Hey Mike, I liked your video with the 2 RT-12s in the box for the kayak. I am trying to put 2 in series and 2 in parallel for a 24 volt system. When I series connect 2 of them + to - it's giving me a reading of 0.00 ??? Did you have any issues? They're all topped balanced. I don't want to screw anything up. Proceeding w/ caution. Any help is appreciated.