Mecer 275W Polycrystalline Solar Panel module. Maximum Power (Mp) = 275W; Power Tolerance = 0- 5W; Efficiency = 16.90%; Open Circuit Voltage (Voc) = 38.6V; Maximum Power Voltage (Vmp) = 31.3V; Short Circuit Current (Isc) = 9.31A; Maximum Power Current (Imp) = 8.79A; Temperature Coefficient of Isc = 0.06%; Temperature Coefficient of Voc = -0.33%; Temperature Coefficient of Pmp = -0.45%