Fronius has been engaged in the field of renewable energy, and in particular solar energy, since 1992. The first Fronius inverter, the “Sunrise”, was developed in 1995, marking the birth of Fronius Solar Energy. The third and youngest of the three Fronius Business Units was responsible for a revolution in 2001, when on the roof of the former production site in Pettenbach, the Fronius IG came into being. This was an immense, innovative leap forward in the field of inverters. For the first time plug-in cards were used to upgrade the device, for example with a WLAN module, giving it a future-proof feature that had never before been deemed possible. The product lifetime of the inverter clearly demonstrates its exceptional quality; it was not until the end of 2015 that the Fronius IG was discontinued.