thread veered a bit, and I had questions on sizing a watermaker
that I thought warranted a new thread.
My wife and I will be leaving next year for an open-ended cruise
. Trying to decide on a watermaker as part of a refit
. Our boat
has 200g freshwater capacity which lasts us about 10-14 days, so we go through about 15-20 gals/day of water
which we can easily stretch if needed. We have a 6kw generator
, and enough solar/battery to be off-grid (e.g. no engine
or genny) unless we need A/C or run a Watermaker.
Simplicity and off-the-shelf components of a system such as these systems from Cruise RO
is compelling for me. Note the 20gpd and 30gpd use same motor
, only difference is a second membrane/vessel ($800 uplift), which means there is no power penalty for the increased production.
Is bigger always better? Is there a recommended run-cycle for a watermaker?
I would have thought bigger is better - shorter run time. But maybe not - some systems (such as household A/C) do not work
well when over-sized. And as someone pointed out on the other thread, the flushing
cycle wastes same amount of water
regardless of cycle time. 20gph, 30gph, or 40gph?
General rule of when to start refilling tanks?
As mentioned, we have 200g tankage which lasts 10-14 days. All things being equal, is there a recommendation on when to run the watermaker? Keep the tanks
topped-up? Wait until they are down, say 1/4 full? Doesn't matter, just fill them opportunistically when you happen to have excess power (engine running with HO alternator
, for example)?
. I'm guessing the startup amperage (LRA) on a 9-amp/120VAC pump
is in the neighborhood of 25-amps. Are soft-starts possible/common?
Thanks in advance -