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A wood stove heats the house, and will be the primary source of heat. An
un-vented propane wall heater is installed and can heat the small, earth
bermed, well insulated structure. A furnace will be a nice supplement,
and will quickly pay for itself in insurance savings. During even a
moderately cloudy day, it will be fine, but will not be used much on
batteries. Still, I'd like as efficient a model as possible. <br><br>
If I can find a unit with a 400 W draw, like the one in our on grid
house, that would be adequate. The specifications I've found on the
blower motors are sketchy. I will likely need to order it on line (or
take a trip to a neighboring city), so reading the nameplates might not
be so easy. <br><br>
Does anyone know how to get accurate data on furnace blower motors?
<br><br>
Thanks,<br><br>
Drake <br><br>
At 01:59 PM 8/24/2018, you wrote:<br>
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I always try to talk the client into hydronic heating with ECM drive
circulation pumps. They do make ECM drive blower motors that can be
retrofitted in some furnace systems. Overall, its just a bad
combination off grid: the worse the weather is the less PV production you
have, and this corresponds to the same time that the furnace is operating
12 hours/ night. They are either running the generator a bunch, or
waking up in the morning to a cold house with the power off, and dead
batteries. If its an AC coupled system, they won't even have any PV
production the next morning either. This is another reason AC
coupled is not a great idea, or at least you need to always have some DC
coupled PV as well, but I digress......<br>
<br>
<pre>Ray Walters
Remote Solar
303 505-8760</pre><font face="Courier New, Courier"></font>On 8/23/18
5:43 PM, Dana wrote:<br>
<blockquote type=cite class=cite cite="">Drake,<br>
All the conventional units I have amp clamped over the years are pushing
900-900+ watts per hour. I do not recommend them ever & to date I
have never found a lower wattage blower. I would assume that a permanent
magnet motor would fit this suggestion, but I have not found one.<br>
For off grid I recommend: Radiant floor heat first and hot water base
board second long before hot air. Air is a better insulator than a heat
transfer agent.<br>
The new ECM (electronically commutated motors) pump motors are basically
at DC permanent magnet motor power draws [Taco & Grundfoss] these
days.<br>
<br>
Best of luck with this one.<br>
<br>
----------------------------------------------------------------------------<br>
Dana
Orzel
Great Solar Works, Inc. <br>
<b>C -
208.721.7003
<a href="mailto:dana@solarwork.com">dana@solarwork.com</a><br>
</b>Idaho Contractor - #
028765 Idaho PV #
028374<br>
NABCEP #
051112-136
<a href="http://www.solarwork.biz">www.solarwork.biz</a><br>
<u>"Responsible Technologies for Responsible People since
1988" <br>
</u><b>P</b> Please consider the environment before printing this
email.<br>
<br>
<br>
<b>From:</b> RE-wrenches
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">
<re-wrenches-bounces@lists.re-wrenches.org></a> <b>On Behalf Of
</b>Drake<br>
<b>Sent:</b> Thursday, August 23, 2018 2:37 PM<br>
<b>To:</b> RE-wrenches
<a href="mailto:re-wrenches@lists.re-wrenches.org">
<re-wrenches@lists.re-wrenches.org></a><br>
<b>Subject:</b> [RE-wrenches] Forced air Furnace<br>
<br>
<dl>
<dd>Hello Wrenches,<br><br>
<dd>What is the best choice for a propane, forced air furnace for an off
grid house? We would prefer one that doesn't have a phantom load,
although the transformer for the thermostat may not be avoidable. Low
blower current would be preferable. The furnace AC will be powered by a
Magnum 4448 PAE.<br><br>
<dd>Thank you,<br><br>
<dd>Drake <br><br>
<dd>Drake Chamberlin<br>
<dd>Athens Electric LLC<br>
<dd>OH License 44810<br>
<dd>CO License 3773<br>
<dd>NABCEP Certified Solar PV <br>
<dd>740-448-7328<br>
</i>
<dd><a href="http://athens-electric.com/">http://athens-electric.com/</a>
<br><br>
</dl> <br><br>
<br><br>
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