1. Maximum power of sunroof: 36W 2. Maximum power of voltage:21V 3. Maximum power of current:1.72A 4. Open circuit voltage:25.2V 5. Short circuit current:1.86A 6. Dimension: 81.5*41*3.5mm Structure: EVA + Slicon Cells + EVA +Glass Application: Audi A8 or else You should first tell me your exact size of your car and the up window. Fuction: 1. The sunroof operates a fresh air fan which powered by the sunroof when the vehicles is parked in the sun so as to reduce the temperature of car. 2. The solar sunroof will be connected with battery of car,it also can charge the battery when sunshine irradiate the sunroof.