R48-100LFP ESS Trouble Shooting

Modified on Mon, 29 Jun at 2:46 PM

TROUBLESHOOTING

Appendix C lists some of the common errors that may occur during normal operation. When the alarm indicator in ON, the type of error can be identified by referring to the Status Indicator Instructions section. In a closed loop configuration, the error information will be sent to the inverter over the applicable communication bus.

Appendix C: Troubleshooting Reference

Problem	Troubleshooting	Solution
Unable to start
Power switch ON, RUN Indication OFF.	Power on battery and press RESET 6s to observe whether the battery can be started. Charge the battery with an external charger or inverter to provide 54~57.6V. Monitor to determine if it can be started.	The battery will return to normal working condition after charging.
Unable to charge
The battery cannot be charged even though it is not fully charged.	Confirm that the battery is turned on (check rear panel, breaker, and ☼ button). Check the power cable. Confirm that the power cables are correctly connected, and the charging circuit is correct. Check the battery indicator LED to see if the battery is under Protection state. If so, unplug the battery power cable, find the cause of the protection, and fix the problem, then restart the battery. Check if the charging voltage meets the battery charging requirements. If not, adjust the power supply voltage to the proper range.	If the battery still does not charge properly after following the steps, please contact the local reseller or contact support at Rolls Battery.
Unable to discharge
The battery is full but cannot be discharged properly.	Confirm that the battery is turned on (check rear panel, breaker, and ☼ button). Check the power cables to ensure that they are properly connected (confirm there is no short circuit, reverse polarity, or other dangerous condition). Unplug the battery power cable and measure the battery power output voltage. If the battery voltage is too low, charge it immediately. Check the battery indicator LED to see if the battery is under a Protection state. If so, unplug the battery power cables, find the cause of the protection, and fix the problem, then restart the battery.	If the battery still does not charge properly after following the steps, please contact the local reseller or contact support at Rolls Battery.

Fault Indication in ON
The ALARM indicator is constantly red, other indicators are off.	Check the power cables to ensure that they are properly connected. Check whether the charging voltage, charging/discharging current, battery/cell voltage and temperature meet the relevant protection conditions and release the “protection” state to ensure that the voltage, current and temperature are within the normal working range. Check the fault information on the inverter application or battery display. Ask your supplier to offer BMS monitoring software to locate the reason and back to them for solution.	If the battery protection state cannot be released, or the ALM indicator is constantly on when the battery is properly charged after it is restarted, please contact your reseller or support.
Communication FAIL
The Inverter cannot connect to the battery and receive parameters over CAN bus or RS-485	Check the communication cable pinout is correct. Conduct a continuity check on the cable to ensure the cables have a stable connection to the port. Ensure there is no dust or contaminants in the ports on the batteries. Check the DIP switch settings are correct. Check the inverter protocol setting is correct on the inverter itself. Check both battery and inverter are working properly and are not impacted by other alarms.	If the battery protection state cannot be released, or the ALM indicator is constantly on when the battery is properly charged after it is restarted, please contact your reseller or support.

Note: If the abnormal status remains after following the above steps, please contact Rolls Battery Support.

Note: If there is any other situation(s) not covered by this table, turn off the fault battery, and refer to this and the accompanying installation guide. If the issue is still not covered, please contact Rolls Battery Support.

Q1: Why does my battery SOC reach 98–99% but never hits 100% during daily cycling?

This is normal and does not negatively impact capacity. The BMS typically calibrates to 100% only when the cut-off current is reached or a High Voltage Protection (HVP) trigger occurs. To prevent overcharging and extend cycle life, the charging profile slows down near full capacity. To calibrate the SOC to 100%, please allow the battery to "float" (remain on the charger) for 0.5 to 1 hour per parallel battery.

Q2: I am seeing "High Voltage" or "Cell Imbalance" alarms. Is my battery damaged?

No. This is common with new batteries that haven't been fully balanced yet. To resolve this, slightly lower your maximum charge voltage (e.g., to 54.6V) and allow the battery to float using an available charging source. If the alarm persists after several cycles consistent with float recommendations in the charging section above, please contact Rolls Battery Technical.

Q3: When multiple batteries are connected in parallel, the last battery in the string won't fully charge. Why?

This is usually due to voltage drop across the cabling. Ensure you are following the wiring diagrams in the manual. Always use appropriately sized cables and ensure cable pairs (positive and negative) are of equal length. For best results, use a busbar or pull positive from the first battery and negative from the last battery.

Q4: Why does the display show 0A even when a small load is connected to my parallel batteries?

Most BMS units have a detection threshold of approximately 0.5A (~25W). If the load is lower than this threshold, the BMS may not register or report the current, leading to an inaccurate real-time display.

Q5: Why is my SOC inaccurate or "jumping" to 100% suddenly during charging?

This typically occurs in off-grid systems where the SOC hasn't been calibrated for a long time, or in scenarios with very small loads (see Q4) or long-term storage. To fix this, we recommend performing a full charge once per month to allow the BMS to re-calibrate (refer to Q1).

Q6: My inverter log shows an "Internal Failure" warning, but the system is still running. What does this mean?

This warning indicates that one or more battery modules have lost communication with the system. The system is designed to continue operating but will derate (reduce power output) until communication is restored and the module is back online.

Q7: Why is my inverter pulling power from the Grid to charge the batteries while in "Self-Consumption" mode?

When the battery reaches a critically low State of Charge (SOC), it sends a formal charge request to the inverter to prevent damage. To avoid grid-charging, please adjust your settings to ensure the Depth of Discharge (DOD) stays within the manual's recommended limits.