That really depends on the energy requirements of your boat. I have a friend that gets along just fine on 220 watts of panels
, but he only runs refrigeration
(well insulated), a few lights and fans. I on the other hand heve electric
heads, a windlass
winches etc., and found that my 300 watts of panels
was not enough in Jan and Feb. I had to run the genset every couple of days for a few hours. My biggest hog was the incandescent anchor
light. This year it will be LED. It's even worse when I'm sailing as the autopilot
then becomes my biggest drain.