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LG Energy Solution•RESU 10H Prime

Analysis by Marcus & Team

LG RESU 10H Prime Deep Discharge Wake-Up Failure

Troubleshoot LG RESU 10H Prime battery not waking up after deep discharge. Check voltage, BMS, and follow safe restart procedures. NEC compliance is key.

Frequently Asked Questions

•What is the minimum allowable voltage for the LG RESU 10H Prime?

Consult the LG RESU 10H Prime datasheet for the minimum allowable discharge voltage. Exceeding this limit can damage the battery.

•How do I reset the BMS on the LG RESU 10H Prime?

The BMS reset procedure varies depending on the inverter model. Refer to the LG RESU 10H Prime installation manual and the inverter manual for specific instructions. Contact LG Energy Solution support for assistance if needed.

•What are the signs of a damaged lithium-ion battery?

Signs of a damaged lithium-ion battery include swelling, discoloration, leaking electrolyte, excessive heat generation, and a strong chemical odor. Immediately disconnect the battery and contact a qualified technician if any of these signs are present.

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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.

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Possible Causes:

The battery voltage has fallen below the minimum allowable discharge voltage threshold set by the BMS.
The BMS has entered a protective shutdown mode due to a prolonged deep discharge state.
There is a communication failure between the inverter and the BMS preventing a wake-up signal from being sent.
Internal cell damage occurred due to the deep discharge, preventing the battery from accepting a charge.
The DC disconnect switch is open or has a faulty connection preventing voltage from reaching the inverter.
The BMS firmware is corrupted or requires an update to address deep discharge recovery.

Technical Overview:

The LG RESU 10H Prime is a lithium-ion battery energy storage system (ESS). It integrates with a solar inverter to store excess solar energy for later use. The Battery Management System (BMS) monitors cell voltages, temperature, and current. The BMS protects the battery from over-discharge, over-charge, over-current, and thermal runaway. A deep discharge can cause the BMS to shut down the battery to prevent cell damage. Waking up the battery requires a specific voltage threshold or a reset command from the inverter or BMS.

Observed Symptoms:

The LG RESU 10H Prime battery storage system fails to power on or resume operation after experiencing a deep discharge event. The inverter reports a battery communication error or low voltage fault. The battery indicator lights may be off or flashing an error code. No output voltage from the battery is measurable at the DC disconnect.

Important Warnings:

Lithium-ion batteries pose a risk of thermal runaway and fire if mishandled. High DC voltages present a shock hazard. Only qualified electricians should perform diagnostic and repair procedures on the LG RESU 10H Prime. Always disconnect the DC power before working on the system. Comply with all applicable NEC codes and manufacturer safety guidelines. Wear appropriate personal protective equipment (PPE), including insulated gloves and safety glasses.

Solution:

1

Verify the DC disconnect switch is closed and functioning correctly using a multimeter to measure voltage across the terminals.
2

Measure the battery voltage at the DC terminals using a calibrated multimeter. A severely low voltage (below 40V) indicates a deep discharge state requiring specialized recovery.
3

Consult the LG RESU 10H Prime system manual for the recommended deep discharge recovery procedure. This may involve a specific charging sequence or BMS reset command.
4

Use a CAN bus analyzer to monitor communication between the inverter and the BMS. Verify that wake-up commands are being sent and received.
5

If the battery voltage is critically low and the BMS is unresponsive, contact LG Energy Solution technical support for assistance. Do not attempt to charge the battery directly without proper authorization and safety precautions.
6

Check the inverter error logs for specific fault codes related to the battery. Clear the faults after resolving the underlying issue.
7

Document all voltage measurements, error codes, and troubleshooting steps taken for warranty purposes.

Preventative Care:

Avoid allowing the LG RESU 10H Prime to remain in a deeply discharged state for extended periods
Monitor the battery SOC regularly using the monitoring app and adjust system settings to prevent excessive discharge
Schedule regular maintenance to inspect the battery terminals for corrosion and ensure proper ventilation
Update the BMS firmware as recommended by LG Energy Solution