SolarEpic 1000W Grid Tie Inverter MPPT Stackable Pure Sine Wave 10.8-30V Solar Input 90V-140V Output Fit for 12V Solar Panel MPPT Range 15.5-23V Vmp(of a solar panel) must be in the MPPT range to ensure the good output efficiency Doesn't work with 12V battery Island Protection Max Power Point Tracking and Stackable