Im going to install a small 5000btu a/c in the back door, NOT window of my van, has anybody else here done this? It's rated at 500wts and somebody gave me a 600wt inverter would that be enough power?

here is a few pics of one installed in a ford

 

You will probably need a 2500 watt inverter capable of handling startup surges 1500 watts higher than that.

Your alternator will not be able to keep up 95% of the time and you will find yourself going through batteries like candy.

The AC in the back door is good for being parked when you have grid power or a generator. Unless you heavily insulate your van and park in the shade, it will only slightly make a dent in Florida's summertime heat.

 

My Idea was...Duel battery isolator with a deep cycle battery for the a/c through a 1200wt inverter because the a/c is 500wt maybe 900wt when the compressor kicks in ? sound do-able?

 

I don't think you understand how fast a continuous 500 watt load will drain a battery. I don't think the alternator could keep up.

Perhaps if you could plug in the battery and fully charge it every night you could make it work

. Check out this thread

http://www.expeditionportal.com/foru...ir+conditioner.