On Sat, 22 Mar 2008 09:19:58 -0400, "Roger Long"
wrote:

The conversion from fuel to electricity to charging and back to motive force
has got to use up more fuel than just running the compressor directly.

That's true if your only requirement is refrigeration. Since I'm a
bit of an electrical junkie I'd probably opt for the big alternator if
I only had room for one or the other. It is possible to get high
output alternators in a small frame however. I have a pair of them on
my boat which are no bigger than the originals.

http://tinyurl.com/249bwl

or

http://tinyurl.com/ynr2l5