No, what I am saying is that these units require a fairly hefty AC system, and most small sailboats do not have the electrical capacity to power them for any period of time reasonably. The Pro 500 draws 15.2 AMPS @ 110 VAC... if you need an inverter for that, you're looking at about 150 amps. IMHO, you'd need at least a 2 KW generator to properly feed the watermaker.
Most people who want a watermaker aboard their boat want one to help make the boat more self-sufficient and extend the time between marina visits. A watermaker like the Pro 500 doesn't really do this, as it increases your dependence on fuel for the generator. A smaller RO unit that is more closely matched to your actual needs would probably make more sense. Not only would you run it more often, which helps prevent the membrane from getting contaminated, but it would use far less electrical power, and might be usable using passive electrical generation—like wind and solar.
Are you saying that it draws more current than the most common ones that are on the market? The plans I have looked at to build your own have the same size pump and motor. I'll be using it when I'm running the generator to charge the batteries and I don't think any units that are powered by dc will give you 15-20 GPH.
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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.