true 12 volt air conditioner

pianotuna wrote:
It is efficient. 600 watts for 8000 btu's is excellent. Compare that to a roof 13500 btu air conditioner which draws between 1300 and 1900 watt.

600/8000 = 0.075 or about 46 amps @ 12 volts or 174 btu's per amp

1300/13500 = 0.096 or about 130 amps @ 12 volts or 104 btu's per amp

1900/13500 = 0.141 or about 190 amps @ 12 volts or 71 btu's per amp

The amps calculations on the last two lines are allowing for inverter inefficiencies, but even without that the 12 volt unit more efficient. The two lines are also based on actual measurements that I've made.

Point taken.

Yet, it is efficient at emptying your pocketbook :) Out of curiousity, do you think this would last about the same, longer, or less time than a conventional unit?

It is efficient. 600 watts for 8000 btu's is excellent. Compare that to a roof 13500 btu air conditioner which draws between 1300 and 1900 watt.

600/8000 = 0.075 or about 46 amps @ 12 volts or 174 btu's per amp

1300/13500 = 0.096 or about 130 amps @ 12 volts or 104 btu's per amp

1900/13500 = 0.141 or about 190 amps @ 12 volts or 71 btu's per amp

The amps calculations on the last two lines are allowing for inverter inefficiencies, but even without that the 12 volt unit more efficient. The two lines are also based on actual measurements that I've made.

if that came with the AGM group 31's it might be better...but it doesn't look like it, so add in around $1200-1500 for the batteries.

For that you can buy a generator and lots of fuel.

It's a nice idea, wish it were more efficient or a bit cheaper.

The first thing I saw on that site was "Keep Truck Cab Cool without running the engine". Might do for a small class B van. Be no use in anything larger.

I want one. Heck, I would be happy with the four group 31 agm's.

Very interesting but, not cheap. I'm guessing the price will drop if they become popular.

Good find.
Though, a residential mini-split 9000 BTU, 900W, "inverter type", would cost $700

8000 BTU's wouldn't even keep my toyhauler garage cool. If I closed both bedroom doors in my overhead master suite, it might keep it cool. It would be little more than a fan in my main cabin.