solar to hot water heater? - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 19 Old 02-08-2010 Thread Starter
Senior Member
 
SanDiegoChip's Avatar
 
Join Date: Jun 2007
Location: Puerto Vallarta Mexico
Posts: 402
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
solar to hot water heater?

Hi,
We are ready to purchase a Blue Sky SB3024DiL/DUO control for our wind generator and solar panels. We want to direct some elect to our hot water heater. This unite will do that. It got me wondering about our hot water heater though. I see they run on 110v and engine heat exchanger. Will this idea work or do we need a special hot water heater. I have not seen any that say they take a third source.
Thanks,
Chip
SanDiegoChip is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 19 Old 02-08-2010
Senior Member
 
kd3pc's Avatar
 
Join Date: Oct 2006
Location: Callao, VA
Posts: 1,389
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 9
 
it will be tough to get enough "solar" to run your hot water heater or any resistance type heat or appliance. The amount of electricity generated by even a couple of large panels is not enough to warm the water heater, if you could get it all there at the right time.

best of luck, btw the blue sky stuff is pretty good, it looks like this one includes the MPPT control and that is the more important piece.

dave
kd3pc is offline  
Quote Quick Reply Share with Facebook
post #3 of 19 Old 02-08-2010
BoatSmith
 
Boatsmith's Avatar
 
Join Date: May 2009
Location: Jupiter FL
Posts: 140
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
There should be a plate on the water heater that indicates how much power it uses, either in amps or watts. You can provide electricity to it through an inverter. Water heaters consume a lot of power. You might be happier with directly heating water from the sun as this is extremely efficient. David
Boatsmith is offline  
Quote Quick Reply Share with Facebook
post #4 of 19 Old 02-08-2010
Senior Member
 
bellefonte's Avatar
 
Join Date: Jan 2010
Posts: 127
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Why do we need to heat our hot water? ~ George Carlin

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


But it's not who you are underneath, it's what you do that defines you. ... Rachel Dawes
bellefonte is offline  
Quote Quick Reply Share with Facebook
post #5 of 19 Old 02-08-2010
Member
 
raisin56's Avatar
 
Join Date: Jul 2008
Location: Tampa, Florida
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Chip
Solar won't get you too far but the wind generator just might. Check out SVHotwire Landing Page they have an element for water heaters that allows you to use 110VAC or 12VDC from a wind gen. I talked with John at a recent boat show and he is very helpful.

Dan
raisin56 is offline  
Quote Quick Reply Share with Facebook
post #6 of 19 Old 02-08-2010
Senior Member
 
ardoin's Avatar
 
Join Date: Mar 2008
Location: Annapolis MD
Posts: 140
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
I'm looking for the same. The blue sky looks great and the ability to shed extra amps into a load looks good. I think you have to have a heater element that is designed for DC voltage. Most heaters have replaceable elements. Check out the link previously posted on 120/12 AC/DC heater element that might work. The main thing is to safely shed the extra amps so as not to cook the AGM batts.
As an alternate, if the shed amps don't put out enough power to heat the water, i can always generate heat with the ITR Hurricane heater without running the engine.
All the same, it looks like the best approach to shed amps from a wind generator.

Cy
S/V Music
MASON 44

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
ardoin is offline  
Quote Quick Reply Share with Facebook
post #7 of 19 Old 02-08-2010 Thread Starter
Senior Member
 
SanDiegoChip's Avatar
 
Join Date: Jun 2007
Location: Puerto Vallarta Mexico
Posts: 402
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
What I was told from Blue Sky about the SB3024DiL/DUO was that 4 130 Watt solar panels and a wind generator should be enough charging a 6 house battery bank to create hot water. It determines how much electricity you use. We do not use a microwave at all or the inverter much so it may just work out. If not I can out in an different chip (software) and go to the SB3024DiL which does not divert energy but will charge two battery banks. So I made the purchase. Kinda went for it and time will tell.
Thanks,
Chip
SanDiegoChip is offline  
Quote Quick Reply Share with Facebook
post #8 of 19 Old 02-08-2010
SV Déjàlà
 
braidmike's Avatar
 
Join Date: Sep 2003
Location: Mexico
Posts: 87
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
 
Chip, let us know when you have it installed and working. I'm mulling over the same idea for my tow-behind generator. To echo the above, I have seen 12VDC elements for the water heaters to replace the 120VAC, can't remember where...
Alternatively, most marine water heaters have a provision for heating the water by plumbing in the engine coolant waste stream. I do not have an ICE, but am thinking of a solar collector plumbed to that connection. Anyone tried that (maybe I can avoid reinventing the wheel)?
braidmike is offline  
Quote Quick Reply Share with Facebook
post #9 of 19 Old 02-08-2010
Har
SV Harmony
 
Join Date: Jan 2010
Location: Annapolis
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Chances are the solar and wind output will put out a few amps at "peak" output which is great for charging batteries but a 120V water heater draws about 12.5 amps (1500 watts) of continous juice and it needs an inverter with a high output. That kind of power isn't going to fly with renewables, think of them as a trickle charger on steriods that's all.

You would be better off enigneering a solar ciollector that circulates a glycol (anti-freeze) solution using the heater exchanger connections to transfer the sun's heat to the heaters water tank. Much less of a power draw, just a small circulator pump to cycle the gylcol through the collector and back to the water heater.

If you want hot water and don't want to plug in or run the engine this is the way to go.
Har is offline  
Quote Quick Reply Share with Facebook
post #10 of 19 Old 02-08-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Unless you have a really massive solar array, it won't really do much for a hot water heater. Water just takes too much energy to heat that way. A better way to heat hot water is to setup a small solar water heater on the cabin top. If you've ever used a solar-shower setup, you realize how hot water can get with solar heat....

Sailingdog

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

Telstar 28
New England

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)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog 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
How to empty a Raritan water heater? josrulz Gear & Maintenance 6 11-26-2009 07:03 PM
Raw water cooled issues and hot water davidpm Diesel 5 11-12-2009 05:11 PM
hot water heater question primerate84 Gear & Maintenance 8 10-19-2006 08:24 PM
Hot Shower Water Stede Gear & Maintenance 0 05-06-2003 09:13 AM
Volvo 2001 Water Heater pmccann Cruising & Liveaboard Forum 1 03-02-2001 03:22 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