PVCHECKs-PRO
EN - 37
6.7. IVCK - TEST ON PV MODULES AND STRINGS
6.7.1. Foreword
This function carries out a series of tests on a PV module/string, measuring in a sequence:
Open-circuit voltage Voc of the PV string/module being tested, measured in OPC
condition (OPerative Condition), i.e. in the real conditions in which the installation is,
with or without irradiance and temperature measurement.
Open-circuit voltage Isc of the PV string/module being tested, in compliance with
standard IEC/EN62446, measured in OPC condition (OPerative Condition), i.e. in the
real conditions in which the installation is, with or without irradiance and temperature
measurement.
Insulation resistance in DUAL mode, with measurement of values R(+), R(-) and Rp.
Continuity of protective conductors with 200mA
When measuring Voc and Isc WITHOUT measuring irradiance and temperature, the
instrument only displays OPC values, compares them to average values (rolling average
of the last 10 measurements) and displays the result for a comparison with average values.
When measuring Voc and Isc ALSO measuring irradiance and temperature, the
instrument automatically “converts” the data in OPC conditions to STC conditions
(Standard Test Condition – Irradiance = 1000W/m
2
, Module temperature = 25°C, spectrum
distribution AM=1.5) for a comparison to the characteristics declared by the module’s
manufacturer. In these conditions, the use of the remote unit SOLAR03, to which
irradiance and temperature test leads are connected, becomes necessary.
Irradiance and temperature measurements of modules are carried out through one or
more reference cells HT305 (in case of Bifacial modules) and with temperature probe
PT305, connected to the remote unit SOLAR03, which communicates data in real time to
the instrument via Bluetooth connection. In case the connection between instrument and
remote unit becomes difficult (too high distance or transmission through walls/obstacles), it
is possible to carry out measurements converted to STC conditions by recording the
irradiance/temperature values from unit SOLAR03.
The recommended minimum irradiance threshold is 700W/m
2
the instrument carries out
all tests included in I-V test, manages all conditions and error messages of I-V test (wrong
numb. of mod., temp. out of range, cell presence, min. irr., etc.) and calculates the STC
values of Voc and Isc. This mode is recommended whenever accurate tests are to be
carried out on modules/strings being examined.
In general, the result page will include:
Description of the module used
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 in the 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 to
calculate an average.
The values of Voc and Isc measured under OPC as well as any partial result (only
available if STC values are not available) obtained by comparison with average values.
The values of Voc and Isc calculated under STC (if available) and any partial result
obtained by comparing the values calculated under STC with the nominal ones
(inserted in DB modules
The overall test outcome (OK(NO). The overall test outcome will be calculated basing
on the partial outcomes in STC (if available) or basing on the partial outcomes in OPC
(if STC values are not available).
The instrument will not display any overall outcome if no partial outcome is available.
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