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LG Energy Solution•RESU 6.5

Analysis by Marcus & Team

LG RESU 6.5 Battery Not Found Error

Troubleshoot an LG RESU 6.5 'Battery Not Found' error. Learn diagnostic steps, safety precautions, and expert tips for residential energy storage systems.

Frequently Asked Questions

•What are the typical causes for voltage imbalance in LG RESU batteries?

Causes include cell degradation, thermal gradients, and BMS calibration issues.

•How often should I perform a visual inspection of my LG RESU 6.5 battery?

At least annually, or more frequently if you notice any performance issues.

•What is the expected lifespan of an LG RESU 6.5 battery?

Typically 10 years, depending on usage patterns and environmental conditions.

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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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Pro Tip:

Many inverters have a service menu accessible via a specific key combination or a dedicated installer app. This menu often provides detailed diagnostic information, including communication status, cell voltages, and error logs. Refer to the inverter manual for instructions on accessing the service menu.

Safety Warning:

High DC voltage is present within the battery system and inverter. Improper handling can result in electric shock or arc flash. Always disconnect both AC and DC power before performing any maintenance or troubleshooting. Only qualified electricians should work on the system. Adhere to NEC Article 690 (Solar Photovoltaic Systems) and Article 706 (Energy Storage Systems).

Step-by-Step Fix:

1

*Safety First**: Disconnect AC power to the inverter using the AC disconnect. Then, open the DC disconnect switch between the RESU 6.5 and the inverter. Wait 5 minutes to allow capacitors to discharge.
2

*Visual inspection**: Check all wiring connections between the RESU 6.5 and the inverter for tightness and corrosion. Ensure the DC disconnect switch is fully functional.
3

*Voltage Check**: Using a multimeter, verify DC voltage at the battery terminals of the inverter after the DC disconnect. Should read close to zero. Then, check the DC voltage at the battery terminals within the RESU 6.5 enclosure. Should read around 51.8V (nominal).
4

*Communication Test**: Consult the inverter and battery manuals for specific CAN bus or RS485 communication troubleshooting steps. Use a CAN bus analyzer (if available) to check for communication activity between the devices.
5

*Firmware Update**: Check for firmware updates for both the inverter and the LG RESU 6.5. Update the firmware according to the manufacturer's instructions. Incompatible firmware can cause communication issues.
6

*BMS Reset**: Attempt a BMS reset following the manufacturer's instructions. This might require accessing a service menu or using a specific key combination on the battery.
7

*Qualified Electrician**: If the problem persists, contact a qualified electrician or LG Energy Solution certified installer for further diagnosis and repair. Do not attempt repairs beyond your skill level. NEC 706 covers energy storage systems.

Why This Happens:

CAN bus or RS485 communication failure between the battery and inverter.
DC disconnect switch is open or faulty, interrupting power to the inverter.
BMS failure within the LG RESU 6.5.
Inverter communication port failure.
Firmware incompatibility between the inverter and battery.
Loose or corroded wiring connections.

Technical Overview:

The LG RESU 6.5 communicates with the inverter via a CAN bus or RS485 interface. The BMS (Battery Management System) within the RESU monitors cell voltages, temperature, SOC, and SOH. DC power from the battery is converted to AC power by the inverter for household use or grid export. Proper communication between the inverter and the BMS is crucial for system operation and safety. The inverter monitors battery voltage and current via the communication link. Loss of communication will shut down the system.

Observed Symptoms:

The LG RESU 6.5 battery system is not recognized by the inverter or monitoring system. The inverter displays a "Battery Not Found" error. System is unable to provide backup power or store solar energy.

Maintenance Tips:

Schedule annual system inspections by a qualified technician.
Regularly check for firmware updates for the inverter and battery.
Monitor battery performance data (SOC, SOH, cell voltages) through the monitoring app.
Ensure proper ventilation around the battery system to prevent overheating.
Perform a capacity test every 2-3 years to assess battery degradation.