We provide you only A-grade and proven modules of world leading manufacturers. All of the modules have european certificate CE, they passed sophisticated quality tests TUV Rheiland IEC61215, IEC61730.
Standard minimum warranty is 5 years on material, 10 years of 90% power output warranty and 25 years of 80% power output warranty. Some producers offer longer warranties like linear power output warranty or 10 year product warranty. All main manufacturers are involved in PV Cycle- system for collection and recycling end-of-life PV modules http://www.pvcycle.org/
We also recommend to choose manufacturers with strong market position, appropriate tiering http://about.bnef.com and suitable bankability.
If you demand any other brand, please do not hesitate to contact us.