I had to do some quick reading about this system as I’m not familiar with it. It appears that it replaces the OEM battery with two AGM’s that have a smart isolator between them, correct?
What was the OEM starting battery? Flooded, or AGM?
A DC-DC charger could be added to keep the second battery charged correctly. It will do nothing for the starting battery though, so hopefully the Jeep’s charging system supports AGM. If not, I would not have purchased this system.
IMO, a DC-DC charger could be installed between the starting battery and the second battery. But, it would need its own isolation solenoid (non-intelligent, not voltage sensing) on the input wire to the charger that is only energized when the engine is running. Otherwise, the DC-DC charger would continue to charge the second battery when the engine is off.
Voltage from the second battery will not back feed to the starting battery through the DC-DC charger. It will boost the voltage going to the second battery though, and provided it supports AGM charging, will keep it fully charged. Let the Jeep charging system keep the starting battery charged, and leave the Genesis system intact so it’s fully functional.
If the OEM starting battery wasn’t AGM, you might consider reinstalling it as the starting battery, and selling or repurposing the AGM.
:):)
