CarGenerator

CarGenerator sells a compact device, about the size of a backpack, that turns a gas or diesel car into a backup power generator. It provides up to 1000 watts of pure sine wave power for furnaces, fridges, and electronics.

It can run a gas or oil furnace, a fridge, lights, computers, and internet routers for two to three days or more. High-draw appliances like air conditioning or hot tubs need a traditional gas generator instead.

The company ships free to the US and Canada and offers a 60-day satisfaction guarantee with a full refund. Order through the website or call the toll-free number with questions.