Wide operating voltage range: 120 550V. Wide temperature operating range: –13 – +158 °F (-25 – +70 °C). High CEC efficiency: 97.5%. Integrated AFCI (Arc Fault Circuit Interruption). NEMA 4 plus salt mist corrosion protection. Dual MPPT (6.6kw). Works great, and has taken power bill down to zero. The item “Delta Solivia 6.6kw Grid-Tie Inverter” is in sale since Thursday, April 28, 2016. This item is in the category “Home & Garden\Home Improvement\Electrical & Solar\Alternative & Solar Energy\Chargers & Inverters”. The seller is “willissolar” and is located in Weston, Idaho. This item can be shipped to United States.