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LG Energy Solution•RESU 13

Analysis by Marcus & Team

LG RESU 13: Moisture or Condensation Inside Cabinet

Diagnose moisture/condensation inside LG RESU 13 battery cabinet. Causes, solutions, safety, and expert tips for residential energy storage systems.

Frequently Asked Questions

•What are the voltage ranges for a healthy LG RESU 13 battery?

A healthy LG RESU 13 battery should have a voltage range between 51.8 V and 56.7 V. Individual cell voltages should be within 0.05V of each other.

•How do I properly disconnect the LG RESU 13 for inspection?

First, turn off the AC breaker connected to the inverter. Then, locate and disconnect the DC disconnect switch between the battery and the inverter. Follow the manufacturer's guidelines for proper shutdown procedures.

•What type of sealant should I use to reseal the LG RESU 13 cabinet?

Use a weatherproof silicone sealant that is specifically designed for electrical enclosures. Ensure that the sealant is compatible with the materials of the cabinet and seals to prevent any chemical reactions.

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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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Expert Tip:

Check the LG RESU 13's error log history in the monitoring app. Temperature sensors may indicate abnormal readings preceding the moisture detection. A sudden drop in reported internal temperature followed by a "Moisture Detected" error is a strong indicator of condensation.

Critical Safety Precautions:

Moisture inside the battery cabinet poses a significant electrical hazard. High DC voltages are present, creating a risk of shock, arc flash, and fire. Do not attempt to repair or disassemble the battery pack yourself. Contact a qualified electrician experienced in battery storage systems. Ensure compliance with NEC Article 706 regarding energy storage systems and rapid shutdown requirements. Always disconnect DC sources before AC sources during maintenance. Never work on live circuits.

Recommended Action:

1

*Safety First**: Disconnect the LG RESU 13 from both the AC and DC sides following NEC rapid shutdown procedures. Use appropriate Personal Protective Equipment (PPE), including insulated gloves and eye protection. A qualified electrician is mandatory for this step.
2

*Visual inspection**: Carefully inspect the entire cabinet for any signs of damage, cracks, or compromised seals. Pay close attention to cable entry points and ventilation openings.
3

*Moisture Source Identification**: Identify the source of the moisture. Check for leaks from nearby plumbing, roof issues, or condensation due to temperature differences. Use a moisture meter to quantify humidity levels inside the cabinet.
4

*Component inspection**: If safe to do so, and after confirming the system is de-energized, inspect internal components for corrosion or water damage. Use a flashlight to inspect for water traces.
5

*Seal Replacement**: Replace any damaged seals or gaskets to prevent further moisture ingress. Ensure the replacement seals are compatible with the RESU 13 and provide a proper seal.
6

*licensed technician Drying**: If moisture is present, use a licensed technician-grade dehumidifier or drying agent to remove the moisture from the cabinet. Ensure all internal components are completely dry before reconnecting the system.
7

*Testing and Reconnection**: After drying, thoroughly test the system's functionality. Monitor cell voltages, SOC, and temperature using the LG monitoring app. Reconnect the system to the AC and DC sides and verify proper operation.

Possible Causes:

Compromised enclosure seal allowing humid air entry.
Temperature fluctuations causing condensation within the cabinet.
Leak from nearby plumbing or roof.
Failed desiccant pack (if present) within the enclosure.
Manufacturing defect in the enclosure leading to inadequate sealing.
Improper system, leaving gaps for moisture ingress.

Technical Overview:

The LG RESU 13 contains lithium-ion cells managed by a Battery Management System (BMS). The BMS monitors cell voltage, current, temperature, and State of Charge (SOC). Moisture ingress can disrupt the BMS readings via short circuits in the sensor circuits or corrosion of the battery cells. Proper ventilation and sealed enclosure design are crucial to prevent condensation. DC/DC conversion within the unit steps down the high voltage from the battery to a lower voltage suitable for the inverter. Ingress may cause insulation breakdown leading to safety concerns. Grid synchronization is affected during charging/discharging cycles.

Observed Symptoms:

Visible moisture or condensation observed inside the LG RESU 13 battery cabinet during routine inspection. May be accompanied by error messages on the system's monitoring app related to temperature or voltage anomalies.

Prevention:

Regularly inspect the battery cabinet for any signs of damage or moisture
Ensure proper ventilation around the unit and avoid placing it in areas prone to high humidity
Consider installing a dehumidifier in the surrounding area if necessary
Check and replace desiccant packs (if present) annually
Apply appropriate sealant where required during install to avoid ingress