The Sun Series Grid Tie Power Inverter 1000W is a high-quality unit designed for solar power systems. Featuring MPPT charging mode and overload protection, this Grid-Tie inverter ensures optimal performance and safety for your solar power system. Made in China, this monocrystalline solar technology inverter is a reliable choice for powering your renewable energy setup. The item is open box, and UNTESTED. I pulled this item from the plastic and styrofoam and sealed box for pictures, and to find out what it was because I had no idea to be honest.