Hi wolfe10,
Before I installed the trik-l-start the starting battery would be at 12.3 volts after six weeks of storage. (E-450 class C)
After installing the trik-l-start the starter battery was at 12.8 volts.
It was being 'fed' from the solar system.
I have seen the starter battery receiving 13.8 volts when on shore power using the wizard equipped progressive dynamics converter and also when using the Magnum inverter charger.
My relays draw 0.88 of an amp--not really suitable for long term storage. A locking relay would be a better choice for starter battery maintenance charging.
I'm pleased with the trik-l-start solution.