Before I dig any further into this. What is the average FE reduction while using a/c? Both in ECO mode, normal mode and max?


while I'm here, I found this unit.
DC Airco type 4400 is designed and used for cooling small cabs, and sleeper cabs of (EU) trucks.
DC 4400 is a small lightweight dc air conditioner introduced in 1998, and modified in 2003.

DC 4400 12 volt
DC 4400 24 volt

Cooling capacity
1300 Watt – 4400 BTU
1400 Watt – 4760 BTU

Power consumption
360 Watt 30A
360 Watt 15A

Size mm

Size inches
700 W x 920 D x 265 H

27,5W x 36,3 D x 10,5 H
700 W x 920D x 265 H

27,5W x 36,3 D x 10,5 H

Weight
30kg / 66 lbs
30 kg / 66 lbs

Max. outdoor ambient
40 ºC / 104 ºF
40 ºC / 104 ºF

Low voltage settings

(Unit will shut down if there is a low voltage)
12 VDC = 10,5 volt

24 VDC = 21,5 volt

Restart settings

(If there was a low voltage the unit will restart at)
12 VDC = 12,6 volt

24 VDC = 25,2 volt


High pressure switch
24 bar
24 bar

Low pressure switch
2 bar
2 bar

Safety switches
Max. temperature compressor and motor
Max. temperature compressor and motor

Coolant/ refrigerant
R134a
R134a

http://www.dcairco.com/DC4400.html

Figure we would need about 3000 - 3400 BTU's, this is 4400, a nice safety margin of error.