I have been thinking about building an RV type trailer to pull behind an SUV. I had an idea to build it with solar panels and an 2 KW inverter to run various AC loads like a fridge or heat pump. Not only would I like to charge the 12V batteries with the solar panels but also charge the batteries with the alternator of the car. My thoughts are to take all the solar panels each with their own blocking diode and the cars alternator output and direct that into the charge controller for a bank of 4 to 8 deep cycle batteries. Then, when the car is off, only the solar panels supply power to the charge controller. The car's battery could supply up to a 12.8VDC on it's own and the alternator supplies 13.8-14.4VDC, so I'd need a blocking diode that is forward biased at 13-14VDC.
Is this concept sound?
Would a standard blocking diode work for this?