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LG Energy Solution•RESU 16H Prime

Analysis by Marcus & Team

LG RESU 16H Prime Error 87 Troubleshooting

Troubleshooting LG RESU 16H Prime Error 87. Expert diagnosis and solutions for residential battery storage systems. Safety and NEC compliance emphasized.

Frequently Asked Questions

•What are the voltage limits of the RESU 16H Prime?

Nominal voltage is around 400V DC, but consult the manufacturer's datasheet for exact voltage limits.

•How do I update the firmware on the LG RESU 16H Prime?

Firmware updates are typically performed remotely by a certified installer or LG Energy Solution technician via a secure connection.

•What is the warranty period for the LG RESU 16H Prime?

Consult the warranty documentation provided with the system or contact LG Energy Solution directly for warranty details. Typical warranty periods are 10 years, but conditions apply.

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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:

The LG RESU 16H Prime operates at high DC voltages (around 400V DC). Improper handling can result in severe electric shock, burns, or arc flash. Always de-energize the system before performing any maintenance or troubleshooting. Only qualified electricians familiar with NEC 690 and battery storage systems should perform these tasks. Do not attempt to disassemble the battery module.

Technical Recommendation:

Check the inverter's error logs. Sometimes Error 87 is a secondary fault triggered by the inverter losing communication with the BMS. Reviewing the inverter logs can provide valuable clues about the root cause of the problem.

Step-by-Step Fix:

1

De-energize the entire system by following the NEC-compliant rapid shutdown procedure and engaging the DC disconnect switch. Verify voltage is zero using a calibrated multimeter before proceeding.
2

Inspect all CAN bus wiring connections between the battery, BMS, and inverter for damage, corrosion, or looseness. Use a wire crimper to re-terminate any questionable connections.
3

Use a CAN bus analyzer tool to verify the communication signal integrity. Check for signal attenuation or noise.
4

Check the battery's DC voltage with a multimeter. Voltage should be within the manufacturer's specified range (typically 350-450V DC).
5

Consult the LG Energy Solution service manual for specific Error 87 troubleshooting steps and diagnostic commands.
6

Contact LG Energy Solution technical support for assistance and potential BMS firmware updates or replacements.
7

After completing all checks and repairs, re-energize the system and monitor for recurrence of the error.

Common Causes:

Damaged CAN bus wiring or connectors
BMS software glitch or firmware corruption
Faulty BMS module
Inverter communication error or incompatibility
Loose wiring connections
Electromagnetic interference (EMI) disrupting communication

Technical Background:

The LG RESU 16H Prime is a 400V nominal lithium-ion battery system. Error 87 signifies a disruption in the CAN bus communication protocol, which is essential for data exchange between the battery cells, BMS, and inverter. This communication loop provides vital information about cell voltages, temperature, SOC, SOH, and fault conditions. Failure in this communication affects the inverter's ability to manage charging/discharging, potentially leading to overcharge/discharge or thermal runaway.

What to Look For:

Error 87 on the LG RESU 16H Prime indicates a communication fault between the battery module and the Battery Management System (BMS). The system may shut down or operate in a limited capacity. The monitoring app will display the error, and backup power functionality may be unavailable.

Preventative Care:

Schedule annual inspections of wiring connections and battery terminals.
Keep the battery enclosure clean and free of debris to ensure adequate ventilation.
Monitor the battery's performance data (voltage, current, temperature, SOC, SOH) regularly using the monitoring app.
Perform periodic capacity tests to assess the battery's health and identify potential degradation.
Ensure the BMS firmware is up-to-date to address known bugs and improve performance.