storagefaults.comstoragefaults.com

LG Energy Solution•RESU 13

Analysis by Marcus & Team

LG RESU 13 Error Code 31 Troubleshooting

Troubleshoot LG RESU 13 Error Code 31. Diagnose battery system faults and restore residential energy storage functionality. Safe and reliable solutions.

Frequently Asked Questions

•What is the typical DC voltage range for the LG RESU 13?

The typical DC voltage range for the LG RESU 13 is between 48V and 56V.

•What type of PPE should I use when working on the LG RESU 13?

When working on the LG RESU 13, always wear insulated gloves, eye protection, and appropriate arc flash rated clothing.

•Where can I find the LG RESU 13 installation manual and troubleshooting guide?

The LG RESU 13 installation manual and troubleshooting guide can be found on the LG Energy Solution website or through your authorized installer.

Related questions

Loading related questions...

Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

← Back to list

Technical Overview:

The LG RESU 13 integrates a lithium-ion battery pack with a Battery Management System (BMS), DC-DC converter, and communication interfaces. The BMS monitors cell voltages, currents, and temperatures, enforcing charge/discharge limits to protect the battery. Error Code 31 signals that the BMS has detected a current exceeding safe operational parameters, triggering a protective shutdown. The DC bus voltage between the battery and inverter is a critical factor.

Common Causes:

Faulty current sensor within the BMS, providing inaccurate readings.
Inverter malfunction causing excessive charging or discharging current.
Overload due to excessive AC load demand during discharge.
Damaged battery cells exhibiting increased internal resistance, leading to higher current draw.
Communication failure between the inverter and the RESU 13, resulting in incorrect current commands.
Software glitch within the BMS leading to incorrect current limit settings.

Pro Tip:

Some LG RESU models have a hidden service menu accessible via a specific sequence on the front panel LEDs. This menu may provide detailed diagnostic information, including cell voltages and current sensor calibration values. Refer to the LG service manual for the specific access procedure. Be extremely cautious when using service menus and only change settings if you fully understand their impact.

What to Look For:

The LG RESU 13 battery storage system is displaying Error Code 31. This typically indicates an overcurrent fault during charging or discharging, leading to system shutdown and preventing normal operation. Observed voltage and current limits are exceeded based on BMS logs.

Critical Safety Precautions:

The LG RESU 13 operates at high DC voltage, posing a significant electrical shock hazard. Do not attempt to service the battery system unless you are a qualified electrician with experience working on battery storage systems. Always follow proper lockout/tagout procedures before working on any electrical components. Wear appropriate personal protective equipment (PPE), including insulated gloves and eye protection. Consult NEC Article 690 for solar photovoltaic (PV) systems, specifically rapid shutdown requirements. Improper handling of lithium-ion batteries can lead to thermal runaway and fire.

Recommended Action:

1

Disconnect the AC power to the inverter and then open the DC disconnect switch for the LG RESU 13 battery system per NEC 690.13.
2

Use a calibrated multimeter to check the DC bus voltage at the battery terminals, verifying it is within the expected range (typically 48-56V DC). Record the voltage.
3

Inspect the wiring between the inverter and the RESU 13 for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.
4

Use a clamp meter to measure the charging and discharging current at the battery terminals during a test cycle (if possible after a system reset). Compare the measured values with the inverter's specifications. Use caution and appropriate PPE.
5

Review the inverter's error logs for related faults or warnings. Note any simultaneous error codes.
6

Consult the LG Energy Solution RESU 13 system manual and troubleshooting guide for specific procedures related to Error Code
7

Contact LG technical support for assistance if needed.
8

If all other checks fail, suspect a faulty BMS. Replacement of the battery pack may be necessary, performed by a qualified installer.

Preventative Care:

Regularly inspect the battery system for any signs of physical damage or corrosion
Schedule periodic maintenance with a qualified technician, including BMS firmware updates and capacity testing
Ensure proper ventilation around the battery system to prevent overheating
Monitor the system's performance through the monitoring app, paying attention to voltage, current, and temperature readings
Consider a load analysis to ensure the system is not being overloaded