PV system components testing


PV module measurements

PV modules properties depend on cell type and ambient conditions. To compare modules of different types or from different producers the modules have to be tested under standardized conditions. Usually Standard test conditions (STC) and Nominal operating conditions (NOC) are used.

The electrical properties of PV modules are measured in a laboratory environment or under real test conditions, usually at one of the PV test sites LPVO-A and LPVO-B, which are located on the roof of the faculty building.


Standard test conditions

Nominal operating conditions

  • AM1.5 spectrum
  • irradiance: 1000 W/m2
  • module temperature: 25°C
  • irradiance: 800 W/m2
  • module temperature: NOCT
    • NOCT - Nominal operating cell temperature
    • 800 W/m2, Tair: 20 °C, wind: 1 m/s

The measurements in our laboratory follow IEC 61215 standards.

IEC 61215/61646 test currently covered in our laboratory:

10.1 Visual inspection

10.2 Maximum power determination

10.3 Insulation test

10.4 Measurement of temperature coefficients

10.5 Measurement of nominal operating cell temperature (NOCT)

10.6 Performance at STC and NOCT

10.7 Performance at low irradiance

10.8 Outdoor exposure test

10.10 UV preconditioning test

10.11 Thermal cycling test

10.12 Humidity-freeze test

10.13 Damp-heat test

10.15 Wet leakage current test

10.18 Bypass diode thermal test

Furthermore we offer measurements of conversion efficiency distribution with novel method of electroluminescence. This procedure reveals the majority of hidden defects present in the PV modules, which can have effect on long term stability and energy yield of a PV system.


PV Inverter testing

We test inverters and other PV systems with MPP tracking device according to EN50530 and EN61683 standards. PV array simulator Spitzenberger&Spies PVS7000 is used to simulate the characteristics of a PV array, up to 7 kW, and Zimmer LMG95 is used to measure grid voltage and current.

PV simulator characteristics:

  • Maximum output voltage: 950 V
  • Maximum output current: 22A
  • Maximum output power: 7 kW
  • Current limits for voltage ranges
    • 200V/22A
    • 400V/22A
    • 600V/14A
    • 800V/11A
    • 950V/9,25A

Available tests:

  • Static MPP efficiency
  • Dynamic MPP efficiency
  • Static power conversion efficiency
  • ETA efficiency calculation
  • Startup & Shutdown test
  • Higher harmonics measurements of grid current
  • Power factor measurements