Only some hybrid solar systems are designed to operate during a black out (grid outage). Most all-in-one box systems generally have too small a battery in order to power a premises during a black-out, however some of these types of systems have a limited power output that can be applied to small loads during a black-out (lights and small fridge for eg) for a small period of time. Modular systems however, allow the system designer to scale up and add just about as much solar and battery capacity as desired, so yes, we are able to custom design a solar hybrid system to fully operate all of your loads during a grid outage. See our Inverter chargers page for solar hybrid systems that can operate during a grid outage.