After the grid power supply is off, what happens if the FHP batter power is exhausted?
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If the FHP battery power is running out, the grid power supply is off, and the solar system isn’t generating enough power to charge the aPower X batteries, you need to turn off home loads. When there is enough power supply from the solar system, the FHP will attempt a black start. If successful, it will begin to charge the aPower X batteries. You need to disconnect the loads from the FHP and reconnect them when battery SOC goes above 20%.