Troubleshooting inverter shutdowns during peak loads — what to check?

Proper Inverter Sizing

When troubleshooting inverter shutdowns during peak loads, start by verifying that the inverter is properly sized for the system’s electrical load. A general rule of thumb is to size the inverter to 10-15% of the system’s total power output. For example, a 5 kW solar array should be paired with a 500-750 W inverter. This ensures the inverter can handle the system’s peak power output without shutting down.

Electrical Load Profiling

To identify the root cause of the inverter shutdown, analyze the electrical load profile during peak usage. This involves monitoring the system’s electrical load using a power meter or energy monitor. Look for any unusual spikes or surges in the load that may be causing the inverter to shut down. For instance, if the load exceeds 90% of the inverter’s capacity, it may trigger a shutdown. Consider upgrading the inverter or modifying the electrical load profile to prevent shutdowns.

Inverter Settings and Configuration

Check the inverter’s settings and configuration to ensure it is optimized for the system’s electrical load. Review the inverter’s MPPT voltage range and ensure it is set correctly to match the system’s solar array. Also, verify that the inverter’s ground fault protection (GFP) is properly configured and not triggering unnecessary shutdowns. Consult the inverter’s user manual or manufacturer’s documentation for guidance on optimizing the inverter’s settings and configuration.