I am planning on driving for 7 straight days in a campervan in Iceland. I have a 3DR solo and 5 batteries but I am certain I will need to have all 5 charged each day because there is something amazing in Iceland every 10 feet. I am driving a minivan with standard power options. Aside from stopping to find an outlet to plug into, can anyone think of a way I could charge the batteries? My first thought was a separate car battery but I am not sure if thats a good idea. I do have a power inverter, and I can connect it to the van battery when we are stopped. But that is not ideal as we will be trying to keep moving around the island. All suggestions are appreciated.