furnace [RE-wrenches]

[Travis Creswell, Ozark Solar]

Hi Ray,

Of course a gas fired AC unit is a totally different creature than a gas
furnace.

Check out that link I attached to my original message.  There some gas
furnaces that use less than 200 kWh's a year (season?).  Others with
similiar BTU and AFUE ratings using over 800 kWh's.  I'd like for some
others to check that link out and tell me what they think that means.  I
don't know if includes the phantom load but would guess it doesn't.  It
makes no mention of how many hours per day nor days per heating season
either.  All of the those items would be critical things to know.  Making
some real general assumptions of an well inusated house and a 4 month
heating season (120 days) that could mean aprox 1.5 kWh's day.  Using at
least 20 kWh battery bank one could get buy with very little gen run time.

Yes, I do totally agree that it's still a bad load.  I have never had to run
one in an off grid application but do have plenty of grid tied homes with
gas furnaces that are backed up by an SW or two.

Travis
----- Original Message -----
From: "Ray Walters" <remotech at taosnm.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 18, 2002 5:15 AM
Subject: Re: furnace [RE-wrenches]


>
> >Watch out about trying to run new furnaces with inverters (even SW's).  I
> >know of several examples where the unit won't work.  A variable speed
blower
> >motor might have some real problems as well.
> >
> >Travis Creswell
> >Ozark Energy Services
> >
> >
> Trace's SW (Step Wave Series)definitely causes probs with the variable
> speed blowers in Trane products. A 50 microfarad cap across the inverter
AC
> out seemed to cure that ill, but overall the gas fired Air conditioner
> still pulled almost 2500 watts for a 3 ton unit and had to run all day to
> even begin to cool down the vacation home. Definitely a generator load. I
> try to stay away from PV powering  any standard forced air systems.
Anybody
>  ever try those PV direct swamp coolers?
>
> Ray

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