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......
Ray Walters
Remote Solar
303 505-8760
On 8/23/18 5:43 PM, Dana wrote:
Drake,
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.
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.
The new ECM (electronically commutated motors) pump motors are
basically at DC permanent magnet motor power draws [Taco & Grundfoss]
these days.
Best of luck with this one.
----------------------------------------------------------------------------
Dana Orzel Great Solar Works, Inc.
*C - 208.721.7003 d...@solarwork.com*
Idaho Contractor - # 028765 Idaho PV # 028374
NABCEP # 051112-136 www.solarwork.biz <http://www.solarwork.biz>
_"Responsible Technologies for Responsible People since 1988" ___
*P*Please consider the environment before printing this email.
*From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On
Behalf Of *Drake
*Sent:* Thursday, August 23, 2018 2:37 PM
*To:* RE-wrenches <re-wrenches@lists.re-wrenches.org>
*Subject:* [RE-wrenches] Forced air Furnace
Hello Wrenches,
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.
Thank you,
Drake
Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
/http://athens-electric.com/
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