What does your fridge consumes in terms of amperage? A typical firdge is about 4-5amps kicking in every 1/2 hour assuming it is properly insulated and not opened too often. Let's say it is not and it's running full 5amps for an hour. That means it needs a continuous 60W worth of juice. The solar panels
are at best about 50% effcient during the day on the average. So to get 60W you need at least 120W panel. I would say 2 100W panels
should be sufficient. Now if you have an electric winch
and all kinds of electronic goodies - TVs, computers
, chartplotters, etc, etc. we're talking at least 400W or more. But in the long run it is much better to have extra panels
than to run your engine
or the genset. Since I don't use my fridge now I get by with 80W total from 3 older panels. I did buy 4 110W panels and will be installing them for next season. Should be plenty enough for all my needs incl. the 11.5cft fridge.