Re: How about cars? (Score: 1) by email@example.com in Outfit your windows with transparent solar panels? on 2015-08-10 20:00 (#H0C9) 5% per year is plenty frequent. That's a 50/50 chance over 10 years. If you've got two cars, make that a 100% chance you'll need to replace one of them in 10 years. And none of this is including all the years people drive around with a cracked/chipped windshield before replacing it. That's not long enough of a horizon for solar panels, which should last 30+ years, easily.