Much like on-grid batteries, off-grid solar batteries are charged with the excess electricity produced by your solar power system. However, off-grid systems supply power to properties that are either not connected to or have chosen to disconnect from the public electricity grid.
Once the solar batteries are full, the inverter will stop the solar system from supplying the batteries. The battery will send power to household appliances when the solar system isn’t producing enough electricity, for example during the night. When the battery is depleted, you can turn on the fuel generator and when this is running it supplies power to the house, allowing the battery to once again recharge.