Car Parts
12V/24V RV Air Conditioner, All-in-1 Unit RV Rooftop Non-Pipe-Mounted, Truck RV Air Conditioner Unit for Buses, Campers, Trucks, RV (12V)
It can be used for 8 hours after a power outage: no need to worry about any troubles after a power outage. Internal undervoltage protection, it can still be used for 8 hours after parking Many places of application: can be applied to most vehicles....
https://www.bizrate.co.uk/carparts1/12v-24v-rv-air-conditioner-all-in-1-oid31014122630.html