At the heart of an off-grid power system is usually a DC-to-AC inverter, converting the power stored in a battery bank to 230VAC, allowing you to power just about anything, anywhere. Nowadays, it is very common to use an "inverter-charger", which will automatically transfer power from the DC battery bank to a 230V feed from either the mains network or from a backup generator.
We generally programme the inverter-charger to start / stop the generator automatically, meaning that the system is self-maintaining; as soon as the inverter-charger sees the 230V from the generator, it automatically switches from the DC battery bank to the backup generator, using any excess power capacity to boost charge the batteries.
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