Off grid inverter
If you are not connected to the grid, but you still want to use electricity then you go ‘off grid’. If you want to make a small 12-volt system, then you should take a look at Victron inverters. However, do you want 220 volts in your home, and have the space to put up enough solar panels? Then you need an off grid inverter that produces a pure sine wave. This will prevent the devices connected to it from giving up the ghost.
What does an off grid inverter do?
Such an off grid inverter converts the power from the solar panels for storage in the add-on battery. When power is demanded, this inverter controls that power from the solar panels is used first. This is supplemented by the stored power in the home battery.

In this category, besides off grid inverters that you can connect solar panels to, you will also find the SMA Sunny Island battery inverter. This inverter series produces a pure sine wave and can therefore be used to disconnect an existing solar system from the grid.