SolarTherm uses Solarworld German made PV panels to generate electricity when the sun is shining, the electricity is then used to supply the needs of the house, with any excess exported to the electricity grid. The latter process is known as Net Metering / grid tied solar electricity systems.. To learn more about it please read below. The renewable energy solutions for the solar grid tied systems from SolarTherm are made possible from SolarWorld and Fronius/SMA. Alpha Solar Energy Systems is the authorised distributor in Sri Lanka for SolarWorld PV panels from Germany and a trained service plus partner for Fronius inverters from Austria, one of the leading inverter manufacturers in the world.