sunrise synchronisation
   The solar charger needs to have its internal clock synchronised with the solar cycle so it can set the solar midnight and sunrise anchor points in the timer program.
   After the streetlight settings have been programmed and the solar charger is powered up, the solar charger will start unsynchronised. It will first assume that midnight is 6 hours after sunset, and that the full night last for 12 hours.
   Once in operation, the solar charger will check the time between each detected sunrise. After three full day/night cycles, where the detected time is approximately 24 hours (one hour of deviation is allowed), it will start using its internal clock, instead of the fixed 6 and 12 hour timing.
   A loss of power (no battery power together with no PV power) will cause the solar charger to loose its synchronisation. It will take 5 days before it is re-synchronised. Note that the streetlight configuration settings and all other settings will never be lost, they are stored in a non-volatile memory.
   Sunset and sunrise detection
   The sunset and sunrise detection voltage settings can be used to adjust the detection to match the panel configuration. The sunrise detection voltage must be 0.5V higher than the sunset detection level. The lowest detectable voltage is 11.4V. Set this option to 0 to use the built-in defaults, which are:
   · Sunset = Vpanel < 11.4V.
   · Sunrise = Vpanel > 11.9V.
   The default setting is 0, which uses built-in default voltages.
   Use the “Delay” periods to avoid the system making an accidental switch when clouds pass over the panels. The valid range is between 0 and 60 minutes. The “Delays” are disabled by default (0).
   Gradual dimming speed
   The gradual dimming option can be used to slow down the response of the timer program. This is useful when multiple streetlights are used in a row. This helps to mask the fact that each timer uses its own detection and will have a transition moment which will vary from unit to unit.
   The dimming settings can be adjusted. You can input the number of seconds required to achieve each percentage-point of change (x seconds/per 1% of dimming). A number from 0 to 100 can be entered. Two examples:
   · 0 = immediate response (gradual dimming disabled): A setting of 0 will achieve an immediate response, this effective means that the gradual dimming option is disabled.
   · 9 = dim from 0 to 100% in 15 minutes: Setting the dimming speed to 9, for example, slows down the dimming speed to 15 minutes (9 seconds for each percentage point of dimming x 100 percentage points = 900 seconds = 15 minutes.
   Make sure that the TX port function is set to “Light dimming” mode (as described in point 1 at the beginning of this chapter) and connect a VE.Direct TX digital output cable to the PWM dim input of your LED driver.
   Mid-point shift

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The time of midnight is estimated based on solar activity, and depends on your geographical location. Daylight saving times can cause a further deviation between the “solar” and the “clock” midnight. The Mid-point shift function will compensate for these differences. Use 0 to disable the shift (default).
The Mid-point shift setting is only relevant when your streetlight setting program uses “Midnight” as a switching moment.
Calculation Example: For calculation we use a day of 1440 minutes, where Sunset is at 19:00 (1140 minutes) and Sunrise is at 6:25 (385 minutes): · The night duration in minutes is: 1440m(min/day) -1140m(time to sunset) + 385m(time to sunrise) = 685m. · The degree of shift = time of sunset(minutes)

• half the duration of night(minutes) – length of day(minutes) = 1140m + 342m – 1440m =
  42 minutes. Example configuration

The selections which have been made on above screen image results in this program: · At sunset – the light will be switched on for a fixed time. · Dim level at sunset – at Full brightness (100%). · Keep lights on during – the duration has been set to 1h 0m. · Dim level at end – at the end of one hour the brilliance will be reduced to half (50%). Also: · At sunrise – the lighting will be adjusted before sunrise. · Time before sunrise – at 1h 0m before sunrise, the following adjustment will be made: · Dim level – full brilliance will be restored (100%).
5.2.4. TX port settings
The VE.Direct-TX port can be used to send a signal to an external device. For example, to send a PWM signal to dim a streetlight. To use the TX port, a VE.Direct TX digital output cable is needed.

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The functionality of the TX port can be set at:
· Normal communication: This is the default setting. Use this function when connecting to a GX device, a VE.Direct Bluetooth Smart dongle, or any other device that needs to communicate with the solar charger via the VE.Direct port.
· Pulse every 0.01 kWh: Use this function in combination with an energy meter. The TX port will emit a pulse each time an additional 0.01kWh of energy has been harvested. The TX port is normally high and will be driven low for approximately 250ms for every 0.01kWh harvested.
· Light dimming (PWM normal): Use this function in combination with the “Streetlight” setting. The TX port PWM signal will be at 100% duty cycle when full light intensity is required.
· Light dimming (PWM inverted): Use this function in combination with the “Streetlight” setting. The TX port PWM signal will be at 0% duty cycle when full light intensity is required.
· Virtual load output: Use this function to create a virtual load output if the solar charger does not have a physical load output. The TX port will switch using the same conditions as set in the load output settings. Connect the VE.Direct TX digital output cable to a BatteryProtect module, a relay or directly to the remote on/off connector of the load*.
) The PWM signal is 5V, 160Hz.
**) The TX port is a logic 5V signal. It can drive a maximum of a 22kOhm impedance load, where the output voltage is dropped to 3.3V. Make sure that the connected load is within this specification.
Note that these functionalities (other than the first functionality) do not disable the ability of the unit to communicate. What happens is that the unit will automatically detect incoming data, and while data is being received, it will resume normal communication. Once the data reception has been completed, it will automatically return to its configured TX function.
For more in-depth “developer style” information on the VE.Direct port see the Data communication with Victron Energy products document.
5.2.5. RX port settings
The VE.Direct-RX port can be used to receive a signal from an external device. For example to switch the solar charger on (or off) from a signal sent by a battery management system (BMS).
To use the RX port for remote on/off control a VE.Direct non inverting remote on/off cable is needed.

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The functionality of the RX port can be set at: · Remote on/off:
This is the default setting. This functionality will switch the solar charger on or off via the RX pin. – RX pin to GND will switch the solar charger off. – RX pin floating or to battery positive will switch the solar charger on. · Load output on/off inverted: This setting reverses the load output on/off control: – RX pin 0V will switch load output on. – RX pin +5V will switch load output off. · Load output on/off normal: This setting allows load output on/off control: – RX pin 0V will switch the load output off. – RX pin +5V will switch load output on. For more in depth “developer style” information on the VE.Direct port see the Data communication with Victron Energy products Whitepaper.
5.3. Updating firmware
The firmware can be checked and updated with the VictronConnect app. The VictronConnect app might ask on the first connection to update the firmware. If this is the case, let it perform a firmware update. If it did not automatically update, check if the firmware is already up to date using the following procedure: · Connect to the solar charger.
· Click on the settings symbol .
· Click the options symbol . · Go to product info. · Check if you are running the latest firmware and look for the text: “This is the latest version”. · If the solar charger does not have the most up-to-date firmware, perform a firmware update.
5.4. Disabling and enabling Bluetooth
Bluetooth is by default enabled. It can be disabled or enabled via the VictronConnect app.

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To disable or enable Bluetooth: · Connect with the VictronConnect app to the solar charger. Note that if Bluetooth has been disabled, a connection via its built-in
Bluetooth is not possible anymore. In that case use the VE.Direct to USB interface, the VE.Direct Bluetooth Smart dongle or VRM to connect to the solar charger. · Select the solar charger from the VictronConnect list. · Navigate to the solar charger settings page by clicking the cog symbol in the top right hand corner. · Navigate to the product info page by clicking on the 3 dot symbol in the top right hand corner. · Enable or disable the Bluetooth setting. · In case of disabling Bluetooth, tick the checkbox confirming you understand that once Bluetooth has been disabled, a Bluetooth connection with the solar charger is not possible anymore.

5.5. VE.Smart Networking

Disabling or enabling Bluetooth

VE.Smart Networking allows a variety of products connected to the same network to share data via Bluetooth and is specially designed for smaller systems that do not have a GX device installed.
When this product is part of a VE.Smart Network, it can receive data or communicate with the following devices:

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· All SmartSolar solar chargers.
· All BlueSolar solar chargers connected to a VE.Direct Bluetooth Smart dongle.
· The Smart Battery Sense.
· A BMV or SmartShunt battery monitor equipped with Bluetooth (or VE.Direct Bluetooth Smart dongle) and an optional BMV temperature sensor.
· Certain Smart AC chargers.
· The SUN inverter.
For the product compatibility list see the VE.Smart manual located on the VictronConnect app product page. VE.Smart Networking can be used for: · Temperature sensing – the measured battery temperature is used by the chargers in the network for temperature compensated
charging and in case of lithium battery for the low temperature cut off.
· Battery voltage sensing – the measured battery voltage is used by the chargers in the network to to compensate the charge voltage should there be a voltage drop over the battery cables.
· Current sensing – The measured battery current is used by the charger so it knows the exact tail current at which the absorption stage should end and the float (or equalisation) stage should start. To measure the charge current all charge currents from all chargers are combined, or if a battery monitor is part of the network the actual battery current will be used.
· Synchronised charging – All chargers in the network will act as they were one large charger. One of the chargers in the network will assume a master role and the master will dictate the charge algorithm the other chargers will be using. All chargers will follow the same charge algorithm and charge stages. The master is selected randomly (not user settable) so it is important that all chargers use the same charge settings. During synchronised charging each charger will charge up to its own maximum charge current setting (it is not possible to set a maximum current for the whole network). For more information see the VE.Smart manual located on the VictronConnect app product page.
This video introduces the Smart Battery Sense and some features of VE.Smart Networking:

5.5.1. VE.Smart Networking setup
VE.Smart Networking design notes: There can only be one product in the network that transmits battery voltage and/or battery temperature. It is not possible to use a battery monitor together with a Smart Battery Sense, or multiple of these devices. For the network to be operational all networked devices must be within Bluetooth transmission distance of each other. A maximum of 10 devices can be joined into a VE.Smart Network. Some older devices might not support VE.Smart Networking. for more information see the Limitations chapter in the VE.Smart Networking manual. Setting up the network When setting up the network, first set up the Smart Battery Sense or battery monitor, and then add one or more solar chargers or AC chargers to the network. All solar chargers and AC chargers need to have the same charge settings. The easiest way to do this is to use a preset battery type or a saved used defined battery type. A warning #66 message will be shown if there is a difference between the devices charge settings. To set up a new network: · Open the VictronConnect app.
· Select one of the devices that needs to become part of the new VE.Smart network.
· Navigate to the settings page by clicking the gear symbol.
· click on “VE.Smart networking”.
· Click on “create network”.
· Enter a name for the new network.
· Click “save”.

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· Wait for confirmation that the network has been set up and click “OK”. · If more devices need to be added to this network go to next paragraph and join multiple devices to the network. To join another device to an existing network: · Open the VictronConnect app. Select a device that needs to become part of a VE.Direct network. · Navigate to the settings page by clicking the gear symbol. · Click on “VE.Smart Networking”. · Click on “join existing”. · Select the network the device needs to be joined to. · Wait for confirmation that the network has been set up and click “OK”. · Repeat above steps if more devices need to be added to the network. To leave a network: · Open the VictronConnect app. · Select a device that needs to be removed from the VE.Direct network. · Navigate to the settings page by clicking the gear symbol. · Click on “VE.Smart Networking”. · Click on “leave network”. Check the network Once the network has been set up all devices communicate with each other. The active LED on each connected device will now blink every 4 seconds. This is an indication that the device is actively communicating with the network. To check if an individual device is communicating with the network, click on the VE.Smart symbol in the main screen next to the solar dail. A pop- up window will open showing the connection status and the shared parameters.

VE.Smart Networking pop-up
To check if all devices are actively communicating with the same VE.Smart Networking, navigate to the settings page of one of the networked devices and click on “VE.Smart Networking”. A screen will be shown containing which device parameters of this device are shared and all the other devices that are connected to the same network are shown.

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Example of a VE.Smart Network More information For more information see the VE.Smart Networking manual.

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6. Operation

6.1. Start up
The solar charger will power up as soon as it has been connected to a battery and/or to a solar panel. As soon as the solar charger has been powered up, it can communicate via the VE.Direct port and Bluetooth. The solar charger’s data can be read out and setting configurations can be made using the VictronConnect or the optional display.
The solar charger will commence battery charging as soon as the PV voltage is 5V higher than the battery voltage. For charging to continue, the PV voltage must remain at least 1V higher than the battery voltage.

6.2. Battery charging
The charge controller will start a new charge cycle every morning, when the sun starts shining and when the PV voltage is 5V higher than the battery voltage.
Default method to determine length and end of absorption for Lead-acid batteries
The charging algorithm behaviour of solar chargers differ from AC connected battery chargers. Please read this section of the manual carefully to understand the solar charging behaviour, and always follow the recommendations of your battery manufacturer.
The voltage values mentioned in this chapter are for 12V systems, for 24V systems multiply by 2 and for 48V systems multiply by 4.

By default, the absorption time is determined on idle battery voltage at the start of each day based on the following table:

Battery voltage at start up < 11.9V
11.9V – 12.2V 12.2V – 12.6V

12.6V

Multiplier x 1
x 0.66 x 0.33 x 0.16

Maximum absorption time 6h 4h 2h 1h

The default absorption voltage is 14.4V and the default float voltage is 13.8V.
The absorption time counter starts once switched from bulk to absorption.
The MPPT solar chargers will also end absorption and switch to float when the battery current drops below a low current threshold limit, the “tail current”. The default tail current value is 2A.
The default settings (voltages, absorption time multiplier and tail current) can be modified with the VictronConnect app.
There are two exceptions to normal operation:
· When used in an ESS system; the solar charger algorithm is disabled; and instead it follows the curve as mandated by the inverter/charger.
· For CAN-bus Lithium batteries, like BYD, the battery tells the system, including the solar charger, what charge voltage to use. This Charge Voltage Limit (CVL) is for some batteries even dynamic; changes over time; based on for example maximum cell voltage in the pack and other parameters.
Variations to the expected charging behaviour
· Pausing of the absorption time counter: The absorption time counter starts when the configured absorption voltage is reached and pauses when the output voltage is below the configured absorption voltage. An example of when this voltage drop could occur is when PV power (due to clouds, trees, buildings) is insufficient to charge the battery and to power the loads.
· Restarting the charge process: The charging algorithm will reset if charging has stopped for an hour. This may occur when the PV voltage drops below the battery voltage due to bad weather, shade or similar.
· Battery being charged or discharged before solar charging begins: The automatic absorption time is based on the start-up battery voltage (see table). This absorption time estimation can be incorrect if there is an additional charge source (eg alternator) or load on the batteries. This is an inherent issue in the default algorithm. However, in most cases it is still better than a fixed absorption time regardless of other charge sources or battery state. It is possible to override the default absorption time algorithm by setting a fixed absorption time when programming

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the solar charge controller. Be aware this can result in overcharging your batteries. Please see your battery manufacturer for recommended settings.
· Absorption time determined by tail current:
In some applications it may be preferable to terminate absorption time based on tail current only. This can be achieved by increasing the default absorption time multiplier (warning: the tail current of lead-acid batteries does not decrease to zero when the batteries are fully charged, and this “remaining” tail current can increase substantially when the batteries age).
Default settings for LiFePO4 batteries
The default absorption voltage is to 14.2V (28.4V, 56.8V) and the absorption time is fixed and set to 2 hours. The float voltage is set at 13.5V (27V, 54V). Equalization is disabled. The tail current is set to 0A, this so that the full absorption time is available for cell balancing. The temperature compensation is disabled and the low temperature cut off is set to 5. These settings are the recommended settings for LiFePO4 batteries, but they can be adjusted if the battery manufacturer specifications advise otherwise.
Reset of the charge algorithm:
The default setting for restarting the charge cycle is Vbat < (Vfloat ­ 0.4 V) for lead-acid, and Vbat (Vfloat ­ 0.1 V) for LiFePO4 batteries, during 1 minute. These values are for 12 V batteries, multiply by two for 24V and by four for 48V.

6.3. Automatic equalization
Do not equalize charge Gel, AGM, VRLA or lithium batteries.
Equalization can cause damage to the battery if the battery is not suitable for an equalization charge. Always check with the battery manufacturer prior to enabling equalization.
Automatic equalization is by default disabled. When enabled, it can be configured with a number between 1 (every day) and 250 (once every 250 days).
When automatic equalization is active, the absorption charge will be followed by a voltage limited constant current period. The current is by default limited to 8% of the bulk current and can be adjusted between 0% and 100%. The bulk current is set by default to the maximum charge current the solar charger is capable of, unless a lower charge current has been chosen.
The maximum equalization duration is set by default to 1 hour and can be configured between 0 minutes and 24 hours. The automatic equalization will end when the voltage limit has been reached or when the set maximum equalization duration has been reached, whichever comes first.
When automatic equalization has not finished within a day, it will not resume the next day. The next equalization session will take place as determined by the day interval.

6.4. Lithium batteries
Lithium Iron Phosphate (LiFePo4) batteries do not need to be fully charged to prevent premature failure. The default lithium (and recommended) settings are:

Setting 12V system 24V system 48V system

Absorption voltage 14.2V 28.4V 56.8V

Absorption time 2h 2h 2h

Float voltage 13.2V 26.4V 52.8V

These settings are adjustable.

6.5. Shutdown and restart procedure
The solar charger is always active when the PV and/or the battery terminals are powered. The solar charger does not have an on/off switch.
To shut down the solar charger, perform these steps in the prescribed order:
1. Disconnect the PV supply to the solar charger by switching the PV supply off or by removing the external fuse(s) or circuit breaker(s).
2. Disconnect the battery supply to the solar charger by switching the battery supply off or by removing the exterenal fuse(s) or circuit breaker(s).
To restart the solar charger after it was shutdown, perform these steps in the prescribed order:
1. Connect the battery supply to the solar charger by switching the battery supply on or by inserting the external fuse(s) or circuit breaker(s).

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2. Reconnect the PV supply to the solar charger by switching the PV supply on or by inserting the external fuse(s) or circuit breakers(s).
6.6. Maintenance procedure
The solar charger does not need regular maintenance.

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7. Monitoring

This chapter describes all various monitoring methods and for each method how to access live data, historic data and errors.

7.1. LED indications
The solar charger has three LEDs to indicate operational status, a blue, green and a yellow LED. These LEDs respectively indicate the charge stages bulk, absorption and float, but are also used to indicate other charge situations and fault situations.
Errors are indicated via a combination of LEDs that are on, off, or are blinking. Each LED combination has a meaning, indicating either a normal operation mode, or indicating an error.

Symbol

Meaning Permanent on

Blinking

Off

Overview of LED indications: Operation mode
Not charging 1
Bulk1
Absorption2 Manual equalisation (alternating blinking)2 Automatic equalisation2
Float2

Bulk LED

Absorption LED

Float LED

1. The bulk LED will blink briefly every 3 seconds when the system is powered but there is insufficient power to start charging.
2. The LED(s) might blink every 4 seconds indicating that the charger is receiving data from another device, this can be a GX device (ESS) or a VE.Smart Network link via Bluetooth

Fault mode Charger temperature too high

Bulk LED

Absorption LED

Float LED

Charger over-current

Charger or panel over-voltage
VE.Smart networking or BMS issue
Internal error, calibration issue, settings data lost or current sensor issue.

For the latest and most up-to-date information about the LED blink codes, refer to the Victron Toolkit app. The app is available for Apple and Android. The app can be downloaded from the respective app stores or alternatively follow the download links on our software downloads page.

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7.2. Error codes
In case of an error, an error code will be displayed in the following ways: · Via its LEDs. · Via the VictronConnect app while it is connected to the solar charger. · Via an optional MPPT control or SmartSolar Control display. · Via an optional GX device or GlobalLink 520 and the VRM Portal. For the meaning of blinking LED codes, see the previous chapter or the Victron Toolkit app. For a full list of error codes and their meaning see the Error code overview chapter.
7.3. Monitoring via the VictronConnect app
The VictronConnect app can be used to monitor the solar charger, see its historical values and if there are operational warnings or errors. This chapter explains the solar charger-specific VictronConnect app usage. Refer to the general VictronConnect app manual for information about the VictronConnect app itself, such as: how to install the app, how to connect to the solar charger, how to update firmware and more.
Where battery voltage is referred in this chapter, a 12V battery is assumed. To arrive at values for 24V, 36V or 48V batteries, multiply the 12V values by a factor of 2, 3 or 4 respectively.
7.3.1. VictronConnect app status screen
The status screen displays the solar charger model name together with the live solar charger information.

VE Smart Networking
· The presence of the VE.Smart Networking symbol indicates that the solar charger is configured for VE.Smart Networking and is receiving battery temperature and/or battery voltage data from the VE.Smart Network.
Solar · The solar gauge shows the solar output in relation to the maximum output power that the solar charger can generate at the set
battery voltage and displays the dynamic real-time value of the solar array output power.
· The solar voltage measured at the solar terminals of the solar charger.
· The solar current flowing from the PV array into the solar charger.
Battery

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· The battery voltage measured at the battery terminals of the solar charger.
· The current flowing from the solar charger into the battery.
· The battery state indicates the battery charge stage or if external control is active. These are the possible states: Bulk During this stage the solar charger delivers as much charge current as possible to rapidly charge the batteries. When the battery voltage reaches the absorption voltage setting, the solar charger activates the absorption stage. Absorption During this stage the solar charger switches to the constant voltage mode, where a pre-set absorption voltage is applied. When the charge current decreases below 2A or if the pre-set absorption time has elapsed, the battery is fully charged and the solar charger will enter the Float stage. Note that when an automatic equalisation is being performed this will also be reported as absorption. Float During this stage the float voltage is applied to the battery to maintain a fully-charged state. When the battery voltage drops below float voltage during at least 1 minute, a new charge cycle will be triggered. External control This will be displayed when another device is controlling the charge behaviour of the solar charger, bypassing its normal charge algorithm. Examples are when the solar charger is controlled by an ESS system or a managed battery.
· In case the charger is not charging a “Why is the charger off?” message will display. When clicking on this message, a new window will open with more information as to why the solar charger is not charging.
Virtual load output · The state of the virtual load output, being switched on or switched off.
7.3.2. VictronConnect app history screen
The history screen shows a summary of the data collected over the previous 30 days. Swipe the screen to the right or left to show any of the 30 days.

To switch between portrait or landscape screen presentation click the fragmented square icon, or , at the top left of the screen. The daily log shows: · Solar yield: The energy (Wh) converted for that day.
· Solar Pmax: The maximum power (W) recorded during the day.
· Solar Vmax: The highest voltage (V) from the PV array during the day.
· Battery max and min: The first figure shows the maximum battery voltage (Vmax) for the day. The figure below is the minimum battery voltage(Vmin) for the day.

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· Errors: This shows the daily number of errors, if any. To get more information about the error(s), click the orange dot. You may need to slide the display on your device up to see the errors.)
· Lifetime total: This shows the total energy converted by the installation (W and is not re-settable). · Since reset: This shows how much energy has been converted by the installation since the last reset. Clicking on any bar (day) in the graph will expand the information. It will show the time and percentage of the total charge time that the solar charger has spent in each Bulk, Absorption and Float charge stage.
You can use the charge times to see if the PV array is properly sized for your requirements. A system that never reaches the float stage may need more panels. Or perhaps the load should be reduced?
The history can be exported as a comma-separated file (CSV) by clicking the three connected dots symbol or the save symbol at the top right of the history screen. The symbol varies, depending on what platform VictronConnect is used.
The history can be reset by clicking the clock with an arrow symbol at the top right of the history screen.
7.3.3. VictronConnect app error reporting
The VictronConnect app will indicate active errors while the app is actively connected to the solar charger. The error will show up in a pop-up window on the status screen together with the error number, name and a short error description. The VictronConnect app also displays historical errors. To see these errors, navigate to the “History” tab and look at the bottom of each day column. An orange dot will indicate an error on that day.

An active error and a historical error.
7.4. Monitoring via a GX device and VRM
If the solar charger is connected to a GX device, all its data can be accessed via the GX device. The GX device will also notify in case of solar charger alarms or faults. For more information see the GX device manual.

GX device showing alarm notification and historic errors.
If the GX device is connected to Victron Remote Monitoring (VRM) portal, the solar charger can be monitored remotely via the internet.
All solar charger data, alarms and errors can be accessed via the VRM portal and solar charger settings can be remotely changed via the VRM portal with the VictronConnect app.

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MPPT solar charger manual Solar charger alarm logging via VRM

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8. Troubleshooting

Refer to this chapter for addressing any unforeseen behaviour of the solar charger. Start by reviewing the common issues listed here during troubleshooting.
If the problem persists or requires technical assistance, contact the point of purchase ­ the Victron Energy dealer or distributor. If unsure whom to reach or unaware of the point of purchase, visit the Victron Energy Support webpage for guidance.

8.1. Solar charger is damaged
Before proceeding with troubleshooting, it is important to inspect the solar charger for any visible damage. Please note that damage to the solar charger is typically not covered by warranty.
By conducting this initial visual inspection, you can identify any visible damage that may impact the functionality of the solar charger:

Visual inspection

Step 1

Examine the solar charger for any signs of mechanical damage to the housing or electrical terminals. Please be aware that this type of damage is not covered by warranty.

Step 2

Inspect the electrical terminals of the solar charger for signs of burning or melting. This type of damage is often caused by loose electrical connections, the use of rigid core cables, or exceeding the MC4 terminal current ratings. Please be aware that this damage is not covered by warranty. Refer to chapter PV connections burned or melted [54] for more information.

Step 3

Look for any indications of water damage or corrosion on the solar charger, especially around the electrical connection area. It is important to note that such damage is not covered by warranty.

8.2. Solar charger is unresponsive
If the solar charger is unresponsive, it means that none of its LEDs will illuminate or blink, there is no charging activity, and it is unable to establish communication with the VictronConnect app through Bluetooth or the VE.Direct port.
Conversely, if the solar charger is active, you will notice its LEDs are either illuminated or blinking, and it can successfully communicate with the VictronConnect app via Bluetooth or the VE.Direct port.
The solar charger should activate as soon it receives power from the battery, the PV supply, or both. Note that the solar charger does not have an on/off switch.
To troubleshoot, verify that the solar charger is receiving either battery or PV power, using the below procedure.

Unresponsive solar charger troubleshooting procedure

Step 1

Set a multimeter to DC voltage mode.

· Measure the voltage between the positive and negative battery terminals of the solar charger.

· Measure the voltage between the positive and negative PV terminals of the solar charger.

Step 2

WARNING: Certain solar charger models may have PV voltages up to 250Vdc. Voltages exceeding 50V are generally considered dangerous. Only a qualified technician should handle dangerous voltages.

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Unresponsive solar charger troubleshooting procedure If the battery or PV voltage is below the minimum voltage, check the following: · Check the continuity of the battery and PV supply cables.

Step 3

· Inspect the fuses and circuit breakers in the battery and PV supply cables. · Ensure that all cable connections are sufficiently tightened.

· Verify if the battery voltage is sufficiently high. If not, charge the battery using an auxiliary charger.

Step 4

· Confirm if the PV voltage is sufficiently high. Check for any issues with the PV array, such as wiring mistakes, damaged panels, cloudy weather, nighttime conditions, etc.
If, even after confirming sufficient battery or PV voltage, the solar charger remains unresponsive, consider the solar charger to be faulty.

8.3. Solar charger is off
When the solar charger is off, the VictronConnect app shows this on the status screen. Click the “Why is the charger off?” text for a pop-up window with an explanation and possible remedies. The reasons why the solar charger is off: · There is insufficient PV power. Refer to the PV voltage too low [42] subchapter.
· The settings are being edited on an external display. Refer to the Settings being edited on an external display [43] subchapter.
· The charger is disabled in the settings. Refer to the Disabled in the settings [44] subchapter.
· The charger is disabled by remote or BMS. Refer to the Disabled by remote or BMS [44] subchapter.
· Low lithium battery temperature. Refer to the Low lithium battery temperature [44] subchapter.

VictronConnect app ­ Why is the charger off?
8.3.1. PV voltage too low
The solar charger starts charging when the PV voltage is 5V above the battery voltage. Charging continues if the PV voltage remains 1V higher than the battery voltage. To troubleshoot if a low PV voltage is the reason the solar charger is not charging, use the below procedure.

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MPPT solar charger manual PV and battery voltage check
Use the VictronConnect app, a solar charger display or a GX device to check the battery and PV voltage.
Step 1
If the above step is impossible, use a multimeter in DC mode to measure the battery and PV voltages at the solar charger terminals.

Step 2

Step 3

WARNING: Certain solar charger models may have PV voltages up to 250Vdc. Voltages exceeding 50V are generally considered dangerous. Only a qualified technician should handle dangerous voltages.
Compare both voltages. Remember that the PV voltage needs to be 5V higher than the battery voltage for charging to commence.

Possible reasons why the solar voltage might be too low: · Insufficient solar irradiance is reaching the solar panels:
· It is night. · There is cloudy or bad weather. · There is shade from nearby objects. See this shading blog story for more information. · The panels are dirty. · There are seasonal differences. The sun angle is lower in winter. · The panels have an incorrect panel orientation or inclination. · There are issues with a solar panel or the solar panel wiring: · There is a mechanical or electrical issue with an individual panel (or multiple panels). · Wiring problems, like loose wires, loose connections or incorrect crimped MC4 connectors. · Blown fuses. · Open or faulty circuit breakers. · Issues with splitters, combiners or incorrect usage of these components. · Incorrect PV array design or configuration: · The PV array is misconfigured. For example, there are an insufficient number of panels in a series string. · Reverse PV polarity: · The positive and negative PV wires have been mistakenly swapped when connected to the solar charger. For more
information, see the Reverse battery polarity [46] chapter.

8.3.2. Settings being edited on an external display
Charging is disabled when a MPPT Control external display is used to make configuration changes. Once the settings menu is closed on the display, charging will resume.

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8.3.3. Disabled in the settings
The charger has been disabled in the settings. Check the VictronConnect app battery settings page to ensure that the charger has been enabled.

VictronConnect app charger enable/disable setting

8.3.4. Disabled by remote or BMS
The charger has been switched off via its VE.Direct port.
Note that in systems with lithium batteries together with an external BMS, it is typical for the solar charger to be switched on or off as needed. This happens when the BMS turns off the charger due to full batteries or low temperatures (below ~5°C). Charging automatically resumes when the batteries are discharged or have warmed up.
If the solar charger has unexpectedly been switched off, check the following:

VE.Direct RX port functionality check

The VE.Direct port can be used to switch the solar charger on or off by utilising its RX functionality in combination with, for example, a VE.Direct non-inverting remote on/off cable.

Step 1

check if the RX port has been configured correctly. For more information, see the RX port settings [27] chapter and the VE.direct protocol documentation.

Step 2

If a VE.Direct non-inverting remote on/off cable) is used, check if it is in good working order.

Step 3

If a non-Victron cable is used, check if it is configured correctly. For more information see the VE.direct protocol documentation.

8.3.5. Low lithium battery temperature
Charging may be suspended if the battery temperature is low, as a part of the battery protection mechanism, without necessarily indicating a problem. The rationale behind this precaution is that lithium batteries are prone to damage when charged in temperatures below °5C.
If this protection is triggered unnecessarily, please reach out to your installer to adjust the related settings.
8.4. Solar charger is externally controlled
Managed batteries or an inverter/charger with an external control system (e.g., ESS system) can govern the solar charger via a GX device. The external system determines charging permissions and sets the charge voltage and currents.
When external control is active, it is visible on both the VictronConnect app and the GX device. This is normal behaviour and is not a fault.

The VictronConnect app indicates that the charger is externally controlled.
8.5. Batteries are not charged
This chapter explains scenarios where the charger is active, but the batteries are not charging. In such cases, the VictronConnect app will show the charger as active with the correct charge voltage, but the charge current will be at zero or very close to zero. There are several reasons why this can happen, namely: · The battery is fully charged, and no further current is required. This is normal behaviour and is not a fault. Refer to the Battery
is full [45] chapter for more details.
· Reverse PV polarity. Refer to the Reverse PV polarity [48] subchapter for more details.
· PV voltage is too high. Refer to the PV voltage too high [47] subchapter for more details.

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· Reverse battery polarity. Refer to the Reverse battery polarity [46] subchapter for more details. · The solar charger is disconnected from the battery, possibly due to cable, fuse, or circuit breaker issues. Refer to the Battery
not connected [45] subchapter for more details. · Incorrect charger configuration, e.g., low charge voltage or current setting. Refer to the Battery settings too low [47] subchapter for more details. · The charger is externally controlled (ESS or DVCC), which is normal and not a fault. Refer to the Solar charger externally
controlled chapter for more details. · The temperature-compensated charging feature is active, and the battery temperature is too high, or the feature is
misconfigured. Refer to the Wrong temperature compensation setting chapter for more details.

The VictronConnect app shows a close to zero charge current.
8.5.1. Battery is full
Once the battery is full, the solar charger will stop or significantly reduce its charge current. This is especially evident when DC loads are not drawing power from the battery. It is important to note that this behaviour is normal and not a fault. To determine the battery’s state of charge (SoC), check the battery monitor (if available) or inspect the charge stage indicated by the solar charger. During the daily charge cycle, the solar cycle progresses through the following stages: 1. Bulk stage: 0-80% SoC. 2. Absorption stage 80-100% SoC. 3. Float stage: 100% SoC. Be aware that the solar charger may detect the battery as fully charged when it’s not. This happens if the charge voltages are set too low, causing the charger to switch from absorption to float stage prematurely. Refer to the Battery settings too low chapter.
8.5.2. Battery not connected
To ensure proper battery charging, a correct connection to the battery is crucial. Be aware that that if the solar charger operates without a battery, it may seem connected, showing battery voltage and charge stage in the VictronConnect app, but the charge current will be negligible or zero. Potential reasons for a disconnected battery: · Loose or missing battery cables. · Loose cable connections. · Poorly crimped cable terminals. · A blown (or missing) fuse in the battery supply cable.

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· Open (or faulty) circuit breaker in the battery supply cable. · Incorrectly wired battery cables.
Battery voltage check Use the VictronConnect app, a connected display or a GX device to read the solar charger battery voltage. Alternatively, use a multimeter to measure the battery voltage at the terminals of the solar charger.
Step 1

Use a multimeter to measure the voltage at the battery terminals. Step 2

Step 3 Step 4

Compare the two voltages. In case of a voltage difference, investigate the reason behind it by tracing the path from the solar charger to the battery to identify the cause. · Check and confirm that all cabling is accurately connected and that there are no wiring errors.
· Inspect the cable connections for tightness while keeping the maximum torque levels in mind.
· Verify the correct crimping of all cable lugs or terminals.
· Check the fuses and circuit breakers.
Should you come across a blown fuse, make sure to check the correct wiring of the battery polarity before replacing it. Refer to the Reverse battery polarity [46] chapter.

8.5.3. Reverse battery polarity
Reverse polarity occurs when the positive and negative battery cables are accidentally swapped. This means the negative battery terminal connects to the positive solar charger terminal, and the positive battery terminal connects to the negative solar charger terminal.

Examples of correct and incorrect (reverse) battery polarity.
Be aware that a red or positively labelled cable may not necessarily indicate the cable is positive. A wiring or labelling mistake during the solar charger installation is possible. Always double-check the battery polarity before reconnecting the battery wires to the solar charger.

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Reverse battery polarity can potentially damage the solar charger, causing its internal fuse to blow for fail-safe protection. This fuse might blow before the external fuse in the battery cable. However, please note that the internal fuse is situated in a non-serviceable area, and it cannot be replaced or repaired. If this happens, the solar charger should be considered faulty. The solar charger is not protected against reverse battery polarity, and any resulting damage is not covered under warranty.
8.5.4. Battery settings too low
If the solar charger’s charge voltage and current are well below the manufacturer’s recommended levels, the battery charging process may become inadequate or excessively slow. Incorrect configuration can be a contributing factor, including: · Setting the “Battery voltage” parameter too low. · Setting the ”Absorption voltage” and “Float voltage” parameters too low. · Setting the “Max charge current” parameter to zero or an excessively low value.

VictronConnect app, showing battery (system) voltage, charge current and charge voltages settings.
8.5.5. PV voltage too high
The PV voltage should always stay within the maximum rated limit of the solar charger, as indicated in its product name, type plate and Technical specifications [60]. The solar charger can sustain damage based on the extent of the PV voltage height, and it’s important to note that such damage is not covered by warranty.
Should the PV voltage exceed the maximum rated PV voltage, the solar charger will cease charging, showing an overvoltage error #33 with rapid blinking of the absorption and float LEDs. Charging resumes only when the PV voltage drops 5V below the rated maximum voltage.
During investigations into high voltage issues, it’s essential to review the VictronConnect app, solar charger display, or GX device history. Check for the highest PV voltage recorded each day (Vmax) and past overvoltage warnings.
To avoid issues, check the open circuit voltage (Voc) rating of the PV array and ensure it is lower than the solar charger’s maximum rated voltage. Use the MPPT sizing calculator on the solar charger product page. For PV arrays in cold climates or with night temperatures nearing or below 10°C, it’s essential to consider possible increased output (more than its rated Voc). As a rule of thumb, maintain an additional 10% safety margin.

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VictronConnect app error #33 indication on the status screen and history screen.
8.5.6. Reverse PV polarity
When the solar charger is installed within the published specifications, internal protection guards the PV input against reverse PV polarity, and no error is displayed in such cases. To identify reverse PV voltage, watch for these indicators: · Absence of battery charging with the charge current remaining at zero.
· Excessive heat generated by the solar charger.
· PV voltage reading zero or close to zero.
To verify, use a multimeter to ensure that the positive PV cable is correctly connected to the positive PV terminal and the negative cable is connected to the negative PV terminal.

WARNING: Certain solar charger models may have PV voltages up to 250Vdc. Voltages exceeding 50V are generally considered dangerous. Only a qualified technician should handle dangerous voltages.
8.6. Batteries are undercharged
This chapter addresses the issue of undercharged batteries. It explores possible reasons why the solar charger might not be adequately charging the batteries and provides steps to check or resolve the situation. Some signs of undercharged batteries include: · Batteries taking too long to charge. · Batteries not being fully charged by the end of the day. · Charge current is less than expected. Several factors can cause this, such as: · Insufficient solar supply. Refer to the Insufficient solar supply [49] subchapter. · High DC load. Refer to the DC load too high [49] subchapter.

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· Voltage drop in battery cables. Refer to the Battery cable voltage drop [49] subchapter. · Incorrect temperature compensation setting. Refer to the Temperature compensation setting incorrect [50] subchapter. · Temperature difference between the solar charger and battery. Refer to the Temperature difference between solar charger and
battery [50] subchapter. · Battery charge voltages or current settings are too low. Refer to the Battery settings too low [47] chapter.
8.6.1. Insufficient solar supply
Check if the solar charger reaches the float charge stage each day. To investigate, check if the solar charger reaches the float charge stage each day. Utilise the VictronConnect app’s history tab, where a histogram displays the daily charging durations in the Bulk, Absorption, and Float stages for the last 30 days. Clicking on a histogram column provides a breakdown of the charge stages. You can use the charge times to assess whether the PV array is appropriately sized for your needs. Reasons for the solar charger not reaching the float stage include: · An inadequate number of solar panels. · Excessive DC load. · PV array issues causing reduced power output. · Solar charger is unable to reach full output. Refer to the Solar charger not achieving full output [52] chapter. Please note that this information does not apply to an ESS system. An ESS system will continuously be in the bulk charge stage while connected to the grid.

Left: Example of a system that is spending all its time in the bulk stage. Right: Breakdown of the charge stages – The system spends time in bulk and in the absorption stage.
8.6.2. DC load too high
The solar charger not only charges the batteries but also supplies power for the system’s DC loads, such as lights, refrigerators, inverters, inverter/chargers and more. Battery charging occurs only when the power generated by the PV panels exceeds the power consumed by the system’s DC loads. To check the PV array’s power generation and load power usage: To check the PV array’s power generation and load power usage: · If the system includes a properly installed and configured battery monitor, you can monitor the current flowing in (or out) of the
battery, while the solar charger indicates the current generated by the solar array.
· Use a current clamp and compare the current flowing from the solar charger into the battery and the current flowing from the battery into the DC system.
· A positive sign alongside the current reading indicates current flowing into the battery, whereas a negative sign suggests current being drawn from the battery.
8.6.3. Battery cable voltage drop
If the battery cables experience a voltage drop, the solar charger will produce the correct voltage, but the batteries will receive a lower voltage, potentially leading to undercharged batteries. An excessive voltage drop of more than 2.5% is unacceptable. The voltage drop can result in the following: · Longer battery charging times.
· Battery receiving a charge voltage that is too low.

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· Loss of charge power. · Increased heat in the battery cables. The voltage drop can be caused by: · Battery cables with insufficient cross-sectional area. · Poorly crimped cable lugs or terminals. · Loose terminal connections. · Faulty or loose fuse(s). For more information on cabling issues and voltage drop, refer to the Wiring Unlimited Book.

Battery cable voltage drop check

Step 1

Make sure that the charger is charging with the full current, preferably in the morning. Use the VictronConnect app to confirm the output current.

Using the VictronConnect app or a multimeter, measure the voltage on the battery terminals of the solar charger.

Step 2

Measure the battery voltage on the terminals of the battery using a multimeter. Step 3

Step 4

Compare the two voltages to identify any voltage difference.

VE.Smart Networking can assist in mitigating a small cable voltage drop. However, for a substantial voltage drop, there may be an issue with the wiring between the solar charger and the battery, which requires rectification before proceeding.
In a VE.Smart Network a Smart Battery Sense or battery monitor measures the battery terminal voltage and transmits this via VE.Smart Networking to the solar charger. If the battery voltage is less than the solar charge voltage, the solar charger will increase its charge voltage to compensate for (small) voltage losses.

8.6.4. Temperature compensation setting incorrect
Improperly configuring the temperature compensation coefficient can lead to either undercharged or overcharged batteries.
Note that temperature compensation is typically applicable only to lead-acid batteries.
To determine the correct temperature compensation coefficient for your battery, consult the battery documentation. If uncertain, use the default value of -64.80mV/°C for lead-acid batteries, and for lithium batteries, disable the temperature compensation setting.

8.6.5. Temperature difference between solar charger and battery
For proper operation, it is crucial that the ambient temperatures of both the battery and the solar charger are equal, especially if the solar charger is not receiving battery temperature data.

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Note that this chapter does not apply if the solar charger is connected to a VE.Smart Network with a battery temperature measurement or is equipped with a temperature sensor.
At the beginning of the day, as soon as power is generated by the solar array, the solar charger will measure the ambient temperature and use it to temperature-compensate the charge voltage. During the float stage, the solar charger will re-measure the ambient temperature and adjust the voltages accordingly. Large differences in ambient temperature between the solar charger and the battery can lead to improper charging voltages for the battery. For instance, if the solar charger is placed near a sunlit window while the batteries are located on a cold concrete floor in the shade, this temperature discrepancy can affect the charging process. To ensure optimal performance, always ensure that the ambient conditions are equal for both the solar charger and the battery.
8.7. Batteries are overcharged
WARNING: Overcharging batteries can be extremely dangerous! There is a significant risk of battery explosion, fire, or acid leakage. To prevent accidents, do not smoke, create sparks, or have open flames in the same room where the batteries are located.

Overcharging batteries can lead to severe battery damage and may be caused by the following factors: · Incorrect charge voltage settings. Refer to the Battery charge voltage settings too high [51] subchapter.
· Battery voltage setting too high. Refer to the Battery voltage setting too high [51] subchapter.
· Applying equalisation while the battery is not suitable for it. Refer to the Battery unable to deal with equalisation [51] subchapter.
· The battery is too small, old, has been mistreated in the past or is faulty. Refer to the Battery old, faulty or undersized [52] subchapter.
8.7.1. Battery voltage setting too high
If the “battery voltage” setting in the VictronConnect app is configured to a voltage higher than the actual system voltage, it will result in overcharging the battery. The solar charger automatically detects the battery voltage on the first install, and afterwards, the self-detection is disabled. However, if the solar charger is moved from a 24V system to a 12V system, it may not recognise the system change. Consequently, it will continue charging with 24V battery charge voltages, while the connected battery is a 12V battery, leading to overcharging of the 12V battery. To verify the “battery voltage” setting, use the VictronConnect app or a connected display. If the setting is incorrect, make sure to adjust it to the correct battery voltage.
8.7.2. Battery charge voltage settings too high
Batteries can be overcharged if the battery charge voltages are set too high. Verify that all the battery charge voltages (absorption and float) are correctly configured to match the recommended voltages specified in the battery manufacturer’s documentation.
8.7.3. Battery unable to deal with equalisation
When equalisation occurs, the battery charge voltage will be considerably high, and if the battery is unsuitable for equalisation, it may be overcharged. It’s essential to note that not all batteries can handle equalisation voltages. Check with the battery manufacturer to determine if the battery you are using requires a periodic equalising charge. In general, sealed batteries and lithium batteries do not require equalisation and should not undergo the equalisation process.

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8.7.4. Battery old, faulty or undersized
A battery that has reached the end of its service life or has been damaged due to improper use may be susceptible to overcharging.
A battery is comprised of multiple cells connected in series. In the case of an old or damaged battery, it’s possible that one of these cells is no longer operational. During charging, the faulty cells will not accept charge, and the remaining cells will receive the broken cell’s charge voltage, resulting in overcharging.
To address this issue, replace the battery. If the system includes multiple batteries, it’s recommended to replace the entire battery bank rather than mixing batteries of different ages in one bank.
Determining the exact history of a battery during its lifetime can be

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