Solar cells
OK...solar cells...um yeah....I'm sure that the solar cells do nothing more than power the LEDs that they light up as at night...
Anybody who has ever used those solar cell LED path lighting that you can get at any of the neighborhood WallyMarts *KNOWS* that the solar cell barely charges the battery in the lamp to light the single LED for 4-6 hours. And this is only if you have the solar cell clean and always in the sun! After about 6 months, the solar cells on my path lighting starts to get cloudy and it loses 40-50% of it's charging capacity! How may people will be constantly wiping off the roof of their smart car to increase efficiency? NONE! Solar cells are a joke and rather pointless until they reach 40% efficiency...They've only reached 19% in labs...realworld solar cells are 10% efficient at best (in real world use...dust, bird droppings and other issues will further diminish the efficiency!)
