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From what I have seen with the EV croud many use the 12V systems the main brands they use are the Masterflux and I want to say Sierra. By the time they are done getting all the stuff figured out they are spending well over $1,000 close to $1,800. For me I think this is to costly and it would mean a lot more figuring out as you have to design the complete system from scratch.
This is one of the big advantages of the AC window units is that you have everything there minus the inverter. Everything is a contained complete system designed to work together all ready so no figuring out on my part. All the engineering has been done. The only thing you need to purchase is the inverter. A very robust inverter can be had for under $300. So in theory you could have a relatively descent working AC for around $500.
Another big advantage is that you can simply unbolt it and take it out 7-8 months of the year since it is a self contained unit.
I know it can be done as there are plenty of people right now with pure EV cars using these window units. So I am not reinventing the wheel. The only problem is that they went with 5,000 btu units which they said were under powered for there cars. They all wished they went with a unit with more BTU to cool the cabin quicker. Now all of these cars are much bigger than the Centurion and by fully enclosing the rear hatch area and separating it from the main cabin I will have less area to keep cool. So I am betting that 5,000 BTU might be just the right size for the Centurion.
I have other uses for a good inverter anyways so I do not mind spending the money and seeing if I can get something solid working.
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