DC powered truck cab air conditioners
http://www.kingclima.com/product/view/E_Clima_Series_Truck_AC_Units.html
E-Clima Series Parking Truck Air Conditioning SystemrnE-Clima series truck rooftop air conditioning units are battery powered, 12v 24v, 1KW to 4KW cooling ac for all kinds of truck cabin solutions.
http://www.kingclima.com/product/view/E_Clima_Series_Truck_AC_Units.html