Ecopower Micro solar grid tie inverter pure sine wave 10.5-28V DC to 90-140V AC MPPT with CE (300W) Pure sine wave output,mppt function Automatic Sensing Function Solar Luminosity Directly connected to the solar panels (do not need to connect the battery) Reverse Polarity Protection;Anti-Island Protection;Stackable DC 10.5-28V AC 90-140V Recommended panels Vmp 18V ,Voc 21V