DC heat? [RE-wrenches]

[Bob Ellison]

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I just did a conversion (re-repair of a 20Kw Jake that didn't work when
the customer put it together.) 
The Jake is converted to 48 volt by 3 custom converters to charge the
battery banks. 
It feeds a pair of VFX3648 inverters and ultimately 3 racks of 24 each
L-16's. He has 1 rack at the present time, more on the way with 3 water
heaters as dump loads.
These are used frequently as he is within site of one of out wind farms
and has a great wind regimen, possibly too great!
The hot water is feed to his in floor system and holds the boiler off at
least that is the plan. With winter coming we will know how it
works.....
If the water is at temperature and the batteries are full, he put 3
banks of radiant heaters on the outside back wall of the power building
to dump any excess power from the turbine that does not get used any
where else. Those make me somewhat nervous, but he is unconcerned. 

This stuff can be made to work but he will need several tanks as one
probably will be too small for the output in a good wind area. Best to
have a HUGE battery bank with a back up of ssome type also!!


Bob Ellison



-----Original Message-----
From: Geoff Greenfield [mailto:Geoff at Third-Sun.Com] 
Sent: Monday, November 21, 2005 4:58 PM
To: RE-wrenches at topica.com
Subject: DC heat? [RE-wrenches]


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Happy holidays all you listers...

I have been presented with an interesting customer design I want to
improve...

They have an S-load of wind (15 m/s... about 7kw most of the time) and
are looking at a Bergey 7.5 48 volt unit with a pair of VFX3648s and a
string of L-16s.  Very few AC loads - mostly they plan on powering an
electric hot water tank that will serve a radiant floor system (all yet
to be built).

So - doesn't it mak a lot more sense to A) heat the water with DC
elements eliminating the conversion loss and or B) heat the slab
directly with some sort of DC resistance wire....

And if B, then C - where and what (I have seen AC floor heating grids -
any source for DC?)

The entire concept of "heating" with renewable energy (other than
passive
solar) is so foreign to me that my brain locks up just going there.  BTW
- this is a birth center/health clinic in Bolivia.  Already planning on
a voltage relay to take out the heat circuit at low voltage.

For a brighter energy future,

Geoff Greenfield
NABCEP Certified Energy Practitioner

THIRD SUN SOLAR & WIND POWER Ltd.
340 West State Street
Athens, OH 45701

www.third-sun.com
(740) 597-3111

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