i stored a car in a barn that did not have electric so i put this on the outside wall under cover and it keep the battery well charged. in fact it was not in direct sunlight and worked well. i have two available @ 50 bucks each, 65" x 39". you will need a buck regulator to control the voltage down to 13.8 volts. 10 dollar item. no TEX OR EMAILS they will not be read and will be deleted, and i will block the number calls only @ 9zero8.7six3zero72two..