1. Central inverters are large grid feeders and are often used in large photovoltaic systems, such as open-loop systems with a rated output of more than 100 kWp. In the normal case, central inverters feed three-phase into the grid.
2. In the case of a central inverter, all module strings are merged centrally. This is particularly useful when all PV modules are subject to similar conditions with respect to inclination and orientation. For this reason, central inverters are usually used in the case of larger roof systems or free-space systems in the format of a control cabinet or as a station in container construction. With a capacity of 100 to 1,200 kW, central inverters feed the generated solar power directly into the medium-voltage grid with a voltage of 20,000 volts.
https://www.photovoltaik-web.de/photovoltaik-lexikon/buchstabe-xyz/zentralwechselrichter (1.); http://www.energie-experten.org/erneuerbare-energien/photovoltaik/wechselrichter/zentralwechselrichter.html (2.)
Author: Markus Jödicke