I am having some trouble understanding if I am doing my calculations correctly when trying to calculate the battery size / solar panel wattage for our RV.
I started off small by just calculating for my laptop.
My laptop draws about 5 amps on 120V (mains) which is 600W.
So next I did the calculations for the battery and solar panels. I am assuming that because I am using a 12V battery I will need to change the amps by a factor of 10 to get the same wattage.
Battery (12V) - 50 amps * 12V = 600W (So if I use my laptop for 8 hours then I am looking at 50amps*8hours = 400 amp hours)
Solar Panel (18V) - 50 amps * 18V = 900W
This seems a very big setup for just running one laptop, can someone tell me if this is actually correct or where I am going wrong. Does the inverter affect this or is my math just way off?