the Otherpower.com Discussion Board || Comments DUMP LOAD

Front Page - [Homebrewed Electricity-- (wind) (solar) (hydro) (steam) (controls) (storage) (mechanical)] - Classifieds - Site News
Everything - Newbies - [Remote Living-- (housing) (heat) (light) (water)] - Rants & Opinion - Diaries - Our Products

DUMP LOAD | 26 comments (26 topical, editorial)

Re: DUMP LOAD (3.00 / 0) (#24)
by jzeveney on Mon Apr 21st, 2008 at 11:02:20 AM MST
(User Info)

You device looks cool however here's something I was planning on attempting.
This has not been built yet so feedback please.

Why not just use your existing hot water heater?

The elements in them should respond to DC the same as AC.(I think)

Example: The element in my existing hotwater heater is 37.5 Ohms +/- a few. This results in 4500 watt at 120volts. At your 48 volts this would be 1800 watt. Use a simple powered relay to transfer from GRID to supplus power. This will allow you to use the existing heaters thermostat for safety and you done.

Z

[ Parent ]

Re: DUMP LOAD (3.00 / 0) (#25)
by lglagasse on Mon Apr 21st, 2008 at 11:55:25 AM MST
(User Info)

It has been said here [in previous postings]that the 240 volt heating elements will not hold up. There are 12 to 60 volt elements available. Here is the link
http://hydrogenappliances.com/hotwater.html

I have two water storage tanks with heating tubes going through my wood furnace. This heats my water in the Winetr Months. All the fitting holes are used up on my two tanks.It is a very coolway to heat water.

lglagasse

[ Parent ]

Re: DUMP LOAD (3.00 / 0) (#26)
by ghurd on Mon Apr 21st, 2008 at 12:52:17 PM MST
(User Info)

I believe lglagasse misunderstood the earlier posts.
The 4500W element should hold up fine, but it would be nearly pointless.

Watt's Law 4500W/120V= 37.5 AMPS.

Best bet is the voltage is 240V instead of 120V.
So 4500W/240V= 18.75A.

And Ohm's Law 240V/18.75A= 12.8 ohms.

A 12V system dumping excess power at 14V, into a 12.8 ohm resistance is less than 1.1A, or 15W. 15W is about half of a car tail light bulb.

A 48V system dumping excess power at 56V, into a 12.8 ohm resistance is less than 4.4A, or 245W.

A 4500W heating element using 245W (or 5% of rated watts) is likely to last a LONG time.

What TomW said...
"Watts Ohms Amps and Volts all work together and it is a very simple set of formulas that help you figure this stuff out"
G-

[ Parent ]

DUMP LOAD | 26 comments (26 topical, 0 editorial)

Menu

· create account
· How to use the board
· FAQs
· search the board
· Google search the board
· Old Otherpower Board

Login

Make a new account

Username:

Password:

You must be a registered user to post here. It's easy and free, and the link is on the upper right side of your page.
All trademarks and copyrights on this page are owned by their respective companies. Postings are owned by the poster, but may be deleted or moved at the ADMIN's sole discretion. The Rest © 2003 Forcefield.
You can Email the board ADMIN here. PLEASE include the username you signed up with!