True, but you can not run a business with a 5.5KVA genny, nor can you do that much with a 100Amp battery.
Try making an expresso with a genny, the fuel will cost more than the cuppa.

Running a PC and a printer should be OK on the genny, but the expense on fuel will be a problem.
I suppose one can adapt and add it to the cost of running the business, which ultimately lands up that the customer has to pay. However if the customer has no bucks, then business suffers?