In places where the grid availability is zero or where there are high instances of a power cut, Off-grid systems are an apt solution for relief from power cuts and they can be installed with a standalone inverter with a separate or integrated charge controller.
If the off-grid system is designed with appropriate solar panels and batteries, it can supply power throughout the year without ever relying on grid power. If the system is under-designed then the battery is always in very low status. We use inverters from reputed brands like Studer, Flin Energy, and Victron Energy and use charge controllers from reputed manufacturers like Phocos, Morning Star, etc. for our off-grid installations.