Hi,
I've added some more cold weather modifications.
Last year my pass through storage hatches froze shut. That's where I store my shore power cord. I've added a 120 outlet with a switch inside the RV. I'll leave a 700 watt fan type heater plugged into the outlet in the storage compartment. If it freezes up I'll easily be able to "melt it" open by using my inverter and battery bank, or shore power. I'll rely on the 12 volt lights for the other compartments for thawing them out.
I have added a cord to power just the converter and added an outlet by the converter. I am able to run the converter and an 800 watt heater. This will leave the full 30 amps for running other heaters inside the RV.
This modification allows me to work around any low voltage situations as the converter will work right down to 90 volts (at reduced output, of course). It essential makes the RV power system into an uninterruptible power supple. Here is how I use it when there is just one 15 amp circuit:
1. plug in only the converter (and heater if it is cold)
2. plug shore power cord into an outlet powered by the inverter
3. turn on the inverter.
I've added a second thermostat to control just the furnace, so I can run both the heat strip and the furnace at the same time.