UI-Kennlinienmeßgerät für Solarmodule und -generatoren

pvengineering

UI-Kennlinienmeßgerät für Solarmodule und -generatoren

PVPM Users Manual Page 23

Parameters affecting the Accuracy of the Measurement

6 Parameters affecting the Accuracy of the

Measurement

Be sure, that there is no shadow (even not the smallest shadow!)

affecting the module to be measured. Even the shadow of grass

may cause an error! This is also true for the reference sensor.

The higher the irradiance to the module, the more exact will be

the result. The irradiance measured by the combined sensor

should be higher than 500 W/m2 if possible.

The combined Phox/Pt1000 sensor measures the cell

temperature at the back of the reference cell. The PVPM expects

this temperature to be nearly the same as that of the measured

module. This will be true with sufficient precision if the reference

cell and the PV module were exposed to the sunlight for same

period of time (at least 5 minutes).

The alignment of the module re. the sun is not relevant. Very

important is a sufficient irradiance to the module and precise

alignment of the reference cell towards the module. Often the

easiest way is to clip the combined sensor directly to the side or

top of the measured module. However the sensor may also be

installed in some distance to the module if you can grant the

correct alignment.

Pay attention to the cooling openings of the reference sensor,

these must not be closed or covered. This would cause an error

in the temperature measurement of the reference cell and affect

the quality peak power measurement.

Caution: even a few degrees deviation in the temperature

of the reference cell towards the module temperature can

cause a significant error in peak power measurement.

Before a you make a measurement be sure, that the

reference sensor and the module were exposed to the

same ambient conditions for a sufficient period of time!

PV-Engineering GmbH

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