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Metrel MI 3109 - Eurotest PV Lite Manual

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MI 3109 EurotestPV Lite Measurements
49
Figure 5.37: Example of Uoc / Isc measurement results
Displayed results for Uoc / Isc measurement:
MEAS column
Uoc .......... measured open voltage of the panel
Isc............ measured short circuit current of the panel
STC column
Uoc .......... calculated open voltage at STC
Isc............ calculated short circuit current at STC
U:............. actual voltage on test inputs
Notes:
Before starting the PV measurements settings of PV module type and PV test
parameters should be checked.
For calculation of STC results correct PV module type, PV test parameters, Irr
and T (ambient or cell) values must be measured or be entered manually before
the test. The Irr and T results in ENV. menu are considered. Refer to Appendix E
for further information.
The Irr and T measurements should be carried out immediately before the Uoc /
Isc test. Environmental conditions must be stable during the tests.
For best results PV remote unit A 1378 should be used.
5.7 I / V curve measurement
The I / V curve measurement is used to check correct operation of the PV panels.
Different problems on PV panels (failure of a part of the PV panel / string, dirt, shadow
etc.) can be found.
Figure 5.38: I / V curve starting screens
The data to be measured is divided into three screens. See chapter 4.2 Function
selection for instructions on key functionality.
Settings parameters for I / V curve measurement
1/3 Number of screen.
STC Results (STC, measured, both) to be displayed.
… 49 …


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