First, you really should install a battery monitor to get a more realistic idea of what you're really using on a daily basis. This will also give you a much more accurate basis for sizing your charging system and battery bank.
Reducing your usage is often far more cost-effective than increasing your battery bank size, since a larger battery bank will cost you more in fuel used, weight, etc.
I would point out that batteries are sized in AMP-HOURS, not amps, since amps are an instantaneous rating and really say nothing about the battery bank's actual capacity. The amp-hour rating that is generally used is the 20-hour rate.
Mitempo's advice about using the genset to power the washer is a good one, since it will put a lot less wear and tear on your batteries. If you do opt for a genset, it might make sense to get electrical refrigeration, rather than engine-driven refrigeration.
One caveat about the watermaker is that you should still carry enough water for you and your crew's needs, since watermakers can break. They also should not generally be used in populated harbors, since most are too polluted and will damage the RO membrane if you use the watermaker there. IIRC, the ORC racing rules say that you should carry one gallon per person per 100 miles of distance remaining on each passage at a minimum.
I'd recommend you read this article on Solar Power on Boats
I wrote a while back.
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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.