Function Description

After the installer installs the device and powers on the system for the first time, the installer needs to verify the on/off-grid switching to check whether the on/off-grid switching function is normal. This operation prevents system exceptions caused by incorrect cable connections and avoids repeated site visits for rectification.

Method 1: On-Grid Operation Verification

1. Check that the grid is available and the system is running in on-grid mode.
2. Enable Off-grid mode for the inverter. For details, see Setting Feature Parameters.

   For parallel-inverter scenarios, to ensure the accuracy of the verification results, enable Off-grid mode for all inverters to avoid switching failures.

3. Check that the residential backup load power does not exceed the off-grid operating power of the inverter.
4. Connect to the inverter, choose Set > Backup power settings > Manual on/off-grid switching on the home screen, and switch the mode based on the actual status.
   • If the system is in on-grid mode, tap Off-grid to switch the system to off-grid mode. When the system is manually switched back to on-grid mode, the system switches to on-grid mode.
   • If the system is in off-grid mode, tap On-grid to switch the system to on-grid mode.

5. After the switching, observe the status change on the home screen of the inverter to check whether the switching is successful.

• If switching to on-grid mode fails, the power grid may be abnormal or the grid connection conditions may not be met. Check and try again.
• If switching to off-grid mode fails, the load power may be too high or the backup load may be abnormal. Check and try again.

Method 2: Off-Grid Operation Verification

1. Enable Off-grid mode for the inverter. For details, see Setting Feature Parameters.
2. Turn on the main circuit breaker.
3. Check that the indicator on the inverter is steady orange when the inverter is in off-grid mode due to a grid failure.
4. After the grid recovers, check that the system runs properly in on-grid mode and the indicator on the inverter is steady green.