1,high efficiency 2,long life 3,easy installation 4,high wind and hail impact resistance Polycrystalline Solar Panel--270w1,SpecificationWeight:23kgCell:156mm ×156mmNumber ... ,Temperature Coefficients:NOCT48°c±2°cCurrent temperature coefficient%/K0.06±0.01Voltage temperature coefficientmV/K-(155±10)Power temperature coefficient%/K ...