4 -six from sams club. My FW, frig on propane just sitting uses about 12 amp hours a day. Using it with no furnace time it will use about 30 ah per day. Throw in nights in the 50's and it will use about 50 to 60 ah per day. So during warm weather I can probably go 3 days and be down about 120 ah and be sitting at 12.2 volts. Batteries are 420 ah but I stay above 12 volts.
We dont invert the heavy stuff. We use a 600 w inverter for our 40 in led tv, 24 in tv, ceiling fan, phones and laptops. Also have all led bulbs which use far less battery. about 1/5th if I recall correctly.
Honda 3000
Bogart solar and Trimetric
520 watts Cynergy panels