My bed heater is rated for 120 watts at max. I never run mine above 2 so I probably only use 20% of that, maybe less.
Overnight, 8 hours or so, I'm guessing it would consume around 20 amp hours or so. If i were to use it as you described I'd probably just turn it on and run it for an hour before i go to bed to take the chill off the bedding then shut it off. When weather is really cold i just put an opened up sleeping bag over the regular bedding and turn the furnace down to 60. That's a lot warmer than a lot of nights I've spent in tents over the years and never got cold.
Originally Posted by FamilyCamper296
Any idea how many amps the bed (integrated mattress) heaters would draw on our FR HW 296? Looking into installing a Xantrex 1000 watt inverter so the wife sleeps warm. We have 2 6v AGMs with 300 amp/hr bank currently installed. Not a total thread hijacking...moderately related topic. Appreciate your help.