Just go ahead and forget about kwh. If you are concerned with the capacity of the generator, focus on the loads it serves. And, and this is a BIG 'AND', capacity will be will be limited more by how the loads react at start up, than the 'paper value', or normal operation of the load. (LRA, excitation current of transformers, etc, etc.) Suddenly drop too heavy of a load on the generator too fast, or all at once, and you could have the gennie stall, or drop the load as an over-load. Talk to your generator Rep. to see what that maximum current, and duration is. In fact, you may find some, if willing or suspect that you are interested in the possible sale of a generator, might just do this whole calculation for you. Or be able to suggest eqipment that can better mange, or increase the load capacity.
