Hello, how is this build going? Did the most recent diagram you posted work as expected? I am interested in building one of these for car camping to power a CPAP machine for several days. I think my current inverter is 750W, 500 running, but I'm not even using that, so very low amps. If anyone who has done this can give me a rough estimate on weight, by my calculations it's looking like roughly 46 lbs. for the batteries alone, that would be great. Also, I will need a charger as I don't have solar panels, so suggestions there also. Help for somewhat of a n00b please. Thanks!