Yes, this can be achieved if your system components have been sized correctly for this purpose. However, most all-in-one box systems generally have too small a battery and inverter to completely power a premises, so some grid power is required to make up the shortfall. Modular systems however, allow the system designer to scale up and add just about as much solar, inverter and battery capacity as desired, so yes, we are able to custom design a solar hybrid system to fully operate all of your loads, even during a grid outage. See our Inverter chargers page for modular solar hybrid systems that can operate all of your loads, even during a grid outage.