victron energy M8 Lynx Shunt VE Can Instruction Manual

victron energy M8 Lynx Shunt VE Can

Product Information

Specifications

• Positive and negative busbars
• Battery Monitor
• The fuse holder for the main system fuse
• Communicates via VE.Can with a GX device
• Ships with two RJ45 VE.Can terminators
• Designed to hold a CNN fuse (fuse needs to be purchased separately)
• Compatible with GX devices: Cerbo GX & GX Touch, CCGX, and Venus GX

Introduction

The Lynx Shunt VE.Can
The Lynx Shunt VE.Can is a component of the Lynx Distribution system. It consists of a positive and negative busbar, a battery monitor, and a fuse holder for the main system fuse. It can communicate via VE.Can with a GX device. The Lynx Shunt VE.Can is shipped with two RJ45 VE.Can terminators, which are used when connecting to a GX device. It is designed to hold a CNN fuse, which needs to be purchased separately.

GX device
The Lynx Shunt VE.Can can be monitored and set up with a GX device. For more information on the GX device, please refer to the GX device product page. The GX device can also be connected to the VRM portal for remote monitoring. For more information on the VRM portal, please see the VRM page.

Product Usage

Safety Precautions

Safety Warnings Lynx Distribution System
Follow the safety warnings provided in the Lynx Distribution System manual to ensure safe operation and installation.

Transport and Storage
When transporting or storing the Lynx Shunt VE.Can, ensure it is properly secured to prevent damage. Avoid exposing it to extreme temperatures or humidity.

Commissioning the Lynx Shunt VE.Can
Before using the Lynx Shunt VE.Can, it needs to be commissioned. Follow the steps below:

1. Ensure all connections are properly made according to the Lynx Distribution System manual.
2. Connect the Lynx Shunt VE.Can to a GX device using the provided RJ45 VE.Can terminators.
3. Power on the GX device and follow its setup instructions to establish communication with the Lynx Shunt VE.Can.

Operation Lynx Shunt VE.Can
Once the Lynx Shunt VE.Can is commissioned, it can be operated as follows:

1. Monitor the battery status and current flow using the GX device connected to the Lynx Shunt VE. Can.
2. Make any necessary adjustments or configurations through the GX device interface.

Synchronizing SoC to 100%
To synchronize the State of Charge (SoC) measurement of the battery with the Lynx Shunt VE. Canto 100%, follow these steps:

1. Ensure the battery is fully charged.
2. Access the GX device interface and navigate to the Lynx Shunt VE.Can settings.
3. Find the option to synchronize SoC and select it.
4. Follow the on-screen instructions to complete the synchronization process.

Zero Current Calibration
To calibrate the zero current measurements of the Lynx Shunt VE.Can, perform the following steps:

1. Disconnect any loads connected to the Lynx Shunt VE.Can.
2. Access the GX device interface and navigate to the Lynx Shunt VE.Can settings.
3. Find the option for zero current calibration and select it.
4. Follow the on-screen instructions to complete the calibration process.

Battery Capacity and Peukert Exponent
The Lynx Shunt VE.Can calculate battery capacity and consider the Peukert exponent. For more information on how to configure and interpret these values, refer to the Lynx Distribution System manual.

FAQ

• Q: What is the purpose of the Lynx Shunt VE.Can?
  A: The Lynx Shunt VE.Can is a component of the Lynx Distribution system that provides monitoring and control capabilities for battery systems.

• Q: Can I use the Lynx Shunt VE.Can without a GX device?
  A: No, the Lynx Shunt VE.Can require a GX device for monitoring and setup.

• Q: Where can I purchase the CNN fuse for the Lynx Shunt VE.Can?
  A: The CNN fuse needs to be purchased separately. Please refer to the documentation or contact the manufacturer for more information on where to purchase the fuse.

Safety Precautions

Safety Warnings Lynx Distribution System

• Do not work on live busbars. Ensure that the busbar is unpowered by disconnecting all positive battery poles prior to removing the Lynx front cover.
• Work on batteries should be carried out by qualified personnel only. Observe the battery safety warnings as listed in the battery manual.

Transport and Storage

• Store this product in a dry environment.
• The storage temperature should be: -40°C to +65°C.
• No liability can be accepted for damage in transit if the equipment is not transported in its original packaging.

Introduction

The Lynx Shunt VE.Can

• The Lynx Shunt VE.Can contains a positive and negative busbar, a battery monitor and a fuse holder for the main system fuse. It is part of the Lynx Distribution system.
• The Lynx Distributor has a power LED.
• The Lynx Shunt VE.Can can communicate via VE.Can with an GX device.
• The Lynx Shunt VE.Can ship with two RJ45 VE.Can terminators, be used when connecting to a GX device?
• The Lynx Shunt VE.Can is designed to hold a CNN fuse. The fuse needs to be purchased separately. For more info see Fusing [10]

GX device

• The Lynx Shunt VE.Can can be monitored and setup with a GX device.
• For more information on the GX device see the GX device product page.
• The GX device can be connected to the VRM portal allowing for remote monitoring.
• For more information on the VRM portal see the VRM page.

Temperature sensor

• A temperature sensor can be connected to the Lynx Shunt VE.Can. It is used to measure the battery temperature.
• The temperature sensor is an optional extra. It needs to be purchased separately. For more information see the Temperature Sensor QUA PMP GX device product page.

VictronConnect App
For more information see the VictronConnect App download page and the VictronConnect manual.

The Lynx Distribution System
The Lynx Distribution System is a modular busbar system that incorporates DC connections, distribution, fusing, battery monitoring, and/or Lithium battery management. For more information also see the DC Distribution Systems product page.

The Lynx Distribution System consists of the following parts:

• Lynx Power In – A positive and negative busbar with 4 connections for batteries or DC equipment.
• Lynx Distributor – A positive and negative busbar with 4 fused connections for batteries or DC equipment together with fuse monitoring.
• Lynx Shunt VE.Can – A positive busbar with a space for a main system fuse and a negative busbar with a shunt for battery monitoring. It has VE.Can communication for monitoring and setup with a GX device.
• Lynx Smart BMS – For use together with Victron Energy Smart Lithium batteries. It contains a positive busbar with a contactor that is driven by a battery management system (BMS) and a negative busbar with a shunt for battery monitoring. It has Bluetooth communication for monitoring and setup via the VictronConnect App and VE.Can communication for monitoring with a GX device and the VRM portal.

Internal parts and wiring diagram Lynx Shunt VE.Can
The internal physical parts and the wiring diagram of the Lynx Shunt VE.Can indicating the following parts:

• Positive busbar
• Negative busbar
• Main system fuse
• Shunt

Main Fuse

Main fuse

• The Lynx Shunt houses the main system fuse.
• The fuse is being monitored by the Lynx Shunt VE.Can and, if the fuse blows, the power LED turns red and an alarm message is sent to the GX device.
• The relay can be driven by the blown fuse parameter.

Battery Monitor (shunt)

• The Lynx Shunt VE.Can the battery monitor operate similarly as the other Victron Energy battery monitors? It contains a shunt and battery monitor electronics.
• Readout of the battery monitor data is via a GX device or the VRM portal.

Alarm relay
The Lynx Shunt VE.Can has an alarm relay. This relay can be programmed via the GX device to open or close using the following parameters:

• Battery State of charge
• Battery voltage
• Battery temperature
• Fuse blown

The alarm relay can, for example, be used to start or stop a generator based on battery state of charge or battery voltage. The alarm messages that are send to the GX device or to the VRM portal are programable in a similar fashion.

Temperature sensor

• The temperature sensor is an optional extra to measure the battery temperature. If used, the Lynx Shunt VE.Can will measure the temperature of the battery and can be used to drive the Lynx Shunt VE.Can alarm relay.
• The temperature data or temperature alarms will also be sent to the GX device and from there to the VRM portal. On the VRM portal the temperature data is logged and can be accessed.

Figure 1. VRM data logging battery temperature example

Communication and interfacing

GX Device
The Lynx Smart BMS can be connected to a GX device via VE.Can. The GX device will show all measured parameters, operational state, battery SoC, and alarms.

NMEA2000
Communication with an NMEA2000 network can be established via the Lynx Shunt VE.Can VE.Can connect together with a VE.Can to NMEA2000 micro-C male cable.

Supported NMEA 2000 PGNs:

• Product Information – PGN 126996
• DC detailed Status – PGN 127506
• DC/Battery Status – PGN 127508
• Switch Bank Status – PGN 127501
• Status 1: Contactor
• Status 2: Alarm
• Status 3: Battery voltage low
• Status 4: Battery voltage high
• Status 5: Programmable relay status

Class and function:

• N2K device class: Electrical generation
• N2K device function: Battery
• For more information see the NMEA2000 & MFD integration guide.

System Design

Lynx distribution system parts
A Lynx distribution system consists of a single Lynx Shunt VE.Can module. Then, single, multiple or a combination of Lynx Distributor modules and/or Lynx Power In modules are added. Together they form a continuous negative and positive busbar with DC connections and, depending on the configuration, integrated fuses, a battery monitor and/or lithium battery management.

Interconnecting Lynx modules
Each Lynx module can connect to other Lynx modules on the left side (M8 hole) and on the right side (M8 bolt). If the Lynx module is the first in line, the last in line or is used by itself, it is possible to connect batteries, loads or chargers directly to these connections. However, we do not generally recommend this because additional insulation and fusing is needed.

The example below shows a Lynx system consisting out of a Lynx Power In, Lynx Shunt VE.Can and Lynx Distributor. Together they form a continuous busbar, with un-fused battery connections, battery monitor, main system fuse and fused load connections.

Figure 2. Example of Interconnected Lynx modules without their covers (Lynx Shunt VE.Can)

Orientation of Lynx modules
If the Lynx System contains a Lynx Shunt VE.Can, the batteries always have to be connected to the left side of the Lynx System and the rest of the DC system (loads and chargers) connect to the right side. This, so the battery state of charge can be correctly calculated.

• Example of Lynx module orientation: the batteries connect to the left side and all loads and chargers connect on the right side
• The Lynx modules can be mounted in any orientation. Should they be mounted upside down, so that the text on the front of the units is upside down as well, use the special stickers are included with each Lynx module, so that the text is orientated the correct way.

System example – Lynx Shunt VE.Can, Lynx Power In, Lynx Distributor and lead acid batteries

This system contains the following components:

• Lynx Power In with 4 paralleled 12V lead acid batteries.
• Identical cable lengths for each battery.
• Lynx Shunt VE.Can with main system fuse and battery monitor.
• Lynx Distributor with fused connections for inverter/charger(s), loads and chargers. Note that additional modules can be added if more connections are needed.
• CCGX (or other GX device) to read out the battery monitor data.

System sizing

Current rating Lynx modules
The Lynx Distributor, Lynx Shunt VE.Can and the Lynx Power In are rated for a nominal current of 1000A, for 12, 24, or 48 System voltages. To give an idea of how much power the Lynx modules are rated at different voltages, see the below table. The power rating will give you an indication of how big the connected inverter/charger system can be. Keep in mind that if inverters or inverters/chargers are used, both the AC and DC systems will be powered by the batteries. Also, be aware that a Lynx Smart BMS or a Lynx Ion (now discontinued) can have a lower current rating.

| 12V| 24V| 48V
---|---|---|---
1000A| 12kW| 24kW| 48kW

Fusing
The Lynx VE.Can has a space for a main fuse. This space has been designed to fit a CNN fuse. A 325A/80V fuse is available from Victron Energy (CIP140325000-Fuse CNN 325A/80V for Lynx shunt) or use another CNN fuse by Littlefuse. Although the distance between the fuse mounting bolts is designed for a CNN fuse but it might also be possible to fit other fuse types in this space. The fuse mounting bolts are M8 and their centres are 63mm apart.

Always use fuses with the correct voltage and current rating. Match the fuse rating to the maximum voltages and currents that potentially can occur in the fused circuit. For more information on fuse ratings and fuse current calculations see the Wiring Unlimited book.

The total value of the fuses of all circuits should not be more than the current rating of the Lynx module, or the Lynx model with the lowest current rating in case multiple Lynx modules are used.

Cabling
The current rating of the wires or cables used to connect the Lynx Shunt VE.Can to batteries and/or DC loads, have to be rated for the maximum currents that can occur in the connected circuits? Use cabling with a sufficient core surface area to match the maximum current rating of the circuit. For more information on cabling and cable thickness calculations see our book, Wiring Unlimited.

Installation

Mechanical connections

Lynx module connection features
The Lynx module can be opened up by unscrewing the 2 cover screws. The contacts on the left side are covered by a removable rubber sleeve. Red is the positive and black is the negative busbar.

Mounting and interconnecting Lynx modules

• This paragraph explains how to attach several Lynx modules to each other and how to mount the Lynx assembly into its final location.
• For a mechanical drawing of the housing with dimensions and the location of the mounting holes, see the appendix of this manual.

These are the points to take into consideration when interconnecting and mounting Lynx modules:

• If Lynx modules are going to be connected to the right and if the Lynx module is fitted with a plastic barrier on the right side, remove the black plastic barrier. If the Lynx module is located as the most right module, leave the black plastic barrier in place.
• If Lynx modules are going to be connected to the left, remove the red and black rubber sleeves. If the Lynx module is located as the most left module, leave the red and black rubber sleeves in place.
• If the Lynx system contains a Lynx Smart BMS or Lynx Shunt VE.Can, the left side is the battery and the right side is the DC system side.
• Connect all Lynx modules to each other using the M8 holes and bolts on the left and right. Take care that the modules correctly slot into the rubber joiner recesses.
• Place the washer, spring washer and nut on the bolts and tighten the bolts using a torque of 14Nm.
• Mount the Lynx assembly in its final location using the 5mm mounting holes.

Figure 3. Connection sequence when connecting two Lynx modules

Electrical connections

Connect DC wires
This chapter might not apply if the Lynx module is connected to other Lynx modules this can be the case for the Lynx Smart BMS or the Lynx Shunt VE.Can.

For all DC connections, the following applies:

• All cables and wires connected to the Lynx module need to have been fitted with M8 cable lugs.
• Pay attention to the correct placement of the cable lug, washer, spring washer, and nut on each bolt when attaching the cable to the bolt.
• Tighten the nuts with a torque moment of 14Nm.

Figure 4. Correct mounting sequence DC wires

Connect RJ10 cable(s)
These instructions only apply if the system contains Lynx distributor(s) together with a Lynx Smart BMS or a Lynx Shunt VE.Can. There are two RJ10 connectors in each Lynx Distributor, one on the left and one on the right. See below drawing.

To connect the RJ10 cables between the various Lynx modules do the following:

• Plug one side of the RJ10 cable in the RJ10 connector of the Lynx Distributor with the retainer clip of the RJ10 connector facing away from you.
• Feed the RJ10 cable through the recess at the bottom of the Lynx Distributor, see above picture.
• To connect to a Lynx Shunt VE.Can, feed the cable through its bottom recess and plug the RJ10 cable into the RJ10 connector.

Connect the temperature sensor

• An optional battery temperature sensor can be connected to the green terminal with the + and – symbol.
• The connector can be removed from the terminal, for easy connection.
• The temperature sensor is polarity-sensitive. Connect the black wire to the – terminal and the red wire to the + terminal.

Connect the alarm relay
The alarm relay connector is the black 2-way connector. See below image for its location.

Place main fuse

• Place the main fuse in the Lynx Shunt VE.can.
• Be aware that if the positive bus is already powered, the moment the fuse is placed the system will become live.

Connect the GX device

• Connect the Lynx Shunt VE.Can VE.Can port to the GX device VE.Can port using a RJ45 cable.
• Multiple VE.Can devices can be interconnected, but make sure that the first and the last VE.Can devices both have a VE.Can RJ45 terminator installed?
• Power the GX device from the output of the Lynx Shunt VE.Can or a Lynx distributor connected to the output of the Lynx Shunt VE.Can.

Configuration and settings

Settings Lynx Shunt VE.Can
Once powered up and connected to a GX device, navigate to the Lynx Shunt VE.Can settings menu on the GX device to make and change settings.

Most settings can be left to their default values, but there are a few essential settings to make by your own:

• Set the battery capacity.
• If lithium batteries are used, specific battery monitor settings are needed. Refer to the battery monitor settings chapter.
• If the alarm relay is used, set the alarm relay parameters.

For a full overview and an explanation of all battery monitor settings, refer to the battery monitor setting chapter

Commissioning the Lynx Shunt VE.Can

Commissioning sequence:

• Check the polarity of all DC cables.
• Check cross cross-sectional area of all DC cables.
• Check if all cable lugs have been crimped correctly.
• Check if all cable connections are tight (don’t exceed maximum torque).
• Tug slightly on each battery cable to check if the connections are tight and if the cable lugs have been crimped correctly.
• Turn a load on and see if the battery monitor displays the correct current polarity.
• Fully charge the battery, so that the battery monitor synchronizes.

Operation Lynx Shunt VE.Can

• The Lynx Shunt VE.Can is active as soon as power is applied to the input (battery side) of the Lynx Shunt VE.Can.
• The Lynx Shunt VE.Can monitor the state of charge of the battery and monitor the fuse.

LED indications
The basic Lynx Shunt VE.Can operation status is displayed via it power LED. See the below table for the information displayed via the Power LED.

Table 1. Lynx Shunt VE.Can operational status

GX device indications

• Operational data is displayed on the connected GX device. This includes data such as battery voltage, battery current, state of charge and so on.
• See below table of all monitored parameters.

Table 2. Lynx Shunt VE.Can operational data

Amps
Battery energy| Displays the power that flows into or out of the battery| Watt
State of charge| The state of charge indicates the percentage of the battery capacity that is| Percentage
| still available for consumption. A full battery will show 100 %, and an empty|
| battery will display 0 %. This is the best way to see when the batteries|
| need to be recharged|
Consumed| Displays the energy consumed since the battery was last fully charged| AmpHours
AmpHours| |
Time to go| Displays the estimated time, based on the current load, before the| Hours and
| batteries need to be recharged.| minutes
Relay state| Displays the state of the relay. On means that the relay contacts are| On/off
| closed, off means that the relay contacts are open.|
Alarm state| Displays if an alarm is active or not| Ok/Alarm
Battery temperature| Displays the battery temperature| Degrees Celsius
Firmware version| The Firmware version of this device| Number

Historical data
The Lynx Shunt VE.Can keeps track of historical data providing information about the state and the past use of the batteries. See below table of all monitored parameters.

Table 3. Historical data Lynx Shunt VE.Can

Number
High voltage alarms| The number of times a high voltage alarm has occurred.| Number
Clear history| Press to clear all historic data.| Press to clear

Alarms and the alarm relay
In case of an alarm, a message is sent to the GX device and the VRM portal and/or the alarm relay is activated.

The alarm conditions are:

• Battery state of charge
• Battery voltage
• Battery temperature
• Main fuse blown

Battery monitor settings

This chapter explains all battery monitor settings. In addition to this, we also have a video available explaining these settings and how they interact with each other to achieve accurate battery monitoring for both lead-acid and lithium batteries. https://www.youtube.com/embed/mEN15Z_S4kE.

Battery capacity

• This parameter is used to tell the battery monitor how big the battery is. This setting should already have been done during the initial installation.
• The setting is the battery capacity in Amp-hours (Ah).
• For more information on the battery capacity and the related Peukert exponent see the Battery Capacity and Peukert exponent [24] chapter.

Charged voltage
The battery voltage must be above this voltage level to consider the battery as fully charged. As soon as the battery monitor detects that the voltage of the battery has reached this “charged voltage” parameter and the current has dropped below the “tail current [21]” parameter for a certain amount of time, the battery monitor will set the state of charge to 100%.

• The “charged voltage” parameter should be set to 0.2V or 0.3V below the float voltage of the charger.
• The table below indicates the recommended settings for lead-acid batteries.

Tail current

• The battery is considered as fully charged once the charge current has dropped to less than this “Tail current” parameter. The “Tail current” parameter is expressed as a percentage of the battery capacity.
• Note that some battery chargers stop charging when the current drops below a set threshold. In these cases, the tail current must be set higher than this threshold.
• As soon as the battery monitor detects that the voltage of the battery has reached the set “Charged voltage [21]” parameter and the current has dropped below this “Tail current” parameter for a certain amount of time, the battery monitor will set the state of charge to 100%.

Charged detection time
This is the time the “Charged voltage [21]” parameter and the “Tail current [21]” parameter must be met in order to consider the battery fully charged.

Peukert exponent
Set the Peukert exponent parameter according to the battery specification sheet. If the Peukert exponent is unknown, set it at 1.25 for lead-acid batteries and set it at 1.05 for lithium batteries. A value of 1.00 disables the Peukert compensation. The Peukert value for lead-acid batteries can be calculated. For more information on the Peukert calculation, the Peukert exponent and how this relates to the battery capacity, see the Battery capacity and Peukert exponent [24] chapter.

Charge efficiency factor
The “Charge Efficiency Factor” compensates for the capacity (Ah) losses during charging. A setting of 100% means that there are no losses. A charge efficiency of 95% means that 10Ah must be transferred to the battery to get 9.5Ah actually stored in the battery. The charge efficiency of a battery depends on battery type, age and usage. The battery monitor takes this phenomenon into account with the charge efficiency factor.

The charge efficiency of a lead acid battery is almost 100% as long as no gas generation takes place. Gassing means that part of the charge current is not transformed into chemical energy, which is stored in the plates of the battery, but is used to decompose water into oxygen and hydrogen gas (highly explosive!). The energy stored in the plates can be retrieved during the next discharge, whereas the energy used to decompose water is lost. Gassing can easily be observed in flooded batteries. Please note that the ‘oxygen only’ end of the charge phase of sealed (VRLA) gel and AGM batteries also results in a reduced charge efficiency.

Current threshold
When the current measured falls below the “Current threshold” parameter it will be considered zero. The “Current threshold” is used to cancel out very small currents that can negatively affect the long-term state of charge readout in noisy environments. For example, if the actual long-term current is 0.0A and, due to injected noise or small offsets, the battery monitor measures 0.05A the battery monitor might, in the long term, incorrectly indicate that the battery is empty or will need to be recharged. When the current threshold in this example is set to 0.1A, the battery monitor calculates with 0.0A so that errors are eliminated.

A value of 0.0A disables this function.

Time-to-go averaging period
The time-to-go averaging period specifies the time window (in minutes) that the moving averaging filter works. A value of 0 (zero) disables the filter and gives an instantaneous (real-time) readout. However, the displayed “Time remaining” value may fluctuate heavily. Selecting the longest time, 12 minutes, will ensure that only long-term load fluctuations are included in the “Time remaining” calculations.

Synchronise SoC to 100%
This option can be used to manually synchronise the battery monitor. In the VictronConnect app press the ”Synchronise” button to synchronise the battery monitor to 100%.

Zero current calibration
This option can be used to calibrate the zero reading if the battery monitor reads a non-zero current even when there is no load and the battery is not being charged. A zero current calibration is (almost) never needed. Only perform this procedure in case the battery monitor shows a current while you are absolutely sure that there is no actual current flowing. The only way to be sure is to physically disconnect all wires and cables connected to the side of the shunt. Do this by unscrewing the shunt bolt and removing all cables and wires from that side of the shunt. The alternative, switching loads or chargers off, is NOT accurate enough as this does not eliminate small standby currents.

Battery capacity and Peukert exponent

Battery capacity is expressed in Amp hour (Ah) and indicates how much current a battery can supply over time. For example, if a 100Ah battery is being discharged with a constant current of 5A, the battery will be totally discharged in 20 hours.

The rate at which a battery is being discharged is expressed as the C rating. The C rating indicates how many hours a battery with a given capacity will last. 1C is the 1h rate and means that the discharge current will discharge the entire battery in 1 hour. For a battery with a capacity of 100Ah, this equates to a discharge current of 100A. A 5C rate for this battery would be 500A for 12 minutes (1/5 hours), and a C5 rate would be 20A for 5 hours.

There are two ways of expressing the C rating of a battery. Either with a number before the C or with a number after the C.

For example:

• 5C is the same as C0.2
• 1C is the same as C1
• 0.2C is the same as C5

The capacity of a battery depends on the rate of discharge. The faster the rate of discharge, the less capacity will be available. The relation between slow or fast discharge can be calculated by Peukert’s law and is expressed by the Peukert exponent. Some battery chemistries suffer more from this phenomenon than others. Lead acids are more affected by this than lithium batteries are. The battery monitor takes this phenomenon into account with the Peukert exponent.

Discharge rate example

• A lead acid battery is rated at 100Ah at C20, this means that this battery can deliver a total current of 100A over 20 hours at a rate of 5A per hour. C20 = 100Ah (5 x 20 = 100).
• When the same 100Ah battery is discharged completely in two hours, its capacity is greatly reduced. Because of the higher rate of discharge, it may only give C2 = 56Ah.

Peukert’s formula
The value that can be adjusted in Peukert’s formula is the exponent n: see the formula below. In the battery monitor, the Peukert exponent can be adjusted from 1.00 to 1.50. The higher the Peukert exponent the faster the effective capacity ‘shrinks’ with increasing discharge rate. An ideal (theoretical) battery has a Peukert exponent of 1.00 and has a fixed capacity regardless of the size of the discharge current. The default setting in the battery monitor for the Peukert exponent is 1.25. This is an acceptable average value for most lead acid batteries.

Peukert’s equation is stated below:

To calculate the Peukert exponent you will need two rated battery capacities. This is usually the 20h discharge rate and the 5h rate, but can also be the 10h and 5h, or the 20h and the 10h rate. Ideally use a low discharge rating together with a substantially higher rating. Battery capacity ratings can be found in the battery datasheet. If in doubt contact your battery supplier.

Calculation example using the 5h and the 20h rating The C5 rating is 75Ah.

The t1 rating is 5h and I1 is calculated:

The C20 rating is 100Ah. The t2 rating is 20h and I2 is calculated:

The Peukert exponent is:

A Peukert calculator is available at http://www.victronenergy.com/support- and-downloads/software#peukert-calculator.

Please note that the Peukert exponent is no more than a rough approximation of reality. In case of very high currents, the battery will give even less capacity than predicted by a fixed exponent. We do not recommend changing the default value in the battery monitor, except in the case of lithium batteries.

Troubleshooting and Support

• Consult this chapter in case of unexpected behaviour or if you suspect a product fault.
• The correct troubleshooting and support process is to first consult the common issues as described in this chapter.
• Should this fail to resolve the issue, contact the point of purchase for technical support. If the point of purchase is unknown, refer to the Victron Energy Support webpage.

Cabling issues

Cables heat up
This can be caused by a wiring or connection issue. Check the following:

• Check if all cable connections are tightened with a torque moment of 14Nm.
• Check if all fuse connections are tightened with a torque moment of 14Nm.
• Check if the surface area of the cable core is large enough for the current through that cable.
• Check if all cable lugs have been crimped correctly and are tight enough.

Other cabling issues
For additional information about issues that can arise from bad or incorrect cabling, cable connections or wiring of battery banks refer to the Wiring Unlimited Book.

Main fuse issues
For additional information about issue that can arise from an incorrect fuse rating or type refer to the Wiring Unlimited Book.

Fuse blows as soon as a new fuse is installed

• Check the DC circuit that is attached to the fuse for the following:
• Check if there is a short circuit.
• Check if there is a malfunctioning load.
• Check if the current in the circuit Is not larger than the fuse rating.

Battery monitor issues

Charge and discharge current are inverted

• The charge current should be shown as a positive value. For example: 1.45A.
• The discharge current should be shown as a negative value. For example: -1.45A.
• If the charge and discharge currents are reversed, the negative power cables on the battery monitor must be swapped.

Incomplete current reading

• The negatives of all the loads and the charge sources in the system must be connected to the system minus side of the shunt.
• If the negative of a load or a charge source is connected directly to the negative battery terminal or the “battery minus” side on the shunt, their current will not flow through the battery monitor and will be excluded from the overall current reading and the state of charge reading.
• The battery monitor will display a higher state of charge than the actual state of charge of the battery.

There is a current reading while no current flows
If there is a current reading while no current is flowing through the battery monitor, perform a zero current calibration [22] while all loads are turned off or set the current threshold [22].

Incorrect state of charge reading
An incorrect state of charge can be caused by a variety of reasons.

Incorrect battery settings
The following parameter(s) will have an effect on the state of charge calculations if they have been set up incorrectly:

• Battery capacity.
• Peukert exponent.
• Charge efficiency factor.

Incorrect state of charge due to a synchronization issue:
The state of charge is a calculated value and will need to be reset (synchronized) every now and then. The synchronization process is automatic and is performed each time the battery is fully charged. The battery monitor determines that the battery is fully charged when all 3 “charged” conditions have been met. The “charged” conditions are:

• Charged voltage (Voltage).
• Tail current (% of battery capacity).
• Charge detection time (minutes).

A practical example of the conditions that need to be met before a synchronization will take place:

• The battery voltage has to be above 13.8V.
• The charge current has to be less than 0.04 x battery capacity (Ah). For a 200Ah battery, this is 0.04 x 200 = 8A.
• Both above conditions have to be stable for 3 minutes.

If the battery is not fully charged or if the automatic synchronization does not happen, the state of charge value will start to drift and will eventually not represent the actual state of charge of the battery.

The following parameter(s) will affect automatic synchronisation if they have been set incorrectly:

• Charged voltage.
• Tail current.
• Charged detection time.
• Not occasionally fully charging the battery.

For more information on these parameters see the chapter: “Battery settings”.

Incorrect state of charge due to incorrect current reading:
The state of charge is calculated by looking at how much current flows in and out of the battery. If the current reading is incorrect, the state of charge will also be incorrect. See paragraph Incomplete current reading [26].

State of charge always shows 100%
One reason could be that the negative cables going in and out of the battery monitor have been wired the wrong way around, see Charge and discharge currents are inverted [26].

State of charge does not reach 100%
The battery monitor will automatically synchronise and reset the state of charge to 100% as soon as the battery has been fully charged. In case the battery monitor does not reach a 100% state of charge, do the following:

• Fully charge the battery and check if the battery monitor correctly detects if the battery is fully charged.
• If the battery monitor does not detect that the battery has been fully charged you will need to check or adjust the charged voltage, tail current, and/or charged time settings. For more information see Automatic Synchronization.

The state of charge does not increase fast enough or too fast when charging
This can happen when the battery monitor thinks the battery is bigger or smaller than in reality. Check if the battery capacity has been set correctly.

The state of charge is missing

• This means that the battery monitor is unsynchronised. This can occur when the battery monitor has just been installed or after it has been unpowered for some time and is being powered up again.
• To fix this, fully charge the battery. Once the battery is close to a full charge, the battery monitor should synchronise automatically. If that doesn’t work, review the synchronization settings.

Synchronisation issues
If the battery monitor does not synchronise automatically, one possibility could be that the battery never reaches a fully charged state. Fully charge the battery and see if the state of charge eventually indicates 100%.
Another possibility is that the charged voltage setting [21] should be lowered and/or the tail current setting [21] should be increased.

It is also possible that the battery monitor synchronizes too early. This can happen in solar systems or in systems that have fluctuating charge currents. If this is the case change the following settings:

• Increase the “charged voltage [21]” to slightly below the absorption charge voltage. For example: 14.2V in case of 14.4V absorption voltage (for a 12V battery).
• Increase the “charged detection time [21]” and/or decrease the “tail current [21]” to prevent an early reset due to passing clouds.

GX device issues
This chapter only describes the most common issues. If this chapter does not solve your issue, consult the manual of the GX device.

Incorrect CAN-bus profile selected
Check that VE.Can is set to use the correct CAN-bus profile. Navigate to settings/services/VE.Can port and check if it is set to “VE.Can and Lynx Smart BMS 250kb.

RJ45 terminator or cable issue

• VE.Can devices connect in a “daisy chain” to each other The RJ45 terminator needs to be used with the first and last device in the chain.
• When connecting VE.Can the device always use “manufactured” RJ45 UTP cables? Do not manufacture these cables yourself. Many communication and other seemingly unrelated product issues are caused by faulty homemade cables.

Warranty

This product has a 5-year limited warranty. This limited warranty covers defects in materials and workmanship in this product and lasts for five years from the date of the original purchase of this product. To claim warranty the customer must return the product together with the receipt of purchase to the point of purchase. This limited warranty does not cover damage, deterioration, or malfunction resulting from alteration, modification, improper or unreasonable use or misuse, neglect, exposure to excess moisture, fire, improper packing, lightning, power surges, or other acts of nature. This limited warranty does not cover damage, deterioration, or malfunction resulting from repairs attempted by anyone unauthorized by Victron Energy to make such repairs. Non-compliance with the instructions in this manual will render the warranty void. Victron Energy is not liable for any consequential damages arising from the use of this product. The maximum liability of Victron Energy under this limited warranty shall not exceed the actual purchase price of the product.

Technical specifications Lynx Shunt VE.Can

Power

Supply voltage range| 9 – 70 Vdc
Supported system voltages| 12, 24 or 48V
Reverse polarity protection| No
Current rating| 1000Adc continuous

Power consumption

| 60mA @ 12V

33mA @ 24V

20mA @ 48V

Potential free alarm contact| 3A, 30Vdc, 250Vac
Connections

Busbar| M8
Fuse| M8
VE.Can| RJ45 and RJ45 terminator
Power supply connection to Lynx Distributor| RJ10 (a RJ10 cable ships with each Lynx Distributor)
Temperature sensor| Screw terminal
Relay| Screw terminal
Physical

Enclosure material| ABS
Enclosure dimensions (hxwxd)| 190 x 180 x 80mm
Unit weight| 1.4 kg
Busbar material| Tinned copper
Busbar dimensions (hxw)| 8 x 30mm
Environmental

Operating temperature range| -40°C to +60°
Storage temperature range| -40°C to +60°
Humidity| Max. 95% (non-condensing)
Protection class| IP22

Enclosure dimensions Lynx Shunt VE.Can

Neosolar spol. s r.o.

• Pávovská 5456/27a Jihlava 58601
• Tel.: +420 567 313 652
• E-mail: info@neosolar.cz
• www.neosolar.cz.

Victron Energy B.V.

• De Paal 35 | 1351 JG Almere PO Box 50016 | 1305 AA Almere | Nizozemsko
• Telefon +31 (0)36 535 97 00
• Zákaznická podpora : +31 (0)36 535 97 03
• Fax: +31 (0)36 535 97 40
• E-mail : sales@victronenergy.com
• www.victronenergy.com.

References

• Solární panely, fotovoltaika, tepelná čerpadla | www.neosolar.cz
• VRM Portal - Victron Energy
• CNNE - Littelfuse
• VE.Can to NMEA 2000 micro-C male cable - Victron Energy
• DC Distribution systems & Fuses - Victron Energy
• NMEA 2000 & MFD integration guide [Victron Energy]
• Victron GX product range [Victron Energy]
• Lynx Shunt VE.Can

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