Originally Posted by Sgkh1947
I would appreciate any information about using the heated tanks when antifreeze has been added to the tanks. The temps will get down to single digits. My interstate is hooked up to 30amp service but is outside. It has been winterized but the batteries have not been removed. The shop can't get to it for several weeks and I can't do it myself. Should I run the coach heaters also?
You do not need to use your tank heaters while the plumbing system is winterized.
be best to turn off the inverter/charger during such cold temperatures, unless you know for sure that the house batteries have the Magnum temperature probe— some 2015 models have it, and I'm pretty sure the 2016 models do, but "pretty sure" is not completely sure. Waiting until the batteries warm up to recharge them— especially if they're already fully charged and you're not using them— is better than trying to charge them at low temperatures without adequate temperature compensation on the charger.
As for running the furnace while the van is stored, don't. While it will keep the interior warm, it will also lead to condensation on every cold interior surface, such as all of your many windows. While the plumbing system is winterized, your Interstate is just another automobile, albeit a big one. Treat it exactly the same as you would treat your other vehicles in the cold. There's no particular need for it to be kept warm inside if you're not using it.