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.
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.
Does anyone know how to get accurate data on furnace blower motors?
Thanks,
Drake
At 01:59 PM 8/24/2018, you wrote:
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boundary="------------914ACDD867C6488AACA07365"
Content-Language: en-US
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
303 505-8760On 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
<mailto:[email protected]>[email protected]
Idaho Contractor - # 028765 Idaho PV # 028374
NABCEP #
051112-136 <http://www.solarwork.biz>www.solarwork.biz
"Responsible Technologies for Responsible People since 1988"
P Please consider the environment before printing this email.
From: RE-wrenches
<mailto:[email protected]><[email protected]>
On Behalf Of Drake
Sent: Thursday, August 23, 2018 2:37 PM
To: RE-wrenches
<mailto:[email protected]><[email protected]>
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/>http://athens-electric.com/
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