HT instruments SOLAR I-V - Manual (Page 52)

I-V400 - SOLAR I-V
EN - 50
6.3. QUICK CHECK ON PV MODULES AND STRINGS (IVCK)
6.3.1. General
information
This function permits to carry out a quick Test of a panel/string just measuring open circuit
voltage and short circuit current in compliance with IEC/EN62446. Consequently both
irradiance and temperature module values can be measured (using corresponding probes).
Irradiation measurement can be executed only adopting one of the following modes:
 Irradiance sensor directly connected to I-V400 or SOLAR I-V
 Irradiance sensor connected to SOLAR-02 through RF to I-V400 or SOLAR I-V
Irradiance measurements are always effected in real time, it is impossible to start a “remote”
recording of irradiance values through SOLAR-02
If minimum IV irradiance threshold is set (see § 5.1.5):
 =
0
 the instrument does not control the presence of cell, irradiance changes, number of
modules and does not display error messages should it be impossible to calculate Voc
and Isc values transposed to Voc and Isc under STC. This mode is suitable to effect a
test session on a considerable number of strings as quickly as possible.
 > 0 (suggested > 700)  the instrument carries out all tests provided for I-V, manages all
conditions and error messages for I-V test (wrong num. Mod., Temp. out of range, cell
presence, Min Irr, etc..) and calculates values of Voc and Isc under STC. This mode is
recommended whenever thorough tests are to be effected on modules/strings under test.
In general the result page will include:
 Description of the module
 Irradiance and temperature values (if available)
 Average values of Voc and Isc calculated as average of the corresponding values under
OPC on the last 10 tests saved into memory. If the number of tests is < 10 the average is
calculated on the number of available tests. The first test will display dashes in the field
“average values” as there are no previous tests on which average can be calculated.
 The values of Voc and Isc measured under OPC as well as any partial outcome (the latter
available only if STC values are not available) obtained through comparison with average
values.
 The values of Voc and Isc calculated under STC (if available) and any partial outcome
obtained comparing the values calculated under STC with the nominal ones (inserted in
DB modules).
 The overall test outcome (OK(NO). The overall result will be calculated based on the
partial results.
 Based on partial outcome under STC (if these are available)
 Based on partial outcome under OPC (if STC values are not available)
The instrument will not display any overall outcome if no partial result is available.
In case of negative outcome it is advisable to effect measurement of I-V feature (see § 6.2) in
order to thoroughly analysis of the module/string under test.