Inverter chargers typically have a built in transfer switch that will sense when you are plugged into an AC source such as shore power or a generator.

When AC is recognized by the inverter charger, the unit will act as a pass through, power your devices from the AC source and also charge the batteries if desired.

When the inverter charger detects a loss of AC, the unit will switch over to invert or DC mode and power your devices off of the batteries that the power inverter has been charging.

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