It seems straightforward, but it is only the improved efficiencies in solarcell and battery technologies, even over the last year, that has made this at all possible.
Instead of selling individual units, they would offer a low-power system that relied on a solarcell or car battery in remote areas without grid electricity.
Instead of selling individual units, they would offer a low-power system that relied on a solarcell or car battery in remote areas that didn't have grid electricity.
And just think of the possibilities if you are trying to raise money for an unfinanceable solarcell, windmill, electric car, biofuel, or battery company!