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LG Energy Solution•RESU 10H Prime

Analysis by Marcus & Team

LG RESU 10H Prime Winter Charging Issues

Troubleshooting LG RESU 10H Prime battery not fully charging in winter. Diagnostic steps, safety warnings, and expert tips for optimal performance.

Frequently Asked Questions

•What is the ideal operating temperature range for the LG RESU 10H Prime?

The ideal operating temperature range is typically between 15°C and 30°C (59°F and 86°F). Refer to the product manual for specific details.

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

The SOH is usually displayed in the monitoring app. If not available, a qualified technician can perform a capacity test to determine the SOH.

•What are the typical signs of battery degradation in a residential energy storage system?

Reduced capacity, faster discharge rates, lower voltage under load, and increased internal resistance are common signs of battery degradation.

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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 utilizes lithium-ion battery cells managed by an integrated Battery Management System (BMS). The BMS monitors cell voltages, temperature, and current to ensure safe and efficient operation. Charging is controlled via a DC-DC converter that regulates the charging voltage and current based on the BMS commands. Low ambient temperatures impact battery internal resistance, charge acceptance rate, and electrochemical reaction kinetics. Consequently, the BMS may limit charging current or voltage to prevent cell damage at low temperatures, thereby preventing the battery from reaching 100% SOC.

Critical Safety Precautions:

Battery storage systems operate at high DC voltages. Always disconnect the DC disconnect switch before performing any maintenance or troubleshooting. Never attempt to work on live circuits. Lithium-ion batteries can pose a fire hazard if mishandled or damaged. Refer to the manufacturer's safety guidelines for proper handling and disposal procedures. All electrical work must be performed by a qualified electrician in accordance with NEC Article 690 (Solar Photovoltaic (PV) Systems) and Article 706 (Energy Storage Systems).

Step-by-Step Fix:

1

Verify ambient temperature around the battery enclosure using a calibrated thermometer. Compare readings with the BMS reported temperature via the monitoring app. Note any discrepancies.
2

Inspect the battery enclosure for proper insulation and ventilation. Ensure no obstructions impede airflow.
3

Use a multimeter to check the DC bus voltage at the battery terminals during charging. Compare this voltage with the inverter's charging voltage setting to confirm proper voltage regulation.
4

Perform a battery capacity test according to the manufacturer's instructions using the service menu (qualified personnel only). Note: This requires specific training and access to diagnostic tools.
5

Check the communication link between the inverter and the battery using the monitoring app or a communication analyzer. Verify that all relevant parameters are being transmitted correctly.
6

Contact a qualified LG Energy Solution technician to recalibrate the BMS if necessary. This may involve updating the firmware or adjusting the SOC estimation parameters.
7

Review the inverter and battery warranty documentation to determine coverage for capacity degradation or component failure.

Expert Tip:

Many inverters and BMS systems have a "cold weather charging" setting that can be enabled to optimize charging performance in low temperatures. Consult the inverter and battery manuals for instructions on how to access and configure this setting. Be cautious using service menus, as improper configuration can void warranties or damage the system.

Possible Causes:

Low ambient temperature impacting battery performance and BMS charge limits.
Incorrect temperature sensor readings within the battery module.
BMS calibration drift leading to inaccurate SOC estimation.
Degraded cell capacity reducing the battery's ability to reach full charge.
Inadequate insulation or heating around the battery enclosure in cold climates.
Communication issues between the inverter and the battery, preventing optimal charge control.

Prevention:

Regularly monitor the battery's SOC and SOH via the monitoring app
Perform periodic capacity tests (every 1-2 years) to track battery degradation
Ensure the battery enclosure is properly insulated and ventilated to maintain optimal operating temperature
Keep the system firmware up to date to benefit from performance enhancements and bug fixes
Check for any error codes or alerts in the monitoring system and address them promptly