Low voltage Air Conditioning [RE-wrenches]

[Travis Creswell]

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]



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