That was a thought as well, plug a small converter into an extension cord and run the fans off it. The trailer is used for storage/workshop (in a limited capacity) and for moves. Only time I'd really NEED to run the fans is once it's parked for an extended period of time. Would look into wiring to a switch and to the battery later down the road. Would just need to figure out how to stop power from going from converter to battery, just in case it gets parked and someone bumps the switch... But that can be dealt with later