The test Run. It is 42 outside, heater has been on for about 10 minutes on lowest setting. It's about 64 inside the RTT. All the windows are zipped up. Temp is slowly climbing.
Added a high and low temp cut out for the lithium battery charging. Off at 35 degrees and off at 110 degrees. Lithium batteries will be damaged if you try to charge them at low and high temps. The relay both prevents charging from the DC to DC charger and from solar charge controller. This was an enormous amount testing. I first tried digital thermostats but settle on analog since they don't draw vampire power.
Made 2 under seat boxes to hold misc stuff and to store the jack which was mounted in a really stupid location in the cargo area from the factory.
Again, this is all a prototype to see how it works out.