The Inverter can be simply custom-made to battery priority by means of DIP switch SW5. When battery precedence is selected, the inverter will provide electric power in the battery even when You can find AC input. With AC/battery precedence selector, automatic transfer switch, and split phase inverter assist for 50Hz/60Hz https://www.mailiinverter.com/low-frequency-inverter/
Low frequency inverter charger
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