Quality criteria

The following quality criteria influence the performance and lifespan of your PV system:


  • IEC-certification to DIN EN 61215 for crytalline modules and DIN EN 6146 for thin-film modules
  • Protection class II - test (where necessary)
  • Module manufacturer’s performance guarantee (normally 90% of the nominal power output after 10 years, and 80% after 20-25 years)



  • Min. 5 years manufacturer’s guarantee (some providers offer up to 10 years)
  • Current EU conformity declaration
  • VDEW-permit
  • Clearance certificate from the relevant professional association


  • Corrosion resistance of all materials used for long durability


  • UV resistance of cables and connectors, secure cable routing


Whole system:  

  • Completion + commissioning certificate
  • Technical documentation