that's why we have a Honda 2000, to recharge our two 12v batteries after 3-4 days of furnace use.
but we dry camp almost all the time so it was worth the price.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package