Tom,
You ask a question that none of us have an answer for including me. I have been looking for 8 years for the Heliotrope solar controller. As I stated in reply #3, the output from the Heliotrope controller goes to the back of the "disconnect switch". It is connected to the same lug as the battery positive cable.
The prosine owner's manual shows a picture of the "reset button" on the side of the inverter/charger. However, I am beginning to think that may not help because the charger is working. Without the remote working, you can't turn the inverter on. You may have to replace the inverter/charger. Years ago, Xantrex bought Prosine and then discontinued it. Hope things work out for you. Fred