I have a small trailer with a 30 amp converter/charge controller. I?d like to add an inverter, and I know I?d need a transfer switch. However, I?d also like the ability to add solar panels and when I?m not running on shore power and hence my battery is not being charged from the existing charge controller, I?d like it to switch to being charged by the solar panel. I have been searching the forum but haven?t found anyone talking about the exact same scenario. Is there a device that can handle both transfers at the same time or would I need two separate switches? I?ve read on here that you don?t have to worry about a transfer switch with solar because the charge controller you?d get with the solar panel will take care of that but I?d just assume not have to have another charge controller when I already have one built in. In my mind, it seems like the solar would be wired in upstream of the camper?s existing charge controller at the same point as the output of the existing converter and there would be a transfer switch at this point? But if I did just buy a separate charge controller I?m assuming if my existing controller is charging the battery, the solar controller, hooked up parallel to the other controller would see the voltage coming from the other controller and automatically assume the battery is charged?