storagefaults.comstoragefaults.com

LG Energy Solution•RESU 10H Prime

Analysis by Marcus & Team

LG RESU 10H Prime Deep Discharge Failure

Diagnosing and resolving deep discharge issues in LG RESU 10H Prime battery storage systems. Learn about causes, solutions, and safety for residential installations.

Frequently Asked Questions

•What are the recommended low-voltage disconnect settings for the LG RESU 10H Prime with a SolarEdge inverter?

Consult the SolarEdge inverter manual and the LG RESU 10H Prime datasheet for compatible settings. Ensure the low-voltage disconnect is set above the minimum allowable discharge voltage of the battery.

•How can I determine if the deep discharge was caused by self-discharge or a parasitic load?

After a full charge and subsequent deep discharge event, disconnect all external loads from the battery. Monitor the battery voltage over time. If the voltage drops rapidly even without external loads, excessive self-discharge is likely. If the voltage remains stable, a parasitic load is the more probable cause.

•What is the warranty coverage for deep discharge damage on the LG RESU 10H Prime?

Refer to the LG Energy Solution warranty document for specific terms and conditions regarding deep discharge damage. Warranty coverage may be voided if the deep discharge was caused by improper installation or operation.

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

Safety Warning:

High DC voltage is present within the LG RESU 10H Prime system. Improper handling can result in serious injury or death. Never attempt to disassemble the battery module. Always follow proper lockout/tagout procedures before working on the system. Only qualified electricians should perform electrical measurements or repairs. Arc flash hazard exists; wear appropriate PPE. Ensure compliance with NEC Article 706 (Energy Storage Systems).

Step-by-Step Fix:

Technical Recommendation:

Many inverters have a configurable low-voltage disconnect setting. Verify that this setting is appropriately configured for the LG RESU 10H Prime battery specifications. Consult the inverter manual and the LG RESU 10H Prime datasheet for recommended settings. Also, check for any hidden diagnostic menus in the inverter or BMS that may provide detailed cell voltage information.

Technical Background:

The LG RESU 10H Prime is a residential energy storage system utilizing lithium-ion battery technology. The system includes a Battery Management System (BMS) which monitors cell voltages, temperature, and current. The BMS protects the battery from over-discharge, over-charge, over-current, and thermal runaway. Deep discharge occurs when the battery voltage drops below the minimum allowable voltage, potentially damaging the cells. The BMS should normally prevent this, but faults can occur. Power flow is DC from the battery to the inverter, then AC to the home or grid. Grid synchronization is required for on-grid operation. Safety systems include over-current protection, thermal monitoring, and DC disconnect.

Possible Causes:

Excessive self-discharge during prolonged inactivity.
BMS malfunction failing to prevent over-discharge.
parasitic loads draining the battery.
Inverter fault continuously drawing power from the battery even when idle.
Incorrect low-voltage disconnect setting in the inverter.
Cell imbalance leading to premature voltage drop in weaker cells.

Observed Symptoms:

The LG RESU 10H Prime battery is unresponsive and fails to power on after experiencing a deep discharge event. The inverter reports a battery fault or no communication with the battery. The system log may indicate a low voltage condition or shutdown.

Preventative Care:

Periodically check the battery SOC through the monitoring app. Avoid allowing the battery to remain at low SOC for extended periods.
Ensure the inverter firmware and BMS software are up-to-date.
Perform periodic capacity tests to monitor battery SOH.
Visually inspect the battery enclosure for proper ventilation and cleanliness.
Schedule annual licensed technician system inspections by a qualified technician.