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LG Energy Solution•RESU 16H Prime

Analysis by Marcus & Team

LG RESU 16H Prime: Battery Not Found Error

Troubleshoot 'Battery Not Found' error on LG RESU 16H Prime. Diagnostic steps, safety warnings, and expert tips for residential ESS.

Frequently Asked Questions

•What is the typical lifespan of an LG RESU 16H Prime battery?

The typical lifespan is 10 years or more, depending on usage patterns, depth of discharge, and environmental conditions. LG warranties the battery for a specific throughput capacity.

•How do I check the State of Health (SOH) of my LG RESU 16H Prime battery?

The SOH can be checked through the LG monitoring app or inverter interface. The SOH indicates the remaining capacity of the battery compared to its original capacity.

•What are the recommended operating temperature ranges for the LG RESU 16H Prime?

The recommended operating temperature range is typically between -10°C and 50°C (14°F and 122°F). Refer to the manufacturer's specifications for precise temperature limits.

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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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Safety Warning:

High DC voltage is present in battery storage systems. Do not attempt any repairs or measurements on live circuits. Always disconnect the DC disconnect switch before working on the system. Arc flash hazards exist. Qualified electricians must wear appropriate PPE. NEC 690 guidelines must be followed.

Solution:

1

Visually inspect the DC disconnect switch to ensure it is in the closed (ON) position. Use a multimeter to verify voltage across the disconnect when closed. NEC 690.15.
2

Verify DC voltage at the inverter terminals. If voltage is absent, trace wiring back to the battery disconnect and battery terminals. Ensure proper polarity.
3

Inspect the CAN bus wiring between the battery and inverter for damage or loose connections. Use a CAN bus analyzer if available.
4

Check all accessible fuses within the battery pack and inverter using a multimeter in continuity mode. Replace any blown fuses with the exact same rating.
5

Using the inverter's monitoring app or interface, check for any BMS error codes. Consult the LG RESU 16H Prime troubleshooting guide.
6

Update the inverter firmware to the latest version, following the manufacturer's instructions. This often resolves communication compatibility issues.
7

If the problem persists, contact a qualified electrician or LG Energy Solution service technician for further diagnosis and repair.

Expert Tip:

The LG RESU 16H Prime has a service mode that can be accessed through a specific key combination on the inverter interface. This mode allows access to detailed BMS data and diagnostic logs. Consult the service manual for the correct key combination and procedures. This data can reveal underlying cell imbalance or communication faults.

Possible Causes:

DC Disconnect Switch: The DC disconnect switch between the battery and inverter is open or faulty.
CAN Bus Communication Failure: A break or short in the CAN bus wiring between the battery and inverter.
Blown Fuse: A fuse within the battery pack or inverter has blown, interrupting power or communication.
BMS Failure: The Battery Management System (BMS) has failed to initialize or is reporting a critical fault.
Wiring Issues: Loose or corroded DC wiring connections between the battery and the inverter. Verify polarity.
Inverter Firmware: Outdated inverter firmware incompatible with the battery BMS.

Symptoms:

The LG RESU 16H Prime battery energy storage system (ESS) is reporting a 'Battery Not Found' error, preventing normal operation and backup power functionality. The inverter may display an error code or warning message related to the battery connection.

Technical Background:

The LG RESU 16H Prime is a 400VDC nominal lithium-ion battery pack. The battery communicates with the inverter via a CAN bus. The Battery Management System (BMS) monitors cell voltages, temperature, SOC, and SOH. The inverter requires valid BMS data to operate. Loss of communication, a tripped DC disconnect, or BMS fault can trigger the 'Battery Not Found' error. The system relies on robust DC power transfer for charging/discharging.

Prevention:

Schedule regular (annual) system inspections by a qualified technician
Check DC wiring connections for tightness and corrosion
Monitor the battery's SOC and SOH via the monitoring app
Ensure the inverter firmware is up to date
Log any unusual system behavior