... +/-10% output power tolerance3,Proven materials,tempered front glass,and a sturdy anodized aluminum frame allow modules to ... mountily configurations4,Combination of high efficicncy and attractive appearance Quality and Safety1,25 year 80%,10 year 90 ... ,Product Quality warranty & products Liability Insurance to guarantee and user' benefits4,Certifications TUV Intercert, CE Temperature Coefficients ...