ROCKS THAT MAKE ELECTRICITY
  Photovoltaic (PV) solar cells are silicon-based solid-state semiconductor devices that convert light from the sun directly into electricity.
There are no moving parts and no external fuel is required.
  The phenomenon occurs when photons of light provide the electrons enough energy to create a current flow.
The current produced is DC, which is then converted to AC via an inverter ("solar electric interface") for use in your building's current electrical system.
When your solar system makes more power than Your building uses it spins The meter backwards.
These electrons (kWh) get recorded as a credits: The Grid is your Battery.