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Go Back   SailNet Community > On Board > Gear & Maintenance > watermakers
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Topic Review (Newest First)
03-18-2010 05:52 PM
tomaz_423
Quote:
Originally Posted by JamesG123 View Post
What about condesate watermakers? Not old steam water makers, but machines that chill air below the dew point to pull its moisture. Just a representative of the COTS products.

It does not have nearly the per minute output, but it can steadily generate water and can be encorporated into a AC or refidgeration system.
This is not for a boat, You can not have a device drawing 500W all day to produce 7 gal of water daily.
You will burn almost as much fuel in your generator as you will produce water..
03-18-2010 02:51 PM
sailingdog
Quote:
Originally Posted by bloodhunter View Post
We have a solar array (2 120-watt panels ) and we plan to add a wind generator. The array by itself has met all our electrical needs keeping our 700 AH battery bank fully charged. But admittedly we don't have any really heavy draws, just the refrigerator, lights, fans and electronics. With the wind generator I was assuming that we could handle a watermaker (Spectra 150 running an hour or two a day) as well. But, there seems to be a consensus on this thread that you need a genset tor un a watermaker so what am I missing?
No, you don't need a genset to run an RO watermaker, provided it is a relatively small unit. When setting up a watermaker, there will be a few things you will want to do that the watermaker manufacturer may or may not tell you.

First, you want the watermaker output to have a dedicated water tank. This is for a couple reasons. First, if the RO membrane fails, you aren't mixing salt water with the potable water in the other tanks. Second, it gives you a source of chlorine free water to backflush the RO membrane. Chlorine will destroy an RO membrane.

Second, you want to have some way to transfer water from this tank to the regular water tanks on your boat, but have a check valve so that water only goes from this tank—see above for why.

Third, you want to size the watermaker so that you don't necessarily have to run it every day...but more like every third or fourth day. This reduces the amount of water used to backflush the RO membrane percentage wise, but keeps the watermaker operating regularly enough that pickling the membrane isn't necessary.

Fourth, remember, you don't want to run an RO watermaker in the harbor. Bacteria and petroleum wastes are fairly common in the harbor and both will damage the RO membrane. An RO watermaker should only be run in clean seawater—harbors and populated areas rarely qualify for this.
03-18-2010 01:14 PM
bloodhunter We have a solar array (2 120-watt panels ) and we plan to add a wind generator. The array by itself has met all our electrical needs keeping our 700 AH battery bank fully charged. But admittedly we don't have any really heavy draws, just the refrigerator, lights, fans and electronics. With the wind generator I was assuming that we could handle a watermaker (Spectra 150 running an hour or two a day) as well. But, there seems to be a consensus on this thread that you need a genset tor un a watermaker so what am I missing?
03-18-2010 11:17 AM
SailD If you're collecting condensate from a clean surface the water is perfectly distilled, which does make it taste a bit funny though as even RO water has quite a bit of minerals and other junk in it.

I'd quite like to build a small flash evaporator to use waste heat from the engine/generator or some type of solar still. With a decent vacuum you could make water at about 65º and with a bit of refinement get quite a bit out of it.
03-18-2010 10:50 AM
Cruisingdad
Quote:
Originally Posted by JamesG123 View Post
Anyone?
We have a dehumidifier on our boat. Sure can pull out a lot of water when it is warm. I would have to be pretty thirsty to drink it and it sure wouldn't be much - and our dehumid is a large one (took the one out of the house we sold and use it here... waste not want not).

You are better off with a watermaker.

Brian
03-18-2010 10:37 AM
JamesG123 Anyone?
03-05-2010 05:41 AM
JamesG123 What about condesate watermakers? Not old steam water makers, but machines that chill air below the dew point to pull its moisture. Just a representative of the COTS products.

It does not have nearly the per minute output, but it can steadily generate water and can be encorporated into a AC or refidgeration system.
02-26-2010 08:14 PM
sailingdog
Quote:
Originally Posted by Tagalong View Post
I am just wondering how often you have to replace the filters on a watermaker.
That depends on how much you use it and how clean the water is where you use it.
02-26-2010 07:21 PM
Tagalong I am just wondering how often you have to replace the filters on a watermaker.
01-27-2010 09:35 AM
Cruisingdad Well, I personally have seen that there is a price difference - but it is not massive unless comparing against a Spectra or other 12v, high end model. I have always felt the big positives are that you can make a LOT of water quickly, and if it breaks, YOU know how to fix it. Go look at a Spectra to get a feel for what I am saying.

The negatives are that it is labor intensive, it is much larger than the typical commercially available units, and it may make too much water for you. The rule of thumb I have always considered is that you want to run your watermaker everyday or every other day to keep them membrand nice. WHen you start pushing off to a week+ between runs, you may have a problem with junk building up on the membrane and a premature death.

Note: Dad has a watermaker, not me. His is the SPectra. Nice unit, totally automated, and if that appeals to you and money is not an object, it is a good choice and good product. It is also the most efficient. I am either going to purchase a unit that is of the homemade variety (go here: Aquamarine, Inc - Home as I have seen on eof their products and that is all they have done) or I am going to make my own. I can use the large water cap and I personally want something I can repair and diagnose on my own. This does not appeal to everyone though.

Brian

PS You need a generator (unless you are really creative and can run it off your main and have the power to do so). I am not sure a 'Honda' would push it. If you do not have one, take it off your list.
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