I have an old jeep xj with parasitic loads and an agm starter battery (Optima red). I understand that the stock alternator only charge 80% of the agm battery. Plus I have other loads like lights a fridge and so on.
The car is parked outside days sometimes Weeks. So I instead of using an external battery charger like nocco to top off the battery when I want to use the truck I want to put solar to keep the battery charged.
I want to install 240w solar panels and a victron smart solar controller to the starting battery. So I can keep the fridge running and keep the agm battery 100% charged.
My intention is that while driving during the day both the alternator and solar would be charging the battery.
Can I do that?
Could the alternator affect the solar controller?
Do I need to install a diode to prevent electricity running in the wrong direction inside the solar controller?
All the documentation talks about connecting a service battery but nobody talks about the starter battery.
My use case doesn't justify a second battery because I have limited space and want to keep the weight low. The fridge has low voltage protection. And if the lights drain all the battery I carry a portable li-ion battery starter to start the truck.
I might eventually put a smart shunt to protect the battery.