Save Energy products 1) Power Range: from 5WP to 280WP2) Mono Solar Panel3) Quality : solar cell's efficency can get to above 16-18%4) Warranty: 5 years product warranty and 20 years 80% of power5) Tolerance: +/- 3%6) Certification: UL, TUV, MCS, CEC, IEC , CE , IS7) Regarding to measure, we can do it according to your demands to produce.