Solar Sanity check (SSC?)

prepilot_3ck wrote:
Fellow drivers of the Fonzie-Class RV,


This is a google sheet, but you shouldn't need a google account to use it. The fields highlighted in GREEN can be changed to effect the results. Feel free to change those fields and see how it changes stuff.

What I'm looking for:
I need a quick sanity check on the math there, and the results. There are enough "Black boxes" inline there that I'm not sure what effect they have on the math (charge controllers, inverters, etc).

What I'm hoping to determine:
I hope to determine, if in full, 8+ hours, of sun (I camp 99% of the time in the desert southwest of the US) how many panels do I need to run my residential fridge (1-3amps on the AC side) and still have enough juice to charge my batteries up from say...50% so when the sun goes down, I have full batteries to start with.

My conditions:
My RV is new to me, and came with brand new 6V batteries, arranged in a standard series/parallel setup to deliver 440A/Hrs. When these die, I'll swap them with something better, probably lithium but that's a few years out, so for now I'm dealing with what I have.

During the day, I need my panels to charge my batteries and run my fridge. At night, I'll turn off my fridge (by turning off my inverter) and just use the batteries for lights, water pump, phone/laptop charging and other somewhat minimal loads. I don't expect a ton of drain overnight, but I figure I'm probably under estimating there a bit. So, I expect to have mostly dead batteries by morning. I'll also be doing the initial cool down of the fridge on the generator while I'm driving. So when on the battery/solar is should be just maintaining temp, not cooling it down from ambient air temp.

So... what do you all think? Did't the 80's hair band Slaughter write a song about this? "Drain all night, charge all day!" I think those were the words anyway. :)

Thanks!
Brian