I am working on a large RC/autonomous rover that has 4 wheelchair motors and will be outside for many hours. I have decided on a few different ways of powering it. I currently have a 12 volt, 35 amps and hour sealed lead acid battery, I may get more, not sure yet. I also am thinking of getting a 100-200 watt solar panel to charge the battery(s) and run the rover. In addition, I have a 1000 watt gas generator with 3, 12 volt 30 amp AC adapters.
So the issue I have is switching between these power sources automatically, and gracefully. I was going to just use automotive relays to switch between the generator or batteries but this feels wrong. Is there any way I can get or possibly make a “black box” that will take different 12 volt inputs from the battery/AC adapters/solar and make a single 12 output? Ideally the generator will only run if the battery is low and there is no solar.
Thank you all for your help!