See photos of America's failed attempt to create a tank out of a tractor
The US Army's early attempt to create an armored vehicle fell short. See images of the flawed but influential Holt hybrid ...
pv magazine International1y
Vaysunic launches hybrid photovoltaic water heater
Chinese PV products manufacturer Vaysunic New Energy has released a new hybrid photovoltaic ... and set the water heater via WiFi. “By using a pressure-bearing water tank design, the water ...