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LG Energy Solution•RESU 10H Prime

Analysis by Marcus & Team

LG RESU 10H Prime Not Discharging Problem

Troubleshoot an LG RESU 10H Prime not discharging during peak demand. Diagnose common causes & solutions for residential battery storage issues.

Frequently Asked Questions

•What is the typical lifespan of an LG RESU 10H Prime battery?

The expected lifespan is generally 10 years or a specified number of charge/discharge cycles, depending on usage and environmental conditions. Consult the LG Energy Solution warranty documentation for specific details.

•How do I check the State of Health (SOH) of my LG RESU 10H Prime?

The SOH is typically accessible through the LG Energy Solution monitoring app (if available) or the inverter's monitoring interface. The SOH indicates the remaining capacity of the battery relative to its original capacity.

•What are the recommended operating temperature ranges for the LG RESU 10H Prime?

The recommended operating temperature range for the LG RESU 10H Prime is typically between -10°C and 50°C (14°F and 122°F). Extreme temperatures can negatively impact battery performance and lifespan.

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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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Technical Overview:

The LG RESU 10H Prime integrates a lithium-ion battery pack with a Battery Management System (BMS) and DC-DC converter for interfacing with a compatible inverter. The BMS monitors cell voltages, current, and temperature, controlling charging/discharging within safe operating limits. Discharge is initiated by the inverter based on grid conditions, time-of-use schedules, or power outage detection. Communication protocols (e.g., CAN bus) enable data exchange between the BMS, inverter, and monitoring portal. The system is designed to prioritize self-consumption of stored energy to reduce grid reliance and provide backup power.

Pro Tip:

Some inverters have a "forced discharge" or "test discharge" mode accessible through the service menu. Activating this mode can bypass normal discharge restrictions and help diagnose communication or configuration issues preventing regular discharge. Use with caution and monitor battery parameters closely.

Symptoms:

The LG RESU 10H Prime battery system fails to discharge during scheduled peak electricity rate periods or backup power events, preventing energy arbitrage and/or backup power functionality.

Possible Causes:

BMS fault preventing discharge due to perceived cell imbalance or over-temperature condition.
Inverter configuration error preventing discharge initiation based on time-of-use settings or grid status.
DC disconnect switch inadvertently open, interrupting the DC power flow from the battery to the inverter.
Communication failure between the BMS and inverter, causing the inverter to ignore discharge requests.
Insufficient State of Charge (SOC) to meet discharge requirements due to prior charge cycle issues or high standby losses.
Firmware incompatibility between the RESU 10H Prime and the connected inverter.

Safety Warning:

High DC voltage is present within the LG RESU 10H Prime and associated wiring. Always disconnect the DC disconnect switch and AC breaker before performing any troubleshooting or maintenance. Wear appropriate personal protective equipment (PPE), including insulated gloves and safety glasses. Work should be performed by a qualified electrician familiar with battery storage systems and NEC Article 706 requirements. Thermal runaway is a potential hazard; if smoke or fire is present, evacuate the area immediately and contact emergency services.

Solution:

1

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

Inspect the inverter's configuration settings for time-of-use schedules, grid export limits, and backup power thresholds. Correct any misconfigurations using the inverter's setup interface.
3

Use the LG Energy Solution monitoring app (if available) or the inverter's monitoring interface to check the battery's State of Charge (SOC), State of Health (SOH), cell voltages, and temperature readings. Record any abnormal values.
4

Cycle the AC breaker for the inverter and the DC disconnect switch for the battery to reset the system and clear any temporary faults.
5

Check the communication cables (e.g., CAN bus) between the RESU 10H Prime and the inverter for loose connections or damage. Re-seat or replace cables as needed.
6

Using the inverter manufacturer's specified procedure, check for and apply any available firmware updates for both the inverter and the LG RESU 10H Prime, if supported.
7

Consult with a qualified electrician to perform a load test on the battery to assess its discharge capacity and identify any cell degradation issues. Reference NEC 706.20 for ESS testing requirements.

Maintenance Tips:

Schedule regular system maintenance, including visual inspections of wiring, connections, and battery enclosure
Monitor battery performance data (SOC, SOH, cell voltages, temperature) through the monitoring portal
Perform periodic capacity tests to detect degradation early
Apply firmware updates as released by LG Energy Solution and the inverter manufacturer
Calibrate the BMS according to manufacturer's recommendations