I put in a method past year. Flexible device, taped it to the top (dbl adhere 3M) ran the wires towards the charger box (includes the unit). The max output is 100 watts which isn't a good deal but in case you park while in the Sunshine for several hours https://kylerzmvel.blogofchange.com/35664091/helping-the-others-realize-the-advantages-of-resistors