I sail out of New Bedford harbor. I'm behind the Hurricane Barrier.
On a 50' boat with a 7 kW Genset, then you should be okay. Remember that you'll want to backflush the membrane with RO water each time you shut the unit down, unless you're not going to be using it for more than a few days, in which case you'll probably want to pickle the membrane.
I'd also recommend plumbing in a separate tank that you fill only with RO water that you can use to back flush the RO membrane. The reason for this is simple—chlorine will destroy the RO membrane, and if you accidentally flush the system with non-RO water, you stand a really good chance of destroying it, since most municipal water systems use chlorine. This also allows you to test the output of the watermaker before transferring it to your main fresh water tanks.
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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.