Just for safety's sake, make sure you do not hook up the cranking battery in this loop. I wouldn't mess with it just in case....
I have on board chargers on all of my stuff. But, I do not have one that is self contained as you have explained it. I tried to do almost the same thing with a surge protecter in the house one time. It didn't work at all.
DP
I am a heterosexual male. 2 Chronicles 7:14
"If my people who are called by My name will humble themselves and pray and seek My face and turn from their wicked ways, then I will hear from Heaven and will forgive their sin and heal their land."