The manufacture states that my 2018 Sonoma has two 20# LP tanks. Does that mean gallons? On the tanks themselves it says 8.5. I am unsure what these numbers mean. At any rate it wasn't enough for a 4 ...
That would be an inverter (i.e. 12 volt DC to 120 volt AC)
Once my water heater has reached full temperature, it will cycle every 4 hours and runs for about 15 minutes. On the other side of the coin, if I turn it off after the first cycle there is enough warm water for hand washing and dishes for the day. That saves quite a bit of propane.