each gizmo you want/need to provide power for will have a "rating plate" on it with the watt and volt information. There are also a load of online resources to use as well.i have a 1500 sq. ft. home and I want to power approximately 50% of it in a power outage. I am looking into a gas powered generator and want to know if a 6000W one will work? Load? AMPs? etc......I am not able to calculate this and just need a possible idea.