MI 3108 EurotestPV
Solar measurements
– PV systems
82
I / V curve test procedure
Select
I / V
sub-function using the function selector keys and
/
keys.
Check or set PV module and PV testing parameters and limits (optional).
Connect
PV safety probe to the instrument.
Connect
environmental probes to the instrument (optional).
Connect
the item to be tested (see figure 6.25).
Press the
TEST
key to perform the measurement.
Store
the result by pressing the
MEM
key (optional).
Figure 6.26: Example of I / V curve results
Displayed results for I / V curve test:
Uoc .......... measured / STC open circuit voltage of the panel
Isc............ measured / STC short circuit current of the panel
Umpp ....... measured / STC voltage at maximal power point
Impp ........ measured / STC current at maximal power point
Pmpp ....... measured / STC maximal output power of the panel
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
Tcell 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 I / V
curve test. Environmental conditions must be stable during the tests.
For best results PV remote unit A 1378 should be used.
6.7 Measurement of cell temperature before test
The standard IEC 61829 recommends procedure for choosing and recording appropriate
conditions for measurement. One of the recommendations is that the temperature of the
PV array must be equilibrated before the test. In combination with the PV remote unit A
1378 the instrument enables to store the measured cell temperatures 0 min, 5 min, 10
min and 15 minutes before PV tests (I/ V curve measurement, Uoc/Isc test and PV panel
test).
The cell temperature should be measured with A1378 before the PV test. After
synchronization of results between the instrument and A1378 the instrument enables to
add temperature values before the test to stored I/ V curve, Uoc/Isc, and PV panel test
results.
