Running Furnace on Low Battery?

EEWally wrote:
What would happen if the furnace was needed while the battery ran low or became discharged (no AC connection)?

Your question is moot because you shouldn't ever be drawing down your battery anywhere near as low so as to cause the furnace to not ignite. Generally, you want to draw the battery down no more that ~ 50% capacity or ~ 12 volts on a regular basis, drawing down to ~ 30% or ~ 11.75 volts occasionally is considered acceptable as long as it's not done often and you re-charge as soon afterward as is practical. These voltages aren't anywhere near the low threshold voltage for your furnace OR your fridge to not operate.

I would expect the furnace to run to at least 11.0 battery volts and shut down between 10.5 and 9.0 battery volts. Maybe lower but not much.

BTW anything below 11.5 volts is hard on the battery and while I personally would still keep the furnace running... do try to get the battery charged asap next day.

Depending on the state of charge of the battery, chances are it would not light at all. The fan may run, . . . slowly. The burner won't light without sufficient air flow through the box.

Chum lee

I don't know about that furnace model, but for us when our battery was low, the furnace just clicked. We were newbies and this was our second trailer (on our fifth now).