[RE-wrenches] Forced air Furnace

[cwarfel at entech-engineering.com]

I agree with the difficulty of FHA for grid isolated applications.  I
have an EGauge system on my house and here is a screen print of a cold,
windy period. Very high inrush current for the blower motor.  An
addition I am finishing is solar assisted radiant floor.  Chris 

On 2018-08-23 20:17, Darryl Thayer wrote:

> I agree with Dana 100% almost.  I have measured many a furnace with up to 1300 watts, 800 or 1000 watts is normal. But this furnace with larger ducts and a high temp rise (140 discharge) and ECM motor was an exceptionally low draw.  This is from memory back in about 2010, I have since had a heart attack with a heavy penalty so my memory may be flawed.   
> 
> On Thu, Aug 23, 2018 at 6:44 PM Dana <dana at solarwork.com> 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                       DANA at SOLARWORK.COM 
> 
> Idaho Contractor - # 028765         Idaho PV # 028374 
> 
> NABCEP # 051112-136                       www.solarwork.biz [1] 
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> "Responsible Technologies for Responsible People since 1988"  
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> 
> FROM: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> ON BEHALF OF Drake
> SENT: Thursday, August 23, 2018 2:37 PM
> TO: RE-wrenches <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/ 
> 
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