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For lead acid battery they don't recommend going below 50% charge (12.06vdc, just round it off to 12vdc. If you dont have a battery monitor system, use a multimeter OR the level up control panel. It reads out your voltage).
Let's say you have a 100Ah battery (50% usable) and the furnace draws about 10A.
100÷2÷10= 5 hours.
Most likely you will have less than that due to other electrical draws.
Maybe 3.5 hours.
You can plug in your truck to supplement that.
A lithium battery you can take down to 10%. One of their advantages. HOWEVER, you cannot charge a lithium battery at below freezing temperatures.
A lead acid battery doesn't care about freezing temperatures.
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