We just spent the weekend dry camping at Shenandoah National Park and the night time temps were in the 40's, the battery had no problem running the furnace over night, the battery meter was showing about 1/2 charge each morning. We ran the generator a couple of hours each day to charge the battery back up. Saturday was cold and rainy, never got out of the 50's, so we were in the camper with the lights (LED's) on most of the afternoon and night with the water pump and furnace kicking on every once in a while, the battery still showed about 1/3 charge Sunday morning.
2008 Fun Finder X240
2003 Chevy Avalanche 2500