Solar electricity will be nearly free shortly, so efficiency isn't an important issue. Cost still is of course. Solar is becoming so cheap that an excessive a

Solar electricity will be nearly free shortly, so efficiency isn't an important issue. Cost still is of course. Solar is becoming so cheap that an excessive amount of generation will be installed, so adequate generation will be available in morning or evening, or with clouds. During peak sun, excess power will be basically free, so any battery can be charged during these periods at little cost. Wait and see if skeptical.