We had a truck park next to us at a meeting we went to. Home conversion using all domestic appliances. After he had been there an hour or so he revealed that the truck was all electric and he would need to run his generator. He rolled the roller shutter back door up and there was an old site generator sitting in its open frame. What a racket. No habitation batteries or solar just a generator and a lot of smoke. Eventually he turned it off as they were having trouble breathing inside.
He / She could of course be a DOUBLE GLAZING Salesperson