A small 25-50 watt solar panel and good charge controller will go a long way to keeping the batteries in decent condition if you keep the boat on a mooring.
If you want a fridge, get a fridge, but here are my suggestions;
Get a propane (or other fuel) fridge, electric ones will KILL your batteries fast.
Or just jam your needs-to-be refrigerated stuff in an icebox in the lowest part of the bilge. You will have ice for a week around here. (PNW winter)
You must not know a whole lot about the non-electric, non-engine powered fridges. They're not designed to be used on most boats, since they NEED TO BE LEVEL to operate safely. They can be used on multihulls, and are stock equipment on some catamarans... but they are not suitable for a 21' monohull.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.