KOSTAL Industrie Elektrik PIKO CI 30

What the KOSTAL Industrie Elektrik PIKO CI 30 does

A solar string inverter turns the direct current from a rooftop array into grid-quality alternating current for the home, and feeds what the home does not use into the grid. With 30 kW of AC output, the KOSTAL Industrie Elektrik PIKO CI 30 suits an array of about 30–39 kWp, as installers commonly size the panels up to 30% above the inverter's rating.

In Germany, an array of the same size produces about 27,000 kWh a year, assuming a conservative 900 kWh per kWp: worth €2,079 a year fed into the grid at 7.70 ct per kWh, and up to €9,990 used at home instead of buying power at 37.0 ct.