The robust portable battery operated MP-11 I-V Checker enables the operator to perform accurate I-V performance
measurements and inspection of PV modules or arrays on site. For direct control of the measurement functions
and analyzing measurement results, the Main Unit has a key-pad and Graphical LCD display. The MP-11 offers an
all in one measurement solution to make PV module testing very easy, hence all required accessories like the
radiation sensor, temperature sensors, cables and PC software for control and extended data analysis are
included.
The MP-11 I-V Checker is capable to measure I-V curves based on the parameters (Vpm, Ipm, Pmax, Voc, Isc, FF,
Tmod, ηeff) of any PV module types and arrays, also called strings. It is highly suitable during PV module
installation, for making routine checks for inspection of energy yield, tracing module performance and potential
defects and general maintenance checks. The MP-11 can be used for almost any Module type as long as the
output fits in the range (10 –1000V / 100mA - 30A / 10W - 18 kW).
*) See Applicable PV module/Array in 11. Specification
The MP-11 measuring principle is based on the capacitive electronic load method, which makes it a compact
measurement device with a wide measuring range (Voltage, Current and Power). With traditional I-V curve tracers,
sensors had to be at the place where the PV module is situated, which consequently requires long cables between
the PV module and I-V curve tracer. By using the remote Sensor unit installed near the PV module accurate
measurements can be performed and data can be stored on board. The MP-11 is unique due to the integrated
removable Sensor Unit. The Sensor Unit contains an integrated high precision pyranometer, which is based on a Si
Photodiode and data logger to store the measured data of the internal or external sensor and 2 temperature
sensors. It is used to measure the solar irradiance in simultaneously with the PV module, PV module back surface
temperature and ambient temperature. The input terminals for external sensors are available on the Sensor Unit to
connect any EKO pyranometer type, such as MS-802 (ISO Secondary standard), MS-402/MS-410 (ISO First
Class), MS-602 (ISO Second Class), ML-01 (Silicon type) or reference cell as sometimes required by directive or
spectral match with the modules installed. With the built in data logger, the measurement data can be recorded for
maximum of one day. After the test, the data can be easily transferred from the Sensor Unit to the Main Unit by
connecting it through the sensor unit cable.
The Main Unit is capable of measuring, displaying and analyzing data, all functions that can be accessed through
the front panel keypad. Up to 300 I-V curves can be stored on board, which is mostly sufficient for one day. On top
of that extensive data analysis and data storage, data format conversion to a (.CSV) file format can be done using
the PC with the MP-11 control software. The I-V curve measurement data displayed on the Main Unit are
automatically converted into STC values, known as Standard Test Conditions (STC) values complying to the IEC
60891 and JIS C8914/8919/8940 Standard. This way measurement values converted to STC values can be better
quantitatively compared when the data are obtained during different environmental or atmospheric conditions
(Global radiation, Temperature) or inter compared between different types of modules.
For the ease of use, most common physical constants like Alpha, Beta, Kappa and Rs are pre-set and can be
selected to make the STC conversion. For more specific module types those parameters and other module
settings can be customized and stored as a personal file.
