Folding panel made by a customer in Washington. This uses 2- 145 watt panels and a Morningstar 15 amp MPPT charge controller. Here is a quote from the e-mail he sent: "This is Tom in Walla Walla.........I finally finished the portable unit we have chatted about.......with a MPPT controller I am getting 16.5 volts and 12 amps, and that is not even a bright day! I have included a few pics so you can see how I did it". This gives a good idea of what it takes to do a custom folding panel.