small electric pressure washer pump for watermaker - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 07-10-2011 Thread Starter
Junior Member
 
Join Date: Jun 2011
Location: Live in north tx, keep our boat in Seabrook tx
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
small electric pressure washer pump for watermaker

I was wondering if anyone has tried to incorporate parts from a small electric pressure washer into a reverse osmosis watermaker... The amperage draw factors out to being around 6 amps and I calculated with the pump's 2000psi, and 2 gal per minute delivery to harvest almost 40 gallons in an hour through a 2 membrane system, so basicly one of our 240 watt solar panels should run this system, and at 1 hour a day should keep our water tank full and then some... I dont expect the pump materials will resist salt corosion for very long, but the pump is supposedly stainless steel lined... at the very least, with the motor and pump being together it seems like it could be a good start-up system, and be swapped out at a later date for a heavier duty engine mounted CAT pump... Our boat has a very easily accessed engine compartment (all 4 sides)... I am a welding contractor and fabricating the brackets and getting it mounted to the engine are not the issue... the problem with my boat is that there is not much room inside the compartment when the compartment panels are in place, so It's possible I may not have enough room for mounting one to the engine...
tonejunkie99 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 07-11-2011
Senior Member
 
Omatako's Avatar
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,561
Thanks: 1
Thanked 33 Times in 30 Posts
Rep Power: 12
 
Given that the average membrane requires only about 850psi to produce fresh water, you'd have to regulate the pressure down (but then you already know that).

I'm busy building a watermaker myself at the moment so your pump is of considerable interest to me.

I have a 3 cyl CAT pump that I plan on using on the main engine but also multi-tasking it with an electric motor with a magnetic clutch to seperate the drives as required. The electric motor I have been advised to use is a half-horsepower AC motor that takes quite a lot of juice from the battery bank via the inverter. I would not have thought there was a 2000psi pump that delivers 2 gallons a minute that could run on a 240w solar array. But I'm very happy to be educated.

So I'd be most keen to know the identity of the pump/motor combination and given that it is able to run off your 240w solar array I assume the motor is 12v. If it is a 110v motor (if it comes from a domestic pressure washer then it probably is) then your solar array will only provide about 2 amps not counting losses due to inversion.

And what size membranes are you planning on using that deliver 20 gallons an hour each? I have two membranes that admittedly are quite small but they only deliver about 35 litres (less than US 10 gallons) an hour each at 850psi.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

__________________

"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."

Arthur C. Clarke
Omatako is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 07-11-2011
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,856
Thanks: 46
Thanked 65 Times in 65 Posts
Rep Power: 10
   
Dock
Quote:
Originally Posted by tonejunkie99 View Post
I dont expect the pump materials will resist salt corosion for very long, but the pump is supposedly stainless steel lined...
Have you thought about fitting a back-flush system??

Even if it's only a hose connection for use dock-side, you will need one to get rid of the salt...

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 07-11-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,512
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
I'm not sure if this will help but it is probably worth a look at least.
http://www.westward-ii.com/PDF's/How...watermaker.pdf

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 09-11-2011
RachelRoberts
Guest
 
Posts: n/a
Hi,
All you've said below is true, but multiple units turning water flow into electricity that run only when some one is going to use the water any way would more then offset the cost of the water itself plus feeding electricity back in to the grid. Further, the idea is to not try to get big gains, but for thousands of households to install such units obtaining a very small gain from each. Even installing such units in gutters would garner a little bit of electricity.
http://www.best-pressure-washer-revi...r-ratings.html

Last edited by RachelRoberts; 09-11-2011 at 02:05 PM.
 
Quote Quick Reply Share with Facebook
post #6 of 6 Old 05-08-2012 Thread Starter
Junior Member
 
Join Date: Jun 2011
Location: Live in north tx, keep our boat in Seabrook tx
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: small electric pressure washer pump for watermaker

I may have over estimated the production of the membranes, it seems they only produce around 10 gal each in real life... still plenty... I upgraded to a 280 watt solar array that is charging a bank of 4 AGM batteries, and I also have another bank of 4 that i am in the process of tieing into the system with a sunforce 600 watt wind turbine. I am currently using a xantrex mppt controller to regulate the charging, and using a xantrex true signwave converter to power a small refrigerator, and intermittent use of a tv, microwave and laptop computer... I do also have an additional 280 watt solar panel, but I really hope the addition of the wind generator will kill the need of a 2nd solar panel because these 280 watt giants are 33" x 77" in length. there is room behind the split backstay for one panel across the rear of the bimini, but there is only 33" of room between the back stay and end of the boom which leaves no clearance...
tonejunkie99 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Rule bilge pump low pressure..advice please flipdoc Electrical Systems 4 06-29-2011 08:57 PM
Electric fuel pump on PSC 31 AlLorman Pacific Seacraft 18 02-17-2011 03:11 PM
Second electric bilge pump mainemandean General Discussion (sailing related) 2 01-25-2011 11:00 AM
electric fuel pump Philip Littman Pacific Seacraft 4 01-20-2007 12:28 PM
Small Electric Start Outboard FRRizzo111 Gear & Maintenance 1 07-06-2005 07:13 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome