Elon Musk is a visionary: after the electric car, the battery storage of electricity generated by domestic solar panels that is used to charge said car, he understood that the photovoltaics pannels are unsightly when placed over roof tiles or slates. So he is inventing photovoltaic roof tiles and slates that are almost unvisible …. He’s got now to get rid of the lithium material and replace it by carbon or sodium and he will have completed the virtuous loop, guaranteeing a worldwide commercial success, and a totally sustainable development!
Vision+R&D+Finance = success with no doubt!