|This Is Why You Need Heat!|
|Common 2 Battery Installation (This One Is Mine)|
I've heard of folks getting 7 or more years from their set of batteries if properly maintained!
|Typical RV Furnace|
This is what I do in the winter....figure out what projects to research and develop for testing in the spring. It can get very interesting around my house when the midnight oil begins to burn. The whole Solar Charging Project began the same way.
Again, YMMV...but this should give you start.
Rich "The Wanderman"