Modules of the CS6W-MS series are more powerfull thanks to their design and used technologies. Modules operate at lower temperatures, that results in higher energy yelds. Modules of this series use dual cell technology. The cells are half the width, so they lose less energy. The panels are bisected longitudinally. Both halves work independently of each other. When one half is shaded, the other half is still working. They are therefore more tolerant of partial shading.
The warranty can be extended to 15 years.