[RE-wrenches] Forced air Furnace

[Drake]

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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>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:dana at solarwork.com>dana at solarwork.com
>>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:re-wrenches-bounces at lists.re-wrenches.org><re-wrenches-bounces at lists.re-wrenches.org> 
>>On Behalf Of Drake
>>Sent: Thursday, August 23, 2018 2:37 PM
>>To: RE-wrenches 
>><mailto:re-wrenches at lists.re-wrenches.org><re-wrenches at 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/>http://athens-electric.com/
>>
>>
>>
>>
>>
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