Felicity Solar IVPS Low Frequency Solar Inverter With 120A MPPT Solar Inverter, Long Lifespan, Digital Screen and Stronger Protection. Solar inverter, or converter, or PV inverter converts the variable DC output of a photovoltaic (PV) solar panel into a utility frequency alternating current (AC) that can be off-grid electrical network. It is a critical balance of system–component in a solar power system, allowing the use of ordinary AC-powered equipment