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LG Energy Solution•RESU 13

Analysis by Marcus & Team

LG RESU 13: Incorrect Solar Values on Monitoring Portal

Troubleshoot incorrect solar values displayed on the LG RESU 13 monitoring portal. Diagnose PV input, battery SOC, and communication errors. Expert tips included.

Frequently Asked Questions

•What is the DC voltage range for an LG RESU 13 battery?

The nominal DC voltage is 51.8 V, with an operational range of approximately 42-59 V.

•What is the maximum charge/discharge current for an LG RESU 13 battery?

The maximum continuous charge/discharge current is typically around 63A.

•What are the common causes of PV string underperformance?

Shading, soiling, panel degradation, and wiring issues are common causes of PV string underperformance.

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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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Symptoms:

The LG RESU 13 monitoring portal displays inaccurate solar power generation values, showing either no solar input, consistently low readings despite adequate sunlight, or fluctuating values that do not correlate with actual PV output. Battery State of Charge (SOC) may also be affected.

Important Warnings:

Solar PV systems operate at high DC voltages. Improper handling can result in severe electric shock or arc flash. Always disconnect the DC power from the PV array and battery before performing any maintenance or troubleshooting. Ensure the NEC rapid shutdown requirements are met. A qualified electrician is mandatory for all troubleshooting and repair procedures.

Solution:

1

Verify PV Array Output: Using a calibrated multimeter and clamp meter, measure the DC voltage and current of each PV string at the inverter input. Compare to expected values based on irradiance and panel specifications.
2

Check Inverter Communication: Ensure the inverter is connected to the internet and communicating with the LG monitoring portal. Check Wi-Fi signal strength or Ethernet connection.
3

Inspect DC Disconnect: Verify the DC disconnect switch between the PV array and the inverter is fully closed and functioning correctly. Check for voltage drop across the disconnect.
4

Review Inverter Settings: Using the inverter's configuration interface (following manufacturer's instructions), verify that the solar input settings are correctly configured. Incorrect settings can lead to misreporting.
5

Monitor Battery Charge Current: Observe the battery charge current reported by the BMS. Compare it to the solar power production values. A significant discrepancy suggests a BMS error.
6

Perform Inverter Reset: Cycle AC power to the inverter to force a reboot. This can sometimes resolve communication glitches. Consult the manufacturer's documentation for proper reset procedures.
7

Firmware Update: Check for and install any available firmware updates for the inverter and BMS. Firmware updates often address known bugs and improve system performance.

Possible Causes:

Inverter communication failure: The inverter is not correctly reporting solar power production to the monitoring portal.
PV array underperformance: Solar panels are producing less power than expected due to shading, soiling, or degradation.
DC Disconnect Fault: The DC disconnect between the PV array and the inverter might be partially or fully open.
Current sensor malfunction: The current sensor within the inverter that measures solar input is providing incorrect readings.
BMS error: The Battery Management System (BMS) may be misinterpreting or misreporting the solar charge current.
Firmware bug: The inverter or BMS firmware has a known issue causing incorrect solar data reporting.

Expert Tip:

Many inverters have a hidden service menu that displays real-time sensor data. Consult the inverter's service manual for the key combination or software tool required to access this menu. This can provide more detailed information about the solar input and battery charging process.

How It Works:

The LG RESU 13 system integrates with a solar PV array via a hybrid inverter. Solar DC power is converted to AC power, used to power the home, charge the battery, and/or export excess power to the grid. The inverter communicates solar production data to the monitoring portal. Communication occurs typically via Wi-Fi or Ethernet to the LG cloud servers. Data integrity is reliant on functioning PV modules, a properly configured inverter, a functional Battery Management System (BMS), and a stable network connection.

Prevention:

Regular Monitoring: Consistently monitor the solar power production values on the LG monitoring portal.
PV Array Cleaning: Periodically clean the solar panels to remove dust and debris.
Inverter Firmware Updates: Install firmware updates as they become available from the manufacturer.
Annual inspection: Schedule an annual inspection of the entire solar and storage system by a qualified electrician.