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The rule of thumb I have heard with using the furnace is one night one battery...
If you are really concerned about it do the driveway test one night just like you would do at the boondocking location and see how you work out...
Use your toolbox multimeter across the battery terminals when you have the RV running and measure the DC Voltage. A fully charged battery will read around 12.6-7 Volts DC and when you start up your RV it should read 13.6VDC or higher up to 14.4VDC telling you that the RV is charging your battery.
Roy Ken
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Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
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