[RE-wrenches] Forced air Furnace

[Ray]

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 - 208.721.7003Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  dana at solarwork.com*
>
> Idaho Contractor - # 028765Â Â Â Â Â Â Â Â  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-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/
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20180824/bbba3a41/attachment.htm>