solarMD SS4074-11 Advanced Lithium-Ion Battery Instruction Manual

: June 5, 2024
: solarMD

solarMD SS4074-11 Advanced Lithium-Ion Battery

Introduction

This manual is intended to provide assistance to an installer for the installation and commissioning of the range of Solar MD Lithium Ion phosphate (LiFePO4) energy storage solutions.

Product Description

The SS4074-11 battery solution is available in one standard size and can be paralleled to meet most residential applications. The rated voltage is 51.2V nominal (to suit 48V systems). Larger systems are provided by Solar MD based on specific project requirements.
WARNING: Read the entire document before installing or using the Solar MD battery. Failure to comply with the instructions or warnings in this document could result in electrical shock or serious injury that can result in death or damage to the product that can render the SS4074 Solar MD battery inoperable.

Product Specifications

All SS4074-11 specifications & descriptions contained in this document are verified to be accurate at the time of printing. Solar MD reserves the right to make any product revisions & improvements at any time.

Errors or Inaccuracies

To communicate any inaccuracies, omissions or to provide general feedback regarding this manual, send an email to info@solarmd.co.za

Copyrights

All information in this document is subject to the copyright of Solar MD (Pty) Ltd. Additional information is available upon request.

Safety Information

This manual contains important instructions and warnings that must be followed when using SS4074-11.
Read all instructions before installing and using the SS4074-11.

Warnings

Use SS4074-11 only as instructed.
For communication and other information please read the BMS manual.
Do not attempt to disassemble, repair, modify, or tamper with this battery unit.
Do not insert foreign objects into any part of battery unit.
Avoid exposure to any moisture.
Do not expose to extreme temperatures.
Do not drill any holes into the box.
Use only an approved Solar MD installer to install this product.
Failure to comply will void the warranty

Specification

Solar MD 7.4kWh SS4074-11 specification

/200

Mechanical installation

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig2

Please use the correct mounting screws for the correct wall surface. Screw heads should not be larger than 16mm in diameter. The Battery is only to be installed in an upright position. The maximum allowed tilt is 30 degrees.

Installing bottom cover plate

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig4

The Battery comes with two covers for single out or double out on both sides of the battery. Use the 1 or 2 way out cover plate and fix it with the two M5x6 bolts provided in the box.

Electrical installation

Step 1. Before connecting anything be sure that the battery ON/OFF switch is at OFF position. (fig4 pos 3)
WARNING
Connecting Inverters/chargers/UPS to the battery unit while is ON can cause big sparks due to capacitors inside the connected device. This can be harmful for people.
Connecting main battery terminal must be with correct size cable.
based on the rated current of the battery and the charger/inverter in case it is lower.
Step 2. Connect the negative cable to the battery negative busbar and positive cable to the battery positive busbar as shown in figure 5.

Switching the Battery ON

Step 1. Make sure all DC cables are tightened according specifications.
Step 2. If the battery operates in parallel with other Energy sources, make sure that the difference between battery voltage and DC bus is not more than 2.5V. If greater than 2.5V please Charge or Discharge the other source accordingly until voltage difference is in safe ranges under 2.5V.
Caution! A hot connection with difference in voltage can cause very high equalization current which can burn the fuses of the battery!
Caution! Measure the voltage of the battery before connecting the dc Cables.
Step 3. Turn the BMS board ON/OFF switch to the ON position (figure 4 pos 3).
Step 4. Connect Multipurpose button if not connected to the BMS board connector (figure 4 pos 5).
Step 5. Hold multi purpose button until the light comes on.
Warning! If the battery does not switch the main protection Contact ON in 7 sec, please check BMS board indication LED for faults. See section BMS Error and Warnings.

Multicolor multipurpose button

Button functions

The new Solar MD Multipurpose button has an extended functionality in combination with the BMS-EX.
The Multipurpose Button can be used to directly execute 6 predefined functions and a shutdown instruction. In combination with the 6 Indication LEDs on BMS-EX, the user can choose between each function by
holding the button until the LED count matches the number of the function. By releasing the button while moving through the functions, the LEDs will start blinking and wait for the user to press the button again within 3
seconds.
The predefined functions are:
1. Reserved
2. Change indication LED function between: Show Capacity, Show Current, and Off
3. Reserved
4. Wake up if Sleep mode is active
5. Activate Override Off state for 60sec
6. Activate Override On state for 60sec
If the button is held continuously after function 6, shutdown mode is activated and the battery will send a signal to switch off in 4sec.
Further holding the button causes the BMS to delay complete shutdown for a maximum of 3 minutes. This operation is used when the technician wants to continue read or write parameters after shutdown.

Button indication

Access to all features in future development
- The Multipurpose button advanced indication functionality, allows the user to choose between 5 different states. Mixed combinations are also allowed when a combination of multiple batteries with BMS-EX are used. The User can change the prefered stage by logging into their mypower24 Energy Portal and go to the Battery Settings.

Illumination off

For future development
- When this state has been selected, the button serves as an on/off switch without illumination (fixed colour).

Color based on capacity
When this state has been selected, the button shows static illumination in a color based on the state of charge. From RED at 0% SoC (State of Charge) to GREEN at 100% state of charge.

Color based on capacity with current direction based on shading.

For future development
- When this state has been selected, the button shows flashing illumination in a color based on the state of charge and flashing code based on the electrical current direction (charge / discharge). From RED at 0% SoC (State of Charge) to GREEN at 100% state of charge. The flashing code for charge goes through illumination interruption for 1 interval and slow illumination into the color based on the SoC for 5 intervals. The flashing code for discharge represents the opposite from charge – study color for 1 interval and slow loss of color following illumination interruption. Solar MD users refer for both as charging / discharging waves.

Fixed color with current direction based in shading

For future development
- When this state has been selected, the button shows illumination in a color based on the user choice and flashing code based on the electrical current direction (charge / discharge). The flashing code for charge goes
  through illumination interruption for 1 interval and slow illumination for 5 intervals. The flashing code for discharge represents the opposite from charge – study color for 1 interval and slow loss of color following illumination interruption. Solar MD users refer for both as charging / discharging waves.

BMS Warnings and Errors

Method of displaying general warnings and errors:

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig8

The Status LEDs determine what the indication LEDs will show.

If the Status LED is Green the indication LEDs will show:
Battery capacity
Current flow and direction
Off
The functionality of the indication LEDs are configurable, see more on this: multifunction push button.
If the Warning LED is Orange
The indication LEDs will show the warning number in binary, which corresponds to that tabulated below in the warning register.
If the Error LED is Red
The indication LEDs will show the error number in binary, which corresponds to that tabulated below in the error register.

WARNING REGISTER

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig9

ERROR REGISTER

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig11

CANBUS connection.

Bms EX used CAN 2.0B 500000 kb. Connecting other device operating at different speed rate is not allowed. For connection please use twisted pairwires in a shielded cable to minimize RF emissions. RJ45 connections can be used for daisy chaining BMS EX together using a straight Ethernet cable. The outputa the Bms EX CAN tansceiver is galvanically isolated.

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig14

CANBUS warnings.

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig15

The Orange LED (WARN) is used to display warning for canbus only. Reading this warning is possible with pulse counting.

solarMD SS4074-11 Advanced Lithium-Ion Battery-fig16

Troubleshooting Warnings / Errors

Code	Cause	Solution

Warnings ( Figure 6)
1-2| 1. Inverter / rectifier settings may not be correct.

2. Battery cells may be disbalanced

| 1. Check the battery settings

2. Contact Solar MD support

3-4| System design is not correct.| Add additional battery, decrease charging / discharging current from

your inverter / rectifier / load

5-6| Manual override| Manual override has been activated – please check with your installer
29-30| The BMS is ready to switch on after deep discharge / charge| Connect charger / load to the Battery
Errors (Figure 7 & 8)
5,6,7| The battery is not installed in upright position| Install the battery in the right position
15,16,17| The BMS has been shut down manually or remotely| Switch on the BMS
18,19| The absolute maximum charge/discharge current has been achieved| The BMS will restart automatically, please contact support team or approved installer
21| The BMS is set for different number cells in series as the actually installed| Contact your installer or Solar MD support team
cvt22| Battery cell voltage way too low.| Fill in the failure report and send to info@solarmd.co.za

The unit needs to return to the factory for testing

23| Battery cell voltage way too high| The BMS will restart automatically after pending awake condition
24,25,26,

27,28,30,

31

| BMS Internal failure| Fill in the failure report and send to info@solarmd.co.za

The BMS will be dispatched to you for replacement

29| Battery factory failure| Fill in the failure report and send to info@solarmd.co.za

The unit needs to return to the factory for testing

CANBUS Warning (Figure 10)
1| 1. Canbus line open.

2. Single CANBUS resistor not terminated.

| 1. Check if the minimum of two nodes are connected on the line with the same transmission speed.

2. Check if single resistor is terminated via the jumper. Located top left of can LEDS(Fig 10).

Maximum charging / discharging voltages for non supported devices.

Bulk charge (stop charging) 54.6V
Float charge (if applicable) 53.8V
Low battery discharge: 48V

CONTACT

Check that the Equalisation function are disalled, then verify if there is a voltage difference on the inverter display and the battery terminals @0.3C discharge / charge current. If so adjust the values above.
Please check if your inverter charger has been approved by Solar MD and it is CAN compatible.
For the latest Solar MD installation documents go to: www.solarmd.com
To secure the full 10-year product warranty for the end user, be
sure to register your battery online – login.mypower24.co.za.