Site visit as discussed

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Mismatch,Shade,tools recommended during energy audits- PV systems

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Site visit as discussed

  1. 1. InspectionWhy including measurements?Visual inspections is not enough!Andreas Iliou - shading and measurements analysis
  2. 2. 1 Module Circuit Design2 Mismatch Effects3 Hot-Spot Heating4 Bypass diode, temperature
  3. 3. 01 Module Circuit Design 19 modules per string
  4. 4.  Module Circuit Design – Shading 4Some strings are shaded , flowers / Pylones
  5. 5.  Module Circuit Design – Shading 5Some strings are shaded , flowers / Pylones
  6. 6.  Module Circuit Design – Shading 6Some strings are shaded , flowers / Pylones
  7. 7. Modules shaded via transmissionlines 7PV Plant with similar shadings from a Transmission line
  8. 8.  Module Circuit Design -Shading 8Modules performance less in substrings shaded during the whole dayCould be regrouped easily as place is available shade shading Soft shade
  9. 9.  Module Circuit Design -Shading 9 shaded Rows shaded„Noise “measured on site during Shading e.g M9 O1 U3.2 G8 2,38 Ohm / 245 mA AC leakage current !!!
  10. 10. Module Circuit Installation 10 1 module was dismantled from the wind, therefore shadinganother 5 modules in different strings – future hotspot possible !!
  11. 11. Module Circuit Installation 11Mountain/ Valley installation so different values as module strings have different angles towards the sun
  12. 12. 02 Mismatch Effects
  13. 13.  Mismatch Effects 13 M9.O1 U3.2 C36 –G8 6,8 A 13,3 mA 7,4 A 14,7mA 6,5 A 15,9 mA 7,6 A 14,8mA 7,1 A 13,6mA 7,0 A 13,5 mA AC leakage current M9.O1 U3.2 –G8 2,38 Ohm / 245 mA at earthing point Different angles towards the sunSee more details sep. excel sheets
  14. 14.  Mismatch- what can be achieved with 14 measurements on site ? A 1 / G 10 Shaded array 0,3mA 7,2 7,7 7,6 6,9 7,1 7,6 A1 2Ohm / 44, 44, 44, 45, 44, 51, 3,8mA 7 3 2 4 2 6 G10 Here 51,6 A instead normally 44,7 – 45 ADue to contact problems increasing resistanceShaded row , or burned busbars will show deviations
  15. 15.  Mismatch Effects 15 Instead of normal values 44- 45 A this substring is over the limit After investigation it shows Burned current sensors We need to do Visual and Measurements on sites One alone is not enoughSee more details sep. excel sheets
  16. 16. 03 Hot-Spot Heating
  17. 17. Field Observation 17Siemens Les MeesThis results have been caused by the shading permanently of somesubstrings via transmission lines/ or –and PylonsHotspots are not accumulated right now- future ?! ( see page 7)
  18. 18. 04 Bypass Diodes
  19. 19.  Bypass Diodes 19Normal picture with bypassdiodes getting cooled
  20. 20.  Bypass Diodes 20Bypass diodes getting hotter, heating up -> shading

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