UI-Kennlinienmeßgerät für Solarmodule und -generatoren

pvengineering

UI-Kennlinienmeßgerät für Solarmodule und -generatoren

PVPM Users Manual Page 55

Peak Power

these measurements under actual environmental conditions - the

measuring device converts them into STC. Thus after just one

characteristic line measurement the Peak Power Ppk, the

internal series resistance Rs and the parallel resistance Rp are

available as output. This output is, in comparison with the

specified value, an indication for different errors in the PV-

Generator, that way they simplify efficiency control and error

search.

13.13 Performance Ratio

The “Performance Ratio” means in, photovoltaic, the ratio of

available profit and specified value of a plant. The Performance

Ratio is the quotient of the yield of alternating current and

nominal yield of generator DC. It indicates what proportion of the

current produced by the generator is in real terms available. PVplants

of high capacity reach a Performance Ratio of more than

70%. The Performance Ratio is often denominated as quality

factor (Q). Solar modules on the basis of crystalline cells reach a

quality factor of 0,85 to 0,95, network coupled plants average out

at 70% to 75%.

13.14 Phox-sensor

The principle of the Phox (PHOtovoltaic LuX) -sensor is that the

current from the photovoltaic cell, which is almost linear to the

irradiation of the cell, is conducted through a so called shunt, a

particular resistor. The voltage which falls on part of the resistor

is on its turn linearly dependant from the irradiation and can be

easily measured with the measuring device. Disadvantage: every

sensor has got to be calibrated separately: the calibration value

is the voltage delivered by the sensor, when it is exposed to the

Standard-Test-Conditions (STC).

PV-Engineering GmbH

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