Date:         Fri, 19 Jun 1998 09:51:27 -0700
Reply-To:     Otmar Ebenhoech <Otmar@EVCL.COM>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         Otmar Ebenhoech <Otmar@EVCL.COM>
Subject:      Re: Idea for A/C and camping
Comments: To: Vanagon List <Vanagon@Vanagon.com>
Content-Type: text/plain; charset="us-ascii"

>Ideally, you would want a 12v DC motor to run the entire system.  A simple
>"transfer" switch would allow the power to be routed to the aux.  motor and
>the a/c fans and controls.  If memory serves, ac to dc converters are
>available from JC Whitney, and the "transfer" switch could be had from a
>electrical supply company or even a Home Depot.  The fans and a/c controls
>would have to be rewired from the transfer switch so that no current flows
>back to the battery and charging system, but I do not think that would be a
>problem.

        Excuse me for not having read the whole thread, but wasn't someone
thinking of a  5 HP motor for this?

        5 HP at 746W/HP = 3730W / 80% efficiency = 4662W / 12V = 388 Amps.
Even at 2 HP you're looking at drawing 155 Amps.
The 12V DC to AC inverter and/or the 12V charger for this size would be
very expensive and heavy.

        But I like the stationary AC idea. If it's only used when plugged
into outside AC power such as at a RV place. I could see it being done with
a hermetic compressor/motor unit out of a window AC unit. This could be
plumbed in parallel with the stock AC unit. Both the stock unit and the
stationary one would need check valves.

        I wonder how this would work. Ideas?



 -Otmar-
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