An on-grid string inverter is an independent box that is normally introduced near your primary help board and power meter. There is typically only one single inverter, or possibly two string inverters on each residential solar installation, it depends on the overall solar power system size. String inverter capabilities in a series circuit, with their ordinarily being 6 to 12 individual sunlight-based chargers in what is known as a "series string." SMA is a leading manufacturer of string inverters.