Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 27-01-2019, 00:58   #1
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 743
Realistic sized desalinator (water-maker)

I am busy installing the water tanks right now. I had planned on three tanks down inside the keel plus four "wing-tanks" but have now discarded the wing tanks because I realize I need to increase the size of the house battery bank to 4 X 135 Ah (and I need the room). The three remaining tanks will have a capacity of around 105 US gallons (390 L).

I've looked for threads on desalinators for yachts but they are all technical. My questions are:
  • How many liters per day (or per hour) is a realistic size?
  • Has anyone had feed-back on the kits available for people who prefer to DIY
https://www.ebay.com.au/itm/Boat-des...frcectupt=true


Clive
__________________

coopec43 is online now   Reply With Quote
Old 27-01-2019, 01:57   #2
Zai
Registered User

Join Date: Mar 2011
Location: Athens
Boat: 2011 Bavaria 36 Cruiser
Posts: 198
Re: Realistic sized desalinator (water-maker)

I have a 30 liter per hour watermaker and while it is "enough" in my opinion it would be nice to have more capacity.
It would be nice to have a larger membrane with two supply pumps, of which one or both pump could be run depending on circumstances.
__________________

Zai is offline   Reply With Quote
Old 27-01-2019, 02:29   #3
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 8,599
Images: 69
Re: Realistic sized desalinator (water-maker)

It really depends on how much water you need.... with two of us aboard we use about 40 litres per day, so our 40 litre/hour watermaker is fine for us. Run it for 2 hours every other day.

Also, the set up of your boat... how much solar, or do you need to run a diesel to charge batteries. If so then a large capacity engine driven unit might be a better match. If you run a genset, a 240 or 100 volt unit. If solar, then a 12 volt unit.
__________________
"You CANNOT be serious!"


John McEnroe
44'cruisingcat is offline   Reply With Quote
Old 27-01-2019, 02:29   #4
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 743
Re: Realistic sized desalinator (water-maker)

Quote:
Originally Posted by Zai View Post
I have a 30 liter per hour watermaker and while it is "enough" in my opinion it would be nice to have more capacity.
It would be nice to have a larger membrane with two supply pumps, of which one or both pump could be run depending on circumstances.

Would that unit run off the motor or can they realistically be battery powered? (this is all new to me)


Clive
coopec43 is online now   Reply With Quote
Old 27-01-2019, 03:37   #5
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 743
Re: Realistic sized desalinator (water-maker)

DIY – The World's Cheapest Watermaker.

by Ted Nobbs on 9 May 2007

"For long range cruising, or even a three week holiday, we think a watermaker is an essential item on a boat. The commercial variety range in price from approximately US$3,500 to US$11,000 for a water production rate of 40 -140 litres an hour.

Bob tells me that this design has been passed around the long range cruising community for the past few years. It produces 100 litres per hour, for, with diligent buying, a cost of approximately US$2,000."

www.sail-world.com/33568


Clive
Attached Thumbnails
Click image for larger version

Name:	Temp Watermaker.JPG
Views:	1017
Size:	83.8 KB
ID:	184565  
coopec43 is online now   Reply With Quote
Old 27-01-2019, 07:34   #6
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 6,758
Re: Realistic sized desalinator (water-maker)

Realistic is for you to decide.

How much water do you use per day?

How will you power it?
Sailmonkey is offline   Reply With Quote
Old 27-01-2019, 08:45   #7
Registered User
 
Jeanneau 45.2's Avatar

Join Date: Mar 2015
Location: Full time cruiser
Boat: 2000 Jeanneau, 45.2
Posts: 204
Re: Realistic sized desalinator (water-maker)

Higher capacity requires 120V power. I have one and produce 24 gals per hr. We use a lot of water, so I run every other day for 2 hours to keep up with needs. Water is like money ... more you have the more you find ways to use it.
Jeanneau 45.2 is offline   Reply With Quote
Old 27-01-2019, 09:25   #8
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 20,883
Re: Realistic sized desalinator (water-maker)

Mine were engine powered, assembled from kit or a used 120v watermaker. Something like 24 gal per hour max. manual controls.
Filter>Cat pump> Pressure relief valve> Needle valve to adjust pressure>Membrane(s)>water tank.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 27-01-2019, 10:48   #9
Registered User

Join Date: Dec 2009
Location: Cruising, now in USVIs
Boat: Taswell 43
Posts: 406
Re: Realistic sized desalinator (water-maker)

After you determine how much water you need/day, then you need to decide how often (1/day, 1/2days. 1/3days, 1/4days), and how long each time you run it. We have friends who run theirs every day for 8 hours! With the 2 of us onboard, we run our 30gph machine for approx.2 hours every 3-4 days.....it really is... all up to you. But IF you have a genset, and you expect to run it every (??) days to recharge the batts, etc....then you could also make water at that same interval. Or, like my friend, you could run it off the house bank every day for (??) hrs. It really does depend on how you chose to manage it!
sailcrazy is offline   Reply With Quote
Old 27-01-2019, 10:48   #10
Registered User

Join Date: Nov 2017
Location: Auckland NewZealand
Boat: HANSE 455 45 feet
Posts: 6
Re: Realistic sized desalinator (water-maker)

I have a CJD WATERMAKER NZ made 12 volt 16 amp 60 liter per hr very quiet I have the auto flush model water is now no problem
PEACEMAKER 455 is offline   Reply With Quote
Old 27-01-2019, 10:51   #11
Registered User

Join Date: Nov 2017
Boat: Island Packet, Packet Cat 35
Posts: 157
Re: Realistic sized desalinator (water-maker)

As an alternative you might check this guy out. His units start at $1600. Produces 21 GPH. Essentially the same as the DIY drawing above except he's sourced all the pieces for you.

https://seawaterpro.com

How much water do you need? That's a personal question. Live on your boat, don't use shore water, marina bathroom or shower. Live as you normally do and keep track of how often you fill your water tank(s). I'm in the PNW and going into the tropics will need more water for hydration and rinsing dive equipment so am planning for a larger system.
Cpt Mark is online now   Reply With Quote
Old 27-01-2019, 10:56   #12
Registered User

Join Date: Aug 2009
Location: Switzerland
Boat: Outbound 46 -Callisto
Posts: 205
Re: Realistic sized desalinator (water-maker)

We have a 12.5 gal/hour Spectra, and it is plenty big enough for the two of us. Very energy efficient, about 1.5 amp/hr per gallon. We generally run it every 4th or 5th day for 3 hours. We have enough solar and wind to power the unit most of the time.

In general I think simpler is better, and the engine-driven units seem complicated to me. The Clark pump on our Spectra isn't exactly simple, but the energy savings make it more than worth it.

If you have a generator on board anyway, then I would certainly go with an AC powered unit. You can pick your capacity to match your run time to the time you need for battery charging.
DMCantor is offline   Reply With Quote
Old 27-01-2019, 11:39   #13
Registered User
 
Ivansgarage's Avatar

Join Date: Dec 2015
Posts: 54
Re: Realistic sized desalinator (water-maker)

Try this guy has a very very good reputation....
He is in Tucson Arizona

http://sunpurewatermakers.com/
Ivansgarage is offline   Reply With Quote
Old 27-01-2019, 13:56   #14
Registered User
 
GeneM's Avatar

Join Date: Jul 2014
Location: Harbortown - Merritt Island, FL
Boat: 1998 Sealine Statesman 42ft - Twin Cummins 6BTA
Posts: 109
Re: Realistic sized desalinator (water-maker)

Quote:
Originally Posted by coopec43 View Post
DIY The World's Cheapest Watermaker.

by Ted Nobbs on 9 May 2007

"For long range cruising, or even a three week holiday, we think a watermaker is an essential item on a boat. The commercial variety range in price from approximately US$3,500 to US$11,000 for a water production rate of 40 -140 litres an hour.

Bob tells me that this design has been passed around the long range cruising community for the past few years. It produces 100 litres per hour, for, with diligent buying, a cost of approximately US$2,000."

www.sail-world.com/33568


Clive
Are you at all concerned about the PH of drinking water? I hear it's quite acidic unless treated.
GeneM is offline   Reply With Quote
Old 27-01-2019, 14:13   #15
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 14,131
Re: Realistic sized desalinator (water-maker)

Quote:
Originally Posted by GeneM View Post
Are you at all concerned about the PH of drinking water? I hear it's quite acidic unless treated.
Was typing a response, but decided you need to do the basic lookup
__________________

__________________
jobless, houseless, clueless, living on a boat and cruising around somewhere
sailorboy1 is offline   Reply With Quote
Reply

Tags
size, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transmission cooler install... adapting raw water hose size & odd sized hose barb... basssears Engines and Propulsion Systems 0 17-03-2017 14:56
Realistic boats for blue water cruising Smithpurd Monohull Sailboats 35 08-08-2015 11:08
Passive Emergency Desalinator GordMay Health, Safety & Related Gear 18 14-05-2008 15:24



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:48.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.