We use this system for the production lines at my work. It's nothing new and has been used for over 30 years in some companies in Netherlands. If you want to know more, let me know, I work with them, programme them and sometimes even drink coffee on them riding along We have some solar panels on our roof and use that for powering all kinds of machines. Still we have our own powerplant though.
Fahrerlose Transportsysteme (FTS)