Date:         Sun, 15 May 2011 15:51:19 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Rooftop A/C Experiences 12 volt ac more  seriously-Note
Comments: To: Jeff Schwaia <vw.doka@GMAIL.COM>
In-Reply-To:  <4dd01750.040b440a.2e55.09cd@mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 02:11 PM 5/15/2011, Jeff Schwaia wrote:
>Don't know about the Thermo King, but the Red Dot that I linked to is all
>electric as well.  Also, it only uses 33 amps (@ 12V) as opposed to the DC
>Airco's 50 amps.

Also, Jeff, 16,000 BTU/hr with 400 watts consumption is an EER of 40
which is completely out of sight.  The DC Airco  8500 (~50
amp)-17,000 (~100 amp) BTU/hr units seem to be running EER about
14-15 which is well over the 10.7 EER required for an Energy Star
rating for a window A/C and somewhat below the 16 required for a
whole-house unit - since these are window-size machines that's
excellent efficiency.*

*Probably not directly comparable since the Energy Star and EER
ratings are based on AHAM (?American Heating and Air Conditioning
Mfrs Ass'n?) specs and these aren't; but the "EER" or energy
efficiency rating as such is a bastard unit: BTU/hr divided by watts.

Yrs,
d