In the case of an Off Grid Solar System, Power Generated from the rooftop system is stored in a battery bank and then fed to load as and when required. Both types of appliances AC and DC can be connected to this system. The inverters are smart and can optionally use the grid power also to keep the load running when power from solar and battery bank is not enough to cater to the total load. Smart logic of the inverter will ensure that uninterrupted power supply is available with bare minimum use of grid power.
A Grid-tied Solar Rooftop system is energized by photovoltaic panels which are connected to the utility grid through a bi-directional meter which keeps track of all the power the solar system produces. Any solar energy that is not used immediately goes back into the grid through this meter. The Utility gives credit for the excess electricity received by it and deducts the credits earned from your monthly electricity bill.