Easiest way is to figure out your average daily use (AH's) then you will know how big of a battery bank you will need. Say for example on average you use 100 ah per 24 hour period. You would want a minimum 220 ah battery bank of deep cycle battery (60 percent draw down).
Then to charge that bank (220 ah) back up on a sunny day you would want approx 1.5 watts of solar per 1 ah of battery. So you would want 300 watts of solar (approx 21 amps for solar). This will give you a rough idea what you need.
I get by quite nicely with 220 ah of battery and 200 watts of solar, but I am not a power hog.
