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LG Energy Solution•RESU 10H

Analysis by Marcus & Team

LG RESU 10H CAN Bus Error Troubleshooting

Troubleshoot an LG RESU 10H CAN bus error in a residential solar battery system. Diagnose communication failures, ensure system safety and reliability.

Frequently Asked Questions

•What are the common causes of CAN bus errors in residential battery storage systems?

Common causes include damaged cables, faulty transceivers, firmware incompatibilities, and electromagnetic interference.

•How can I prevent CAN bus errors in my LG RESU 10H system?

Regular inspections, firmware updates, proper ventilation, and periodic system checks are essential.

•What safety precautions should I take when troubleshooting a CAN bus error?

Always disconnect DC power before working on the system. Ensure proper arc flash protection and consult a qualified electrician.

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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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How It Works:

The LG RESU 10H uses a CAN (Controller Area Network) bus for communication between the battery management system (BMS), the inverter, and potentially other system components. The CAN bus allows for real-time data exchange, including voltage, current, SOC, SOH, temperature, and fault codes. A failure in the CAN bus can disrupt this communication, leading to system malfunctions. The system operates with DC voltages typically exceeding 400V DC. Grid synchronization is managed by the inverter, ensuring proper AC output (120/240V, 60Hz) when discharging to the home or grid.

Safety Warning:

Working with battery systems involves high DC voltages, which can be lethal. Always disconnect the DC power before performing any maintenance or troubleshooting. Ensure proper arc flash protection is used, and that the DC disconnect switch is easily accessible for emergency shutdowns, per NEC 690.13. Only qualified electricians should perform work on battery systems.

Why This Happens:

Damaged or improperly connected CAN bus cables.
Faulty CAN bus transceiver in the battery BMS or inverter.
Software or firmware incompatibility between the battery and the inverter.
Corrupted CAN bus data due to electromagnetic interference (EMI).
Power supply issues to the CAN bus transceiver within the battery or inverter.
CAN bus termination resistor failure (typically 120 ohms).

Observed Symptoms:

The LG RESU 10H battery system is displaying a CAN bus error. This may manifest as a communication failure between the battery and the inverter, resulting in system shutdown, inability to charge or discharge, or error messages on the monitoring app.

Pro Tip:

Use a CAN bus analyzer tool to capture and analyze the CAN bus traffic. This can help identify specific communication errors and pinpoint the source of the problem. Check for proper CAN termination resistance (typically 120 ohms) at each end of the bus using a multimeter.

Step-by-Step Fix:

1

*Safety First**: Disconnect the AC power to the inverter and then disconnect the DC disconnect switch between the solar array and the inverter, and the battery and the inverter, following NEC 690.
2

Verify no voltage is present on the DC bus using a calibrated multimeter.
3

*Visual inspection**: Inspect the CAN bus cables for any signs of damage, loose connections, or corrosion. Ensure proper termination resistors are present (typically 120 ohms) at the ends of the CAN bus. Consult the LG RESU 10H system manual for correct wiring diagrams.
4

*CAN Bus Continuity Test**: Using a multimeter, test the continuity of the CAN bus wires. Verify that the CAN High and CAN Low wires are not shorted to each other or to ground.
5

*Voltage Checks**: Verify the CAN transceiver power supply voltage. Consult the inverter and battery documentation for the correct voltage levels (typically 5V or 3.3V).
6

*Firmware Update**: Check for and install the latest firmware updates for both the battery and the inverter. Ensure compatibility between the two devices by referring to the manufacturer's compatibility list.
7

*BMS Reset**: Attempt a BMS reset following the manufacturer's instructions. This may require specific tools or software.
8

*licensed technician Consultation**: If the error persists after performing the above steps, contact a qualified electrician or LG Energy Solution service technician for further diagnosis and repair.

Maintenance Tips:

Regularly inspect the CAN bus cables for damage
Keep the battery and inverter firmware up to date
Ensure proper ventilation around the battery to prevent overheating
Perform periodic system checks to monitor battery health and identify potential issues early on
Monitor cell voltage and temperature via the monitoring app