Fans such as Hella, Caframo & cheap truckers fans can be run on 12V DC. They draw multiples less current than a home fan run through an inverter.Thanks for your help I need to power a CPAP breathing machine for sleep apnea as well I would like to power a small 1000 watt microwave and a fan that is about It I am located in the Great Lakes basin in Ontario Canada I have to large deep cycle marine batteries. I haven't purchased a charger and or inverter yet. Be interested in your thoughts.
Let's figure a 160A real world load for a 900W microwave..Here's a real-life example from a friend of mine:
He had a 3-battery setup, 1 starting and 2 house.
His wife tried to microwave 2 baked potatoes for 10 minutes and totally killed a healthy house bank.