(Thanks to Israel21c) Israeli start-up SolarOr has developed BIPV – building-integrated photovoltaic. The BIPV panels convert Direct Current trapped in a building into AC energy that can be used locally or sold back to the electric company.
http://www.israel21c.org/headlines/solaror-facade-panels-bring-in-suns-energy/
https://www.youtube.com/watch?v=nMulspxFPHs