Low voltage Air Conditioning [RE-wrenches]

Darryl Thayer daryl_solar at yahoo.com
Mon Apr 21 12:36:07 PDT 2008 

on the unit selection, it seems that at one time sun
frost or Danzer had such a unit.
DT
--- Chris Meier <chrism at unirac.com> wrote:

> 
> 	This seems like a good way to do it. I would look
> closer at the
> BTU requirements. 20,000 Btu is a 1 1/2 tons of AC.
> It would feel like a
> meet locker in most sleepers and sound like a
> turbine. Unless the out
> side air temp is 160 to 180 degrees. Most sleepers
> are insulated for
> sound reasons and are sealed from air leakage. By my
> calcs the heat gain
> in the Nevada desert would be 1/4 ton or 3000 BTU
> (very Conservative).
> Because the truck has AC you would be able to drop
> this more if the new
> AC unit is expected to maintain the temp after the
> truck is turned off.
> If you want the new AC unit to pull down the temp
> say 100 degrees to 70
> degrees without the use of the trucks AC a 3000 BTU
> unit would be fine
> but over kill once the design temp has been meet.
> 	From my driving days I would rather use the truck
> and AC unit to
> pull it down then turn the truck off and let the
> unit maintain the temp.
> This would mean less airflow so less sound for the
> driver to get use to.
> 
> 
> 	I am not up on DC units but I think small camper
> roof top units
> are DC and would be more in line on the power
> consumption side.   
> 
> Chris Meier
> 
> Product Manager
> 
> UniRac, Inc.
> 
> 1411 Broadway Blvd. NE
> 
> Albuquerque, NM   87102-1545
> 
> Ph:  505-242-6411 
> 
> Fx:  505-242-6412
> 
> Email:  chrism at unirac.com 
> 
> Web:   http://www.unirac.com
> 
>  
> 
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>  
> 
> 
> -----Original Message-----
> From: Travis Creswell
> [mailto:tcreswell at ozarkenergyservices.com] 
> Sent: Monday, April 21, 2008 11:18 AM
> To: RE-wrenches at topica.com
> Subject: RE: Low voltage Air Conditioning
> [RE-wrenches]
> 
> 
> Hello Larry,
> 
> You mention a "small diesel generator".  Are you
> talking about an
> Auxiliary
> Power Unit or a generator?  APU's are becoming
> really popular on trucks
> from
> what I've seen.  They are generators and air
> conditioners so they take
> care
> of two birds with one stone.  Here is an example of
> one.
> http://www.rigapu.com/index.php  I have no
> affiliation with them, it's
> just
> the first hit on Google (who I also have no
> affiliation with).  They
> "comply
> with strict idling laws" so I would assume they are
> allowed.  I'm sure
> it's
> pricey but so are all those batteries.  By the way,
> where are you
> planning
> to put 18kWh worth of batteries?  That's ~8 L-16's
> or ~14 T105's by my
> math.
> Plus that weight results in that much less freight
> he can carry which
> might
> be a deal breaker all by itself.
> 
> According the specs; 20,000 BTU of cooling capacity,
> 6kW generator and
> 60
> amps of DC output, .3 gallons per hour at full load.
>   Hmnn...these
> could be
> a solution for off gridders that wanted/had to have
> air conditioning.
> (No
> comments needed from the efficiency peanut gallery,
> please)
> 
> Best,
> Travis Creswell
> Ozark Energy Services
> 
> 
> -----Original Message-----
> From: Larry Crutcher, Starlight Solar
> [mailto:larry at starlightsolar.com] 
> Sent: Monday, April 21, 2008 11:27 AM
> To: RE-wrenches at topica.com
> Subject: Re: Low voltage Air Conditioning
> [RE-wrenches]
> 
> 
> 
> Wrenches,
> 
> I did not get a response to my post from last week.
> I know most of you
> do
> not work with battery based systems but is there
> anyone here that can
> offer
> some experiential advice about low voltage air
> conditioning? 
> 
> Thanks again,
> Larry Crutcher
>   ----- Original Message ----- 
>   From: Larry Crutcher, Starlight Solar 
>   To: RE-wrenches at topica.com 
>   Sent: Thursday, April 17, 2008 11:30 AM
>   Subject: Low voltage Air Conditioning
> [RE-wrenches]
> 
> 
>   Does anyone have experience with DC air
> conditioning equipment? I have
> a 
>   customer with a semi truck and wants a roof air
> for the sleeper.  Many
> 
>   truck stops now forbid engine idling for more than
> 5 minutes so they
> can 
>   not use the cab air. 
> 
>   A small diesel generator is one solution but the
> trucker is not sure
> if 
>   some truck stops may forbid that as well. Since
> the truck engine is
> only 
>   off for 10 hours or so, it looks like 18kWhr of
> battery @ 50% DOD
> will 
>   operate the A/C load until the engine starts
> again. 
> 
>   Some customers in Mexico are running mini-splits
> successfully but I 
>   don't want to add the complexity of an inverter if
> there is a low 
>   voltage DC solution.
> 
> [Non-text portions of this message have been
> removed]
> 
> 
> 
> No virus found in this outgoing message.
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> 4/21/2008
> 8:34 AM
>  
> 
=== message truncated ===



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