1500 Watt Solar Grid Tie Inverter, SunTeams 1500, UL-1741 & CEC Utility approved 'Sunteams 1500' Grid Tie Inverter for varity of Solar Panels ETL approved with UL-1741 for Govt. Rebate & Tax Break on Solar. Approved Performance Efficiency of 96% by CEC (California Energy Commision) MPPT function:The unit can track the maximum power point, for different Solar PV type or high & low sun radiance. Inverter feeds maximum power of PV array to the grid Reliability:Mean Time Between Failure (MTBF): 100,000 hours 5 Year Warranty from Manufacturer (Kinglongpower)