PV Installations & Errors

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Slide set from #SolarMOOC presentation "PV Installations & Errors" featuring Andreas Iliou of Suntech-Power Germany

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PV Installations & Errors

  1. 1. PV Installations & Errors Prevent Errors upfront Andreas Iliou / SuntechAll Rights Reserved
  2. 2. Photovoltaic Systems Energy Audits Protection Maximum Power Point Tracking (MPPT) Weak light – Shading Microcracks Production, during Transport and Installation Photovoltaic Systems Energy Audits Protection Backfeed Current Leakage CurrentAll Rights Reserved
  3. 3. 01 Photovoltaic Systems Energy Audits ProtectionAll Rights Reserved
  4. 4. Reason for less power output  Power Plant with less kWh/kWp compared with nearby installations  Planning layout / Optimization  Mismatch losses due to wrong inverter / module combination (high losses ) resize cable diameters  Strings not correctly installed,single modules not Connected polarity wise – connectors without contact  Mismatch losses can be changed regards inverter e.g Multistring inverter agains 1 Tracker  Shading not upfront recognised, restring or reinstallation of different invertertype Cleaning of inverters regularly (heat transfer /cooling!) to hot surface temperature at cooling and/or AC side testing procedureI-V curve testingAll Rights Reserved Source Iliou
  5. 5. Reason for less power output  Power Plant with less kWh/kWp compared with nearby installations  Planninglayout/Optimizing  Distance of inverters to close by  Inverter cools down from right to left therefore heating up uneccessarily second and third inverter  Losses due to planning and/ or installation mistakes accumulates up to 250 W losses  Systems runs without ( Datalogger ) no stringcontrol,  Inverter covered and overheats , built in a small room no cooling possible, cuts off frequently without problems Iso faults, shortcuts etc.All Rights Reserved Source Iliou
  6. 6. Reason for less power output Inverters must be installed according manual Source MastervoltAll Rights Reserved
  7. 7. Reason for less power output Alternative Solution: Board can be used to split incoming AirAll Rights Reserved Source Mastervolt
  8. 8. Reason for less power output Different topologies involvedAll Rights Reserved Source google
  9. 9. Reason for less power output Shaded or already to less modules plannedAll Rights Reserved Source Iliou
  10. 10. Reason for less power output Shaded or already to less modules plannedAll Rights Reserved Source Iliou
  11. 11. Optimising Power output Optimum East- / Westconfiguration: 2:1 = 2 Strings right and 1 String left 3:1 = 3 Strings right and 1 String leftAll Rights Reserved Source Iliou
  12. 12. Tests to determine less power output Shaded or already to less modules planned  Check of all AC outlets  Check of all earth wires  Polaritytest of each string  Testing of all Stringvoltages  Measurements of shortcut current  Isotest of all DC strings  Performance test and visual inspection of all componentsAll Rights Reserved Source Iliou
  13. 13. Tests to determine less power output Check poweroutput with the Voltage AC gridAll Rights Reserved Source Iliou
  14. 14. Testing procedure – less power output Shaded or already to less modules planned • Visual Inspection Check of all AC outlets • Isolationtest • Check of all deactivation figures • Cable size and resistance check • Values should be underneath <1 Ohm • Feed in AC checked with AC siteAll Rights Reserved Source Iliou
  15. 15. Testing procedure – less power output Shaded or already to less modules planned • Are modules covered with grease or dust -> please check • Contacts faulty , check each single string • Bushes or trees grown up Is it possible to increase or still decrease MPPT from the inverter or are to less modules connected when Shading occures with more than 1 single module Involved. Temperature zone concept been used Are more systems already been built in the neighbourhoodAll Rights Reserved Source Iliou
  16. 16. Testing procedure – less power output No power output during daytime Shaded or already to less modules planned Meter doesn t turn Still to dark outside, check later on again  Circuit breaker turned down ?  Switch defect ?  Lightning protection device faulty? ->current flowing  During winter everything worked fine , ½ year later extremely poor output achieved always during high peak and high temp->low output  Power failure Main Grid  Iso fault with no reason, check contacts involved  Single test of each string  Data locked at inverter -> please check  Failure in AC Supply , please check with earth loop testerAll Rights Reserved Source Iliou
  17. 17. Less power output due to stray currentsAll Rights Reserved Source Iliou
  18. 18. Less power output due to stray currentsAll Rights Reserved Source EP
  19. 19. Less power output cause is stray , and ground currents PE+Neutral bound together- lot s of stray currents ,more lossesAll Rights Reserved Source EP
  20. 20. Less power output cause is stray , and ground currents PE+Neutral seperate - NO currents ,less losses involvedAll Rights Reserved Source EP
  21. 21. Thank you 1 Andreas IliouAll Rights Reserved

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