Three-Phase Backup Box
2. If the mains recovers but the inverter still works in off-grid state (LED1 and LED2 are steady
orange), contact the customer service personnel or dealer for repair.
3. If the off-grid mode is enabled when no Backup Box is connected, an alarm indicating that
the Backup Box is abnormal is reported when the AC power supply is disconnected. In this
case, the fault cannot be rectified. The fault is rectified only after the inverter and battery are
powered off.
4. If the Backup Box is used for the first time and is not used later, you must disable the off-
grid mode when the inverter is running properly. Otherwise, you need to power on the
inverter again and modify the settings.
5. If the single-phase Backup Box generates abnormal noises during repeated switching, check
whether the inverter AC terminal is reversely connected to the power grid AC terminal.
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