NHTSA Complaint #11421164 — 2004 PORSCHE CAYENNE

I returned after being away for a few weeks, in May 2021. The solar panel had been on the inner windshield of the car following installation a few months prior. I found the car's 12V battery was almost dead (about 4 Volts), and the solar panel's plastic frame was severely melted, causing it to deform and lift away from the glass solar panel. Photos uploaded below. From reading reviews on this product on the Harbor Freight website, I now see that this is a common problem. I don't know what the cause is. Could be that the cheap plastic is just not made to withstand summer heat (although I have 2 more of these in my other cars, with no problems), and that the severe deformation of the frame somehow shorted something electical inside the panel that caused the car's 12V battery to discharge, heating the glass panel and melting all the surrounding plastic. Or it could be that an electrical problem was the trigger, causing the battery to discharge, etc. Harbor Freight is so far making it extremely difficult to try to raise the problem with them. I think this could be a serious issue, perhaps leading to a car fire. And if it is indeed an electrical fault that triggers this, then it could happen when parked in a garage (no solar heating needed), possibly leading to worse.