Hehe - yeah, out here in the desert, once the sun goes down it's a different ball game.  In the Florida Keys?  At 95F/95%, the sun is not *that* relevant.  But the whole subject kind of begs the question of whether you're a Westy kind of person or not IMO.  To each their own :-)

Keith Hughes
'86 Westy Tiico (Marvin)

 ----------------------------------------------------------------------
 
 Date:� � Sun, 27 Oct 2013 21:34:22 -0400
 From:� � Dennis Haynes <d23haynes57@HOTMAIL.COM>
 Subject: Re: idea?
 
 BTDT! A famous van had an RV air conditioner on the back of
 the =
 Adventure
 wagon roof. 2 group 31 AGM batteries got that AC through the
 night. Keep =
 in
 mind once the sun goes down it does not have to run
 continuously. Be =
 sure it
 is an energy efficient unit that turns the fan off when
 cooling is not
 needed. Yes the 12 volt options are spendy but just like RV
 designed
 refrigerators they are light weight and energy efficient.
 And yes using
 batteries this way does shorten their life not to mention
 the huge =
 strain on
 the alternator if that is how you plan to charge 200 A/H of
 discharged
 battery. So unless you plan to drive a lot each day at some
 point you =
 are
 back to a generator. That van owner traveled with a 3K
 Honda(!) but he
 didn=92t want to run it at night so to the batteries he
 went. At some =
 point he
 realized he at least needed a Sportsmobile.=20
 
 Dennis
 =20