We're putting this together on the cheap! We've got various sizes and types of batteries and we're putting them to the test to see if you can get a $40 lead acid battery to run a fridge in case of a power outage, grid down, or similar event. Naturally we start upgrading the system from there with the best bang for your buck budget setup in this ultimate DIY guide to the numbers, the process, and everything else you need to know to build an off-grid or emergency power backup lead acid battery inverter system to run a fridge or similar appliance. P.S. I forgot to mention: I got that yellow inverter for a steal at a reseller. I would never pay retail or used price on one that over-spec.