A lithium battery and solar inverter must communicate correctly to ensure that the system charges, discharges and protects the battery within its permitted operating limits.

The BLUE CARBON 15.36kWh-48V Stackable Lithium Battery with Smart BMS is designed with an intelligent Battery Management System (BMS). The BMS monitors important battery operating parameters, including voltage, current and temperature. When connected to a compatible inverter with the correct communication settings, it can help the inverter manage battery charging and discharging more effectively.

Blue Carbon

This guide explains the installation checks, communication cable connection, inverter settings and troubleshooting steps.

Product: BLUE CARBON 15.36kWh-48V Stackable Lithium Battery with Smart BMS

View the official BLUE CARBON product page

1. Understand How Battery and Inverter Communication Works

The BMS is the electronic protection and monitoring system inside the lithium battery. It monitors battery conditions and helps protect the cells against unsafe operating conditions.

Communication between the battery and inverter allows the two devices to exchange information such as:

• Battery voltage.
• Charging and discharging current limits.
• State of charge (SOC).
• Battery temperature.
• Charging and discharging status.
• Battery protection and alarm information.

Depending on the battery and inverter models, communication may use CAN or RS485.

Important: The product page confirms that this BLUE CARBON battery has Smart BMS technology, but it does not publish the exact communication protocol, connector pinout, baud rate or inverter-specific settings. These must be confirmed from the battery's technical manual or BLUE CARBON technical support. Do not assume that every RJ45 communication port uses the same wiring.

The following is a practical installation procedure. The exact communication cable, pin assignment and inverter menu names depend on the inverter model.

2. Identify the Battery and Inverter Communication Ports

Before connecting anything, inspect the communication terminals on both devices.

Common labels include:

Important distinction: The battery's CAN/RS485 communication port is not the same as its parallel communication port. Do not connect the inverter to a LINK or PARALLEL port unless the manufacturer's wiring diagram specifically instructs you to do so.

3. Prepare the Equipment Before Installation

Ensure you have the following:

• BLUE CARBON 15.36kWh-48V stackable lithium battery.
• A compatible 48V lithium solar inverter.
• Manufacturer-approved CAN or RS485 communication cable.
• Correct battery power cables.
• Appropriate DC circuit breaker or isolator.
• Insulated installation tools.
• Battery and inverter technical manuals.
• Multimeter for electrical checks.

Before starting, switch off the inverter, isolate the solar PV input, disconnect the grid or generator supply where applicable, and ensure the battery is safely isolated according to the manufacturer's shutdown procedure.

Do not connect or disconnect battery communication cables while the system is energised unless the equipment manufacturer expressly permits it.

4. Connect the Battery Power Cables

Follow these steps:

Step 1: Locate the battery's positive (+) and negative (−) power terminals.

Step 2: Identify the corresponding battery terminals on the inverter.

Step 3: Confirm that the battery voltage matches the inverter's DC battery voltage specification.

Step 4: Use correctly sized battery cables and approved DC protection.

Step 5: Connect the positive cable to the positive terminal and the negative cable to the negative terminal, following the manufacturer's connection sequence.

Step 6: Check the polarity and tighten all connections to the specified torque.

Step 7: Have a qualified installer verify the voltage and connections before energising the system.

Safety warning

Never reverse battery polarity. A wiring mistake can damage the inverter, battery or both. Do not use an ordinary AC circuit breaker as a substitute for correctly rated DC protection.

5. Connect the Battery Communication Cable

This is the most important step for enabling communication between the Smart BMS and inverter.

Follow these instructions:

Step 1: Identify the communication protocol.

Check the BLUE CARBON battery documentation to determine whether your particular battery version communicates through CAN or RS485 with your inverter.

Step 2: Identify the correct inverter communication port.

Locate the corresponding CAN or RS485/BMS port on the inverter.

Step 3: Obtain the correct communication cable.

Use the cable approved for the particular battery and inverter combination. An ordinary Ethernet cable may have the wrong pin arrangement even if its connector fits.

Step 4: Confirm the pinout.

Check the battery and inverter manuals for the exact connector pin assignments. Both ends must be wired according to the approved cable diagram.

Step 5: Connect the cable.

With the equipment safely isolated, connect the battery communication port to the inverter's designated BMS communication port.

Step 6: Secure the connection.

Check that both connectors are properly seated and that the cable is not damaged or exposed to interference.

Do not guess the RJ45 pinout or interchange CAN-H, CAN-L, RS485-A and RS485-B. Their wiring is not necessarily interchangeable.

6. Configure the Inverter Battery Settings

After connecting the communication cable, configure the inverter.

The menu names differ between manufacturers, but the general process is:

1. Switch on the battery and follow its startup procedure.
2. Switch on the inverter according to its manual.
3. Open the inverter settings menu.
4. Locate the battery type or battery configuration option.
5. Select the appropriate lithium battery or BMS communication mode.
6. Select the correct communication protocol, CAN or RS485, as confirmed for the system.
7. Select the correct battery model or protocol profile if the inverter provides one.
8. Save the settings.
9. Check whether the inverter recognises the battery.

Some inverters require you to select a particular lithium protocol number rather than simply choosing CAN or RS485.

Do not select a random lithium protocol number. An incorrect protocol can cause missing battery information or inappropriate charging and discharging limits.

7. Confirm That the Battery and Inverter Are Communicating

Once the configuration is complete, check the inverter display.

Depending on the equipment, successful communication may display:

• Battery state of charge (SOC).
• Battery voltage.
• Charging current.
• Discharging current.
• Battery temperature.
• BMS charging and discharging limits.
• Battery warning or protection status.

For example, the inverter may display a battery SOC of 75%.

This indicates that the inverter is receiving battery charge information, provided the displayed value is being supplied by the BMS rather than estimated by the inverter.

A successful communication check should also confirm that no BMS communication alarm is present.

8. Configure Multiple BLUE CARBON Stackable Batteries

One of the advantages of the BLUE CARBON battery's stackable design is the potential to expand energy storage using compatible battery units. The product page specifically states that expansion is subject to model compatibility and manufacturer specifications.

Blue Carbon

When installing multiple batteries, follow these general requirements:

1. Confirm that the battery models and firmware versions are approved for parallel operation.
2. Follow the manufacturer's instructions for power-cable connections.
3. Connect the battery communication or LINK cables using the specified topology.
4. Configure battery addresses or DIP switches if the model requires them.
5. Identify the designated master battery, if the system uses master-slave communication.
6. Connect the master battery's inverter communication port to the inverter's BMS port.
7. Confirm that the inverter recognises the combined battery bank.
8. Verify that the total charging and discharging limits are appropriate.

Important: Do not assume that all stackable battery models use the same addressing system or master-slave arrangement. The exact sequence, cable arrangement and address settings must come from the relevant BLUE CARBON manual.

9. Troubleshooting: When the Battery and Inverter Are Not Communicating

If the inverter displays a BMS communication error or fails to recognise the battery, check the following.

Additional troubleshooting checks

Check the communication cable: A cable may fit physically but still have an incorrect pin configuration.

Check the protocol: Confirm that the inverter and battery are using the same supported communication protocol.

Check the inverter firmware: Some inverter models require a compatible firmware version for specific battery protocols.

Check battery startup: Follow the manufacturer's instructions for starting individual batteries and the battery bank.

Check BMS alarms: Investigate any battery protection warnings before attempting to restart the system.

If communication remains unsuccessful, stop repeated connection attempts and request technical assistance. Do not bypass the BMS or force the inverter to charge the battery.

10. What If Your Inverter Does Not Support Battery Communication?

Some solar inverters do not support CAN or RS485 communication with a particular battery.

In this situation, voltage-based or user-defined battery operation may be possible, but only if the battery manufacturer and inverter manufacturer approve it.

The installer must obtain the correct:

• Bulk/absorption charging voltage.
• Float charging voltage, if applicable.
• Low-voltage cut-off.
• Maximum charging current.
• Maximum discharging current.
• Restart and recovery voltage.
• Battery temperature and protection requirements.

These settings must come from the exact battery and inverter manuals. Do not copy settings from another lithium battery model.

Where supported, the battery's internal BMS will continue providing cell-level protection, but the inverter may not receive live SOC, current limits or other BMS information.

11. Final Commissioning Checklist

Before handing the solar installation over to the customer, verify the following:

Installation commissioning checklist

0/12 completed

Battery model and inverter compatibility confirmed

Battery voltage and polarity verified

Battery power cables correctly installed

Correct DC protection installed

Approved CAN/RS485 communication cable used

Communication pinout verified from manuals

Correct lithium protocol selected on inverter

Battery SOC displayed correctly

Charging and discharging limits verified

No active BMS or inverter alarms

Multiple battery addressing checked, where applicable

System tested under charging and load conditions

Copy commissioning checklist

12. Important Technical Information to Confirm with BLUE CARBON

The product page confirms Smart BMS functionality, but does not publish the detailed inverter communication instructions. Before preparing a model-specific wiring diagram or installer training document, obtain confirmation of the following:

For official technical assistance, contact:

BLUE CARBON NIGERIA

• Website: https://bluecarbon.ng/
• Product: 15.36kWh-48V Stackable Battery with Smart BMS
• Telephone: 09042103985
• Email: enquires@bluecarbon.ng

Tags: Blue Carbon lithium battery inverter communication, lithium battery BMS communication, CAN communication solar inverter, RS485 lithium battery connection, Blue Carbon 15.36kWh battery