Solar rooftop PV systems: Recommendations for the equipment selection

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Recommendations for the equipment selection:

  1. PV modules should be listed to IEC certified and warranted for a minimum of 10 years (20-25 year warranties are available)
  2. Inverters should be IEC/UL certified and warranted for a minimum of 5 years.
  3. All exposed cables or conduits should be sunlight resistant.
  4. All required overcurrent protection should be included in the system and should be accessible for maintenance
  5. All electrical terminations should be fully tightened, secured, and strain relieved as appropriate.
  6. All mounting equipment should be installed according to manufacturers’ specifications
  7. All roof penetrations should be sealed with an acceptable sealing method that does not adversely impact  the roof warranty
  8. Integral roofing products should be properly rated (e.g., class A roofing materials)
  9. All cables, conduit, exposed conductors and electrical boxes should be secured and supported according to
    code requirements.
  10. PV Array should be free of shade between 9:00 a.m. and 4:00 p.m. This requirement includes even small  obstructions such as vent pipes and
    chimneys. A small amount of shade can have a disproportionately high impact on system performance

    Further reading:PV Installation guide-www.energy.ca.gov

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