• Gossen Metrawatt
  • Gossen
  • Camille Bauer


Thank you

Item number: M360A

Peak power measuring instrument and characteristic curve tracer for photovoltaic systems

With auto-ranging up to 1000 V / 20 A / 20 kW

The PROFiTEST-PV permits measurement of characteristic IU curves, as well as individual photovoltaic modules and strings.

  • m360a-profitestpv_persp1_11067.jpg

Connect > Switch On > Start Measurement > Read Results > Done!

With the help of a patented process, the instrument is capable of ascertaining peak power, internal series resistance and internal parallel resistance directly on-site “with only one measurement and without entering module data”, which are then indicated at a highßresolution color graphic touch-screen which is suitable for use in sunlight.

Troubleshooting in PV systems, as well as documentation of system quality, are executed quickly and economically during initial start-up and subsequent testing without a long learning curve.

This simple yet decisive test assures safety for the customer and eliminates consequential costs for the installer.

Measured peak power can, for example, also be used in order to determine peak ratio. Beyond this, acquired characteristic curves make it possible to draw further conclusions regarding the electrical characteristics of the measured module or string. And thus, the tester is also suitable for use in research and development.

Product Highlights

  • CAT IV DAkkS calibration certificate
  • Bidirectional data exchange
  • Port for RFID readers, barcode scanners
  • Includes ETC software (Electrical Testing Center) incl. report templates acc. DIN VDE 0100-600, lightning protection system acc. DIN EN 62305, concrete-footing ground electrode acc. DIN 18014
  • Universal connector system
  • All measurements per VDE0100, part 600 and per GOST R (ГОСТ Р) 50571.16-99
  • Testing of residual current devices (RCCBs)
  • Loop and line impedance measurement
  • Voltage drop measurement
  • Measurement of insulation resistance using nominal voltage, with variable or rising test voltage
  • Low-resistance measurement
  • Earth resistance measurement
  • Standing-surface insulation measurement
  • DIN VDE 0100-600 / IEC 60364.6

Your advantages

PROFITEST – versatile and future-proof

  • Intuitive operation
  • Efficient work
  • Standards-compliant testing
  • Legally secure documentation

PROFITEST – saves time and money

  • As single test instrument for a broad range of applications
  • All measurements without any bothersome replugging of the measurement cables
  • Can be used all over the world thanks to language selection

PROFITEST – even 10 years down the road

  • Future-proof thanks to firmware updates
  • 10-year service guarantee
  • DAkkS certificate issued by own calibration laboratory
  • User support for questions about testing

PROFITEST – quick and easy report generation

  • Cascadable, future-proof software concept
  • Modern data management by means of customer and measurement data administration
  • Creation of system structures – from the system all the way down to the measuring points
  • Quick and easy generation of a legally secure report per ZVEH

PROFITEST – reliable measuring and testing

  • Easy operation with rotary switch
  • Predefined test sequences for structured testing
  • On-site help thanks to help function with wiring diagrams
  • Measuring category: 600 V CAT III / 300 V CAT IV
  • 4-wire measuring method – no compensation of the measurement cables is required


  • Broad-range measuring device for all alternating and 3-phase electrical systems with voltages from 65 to 500 V and frequencies of 15.4 to 420 Hz
  • Loop and line impedance measurement with DC bias magnetization
  • Measurement of insulation resistance using nominal voltage, with variable or rising test voltage
  • Low-resistance measurement with automatic polarity reversal
  • Testing of residual current devices and special RCCBs (selective S, SRCDs, PRCDs, Schukomat, Sidos, types G/R, AC, A, F, B, B+, EV and MI)
  • Testing of RCCBs in IT systems
  • Testing of insulation monitoring devices (IMDs)
  • Testing of residual current monitoring devices (RCMs)
  • Measurement of earth resistance (mains/battery operation)
  • Leakage current measurement with PRO-AB adapter
  • Standards-compliant testing of charging stations per IEC 61851 in combination with the PRO-TYP I/II test adapter
  • Testing of type S and K PRCDs with the PROFITEST PRCD
  • Residual voltage measurement per EN 60204
  • Automatic test sequence function USB/Bluetooth port
  • Push-print function – transmission of the measured value after measurement
  • Technical characteristics
    • Measurement of characteristic I-U curves at PV modules and strings up to 1000 V DC, 20 A DC and 20 kW
    • The acquired characteristic I-U curve is highly accurate thanks to steady measurement at the capacitive load.
    • Measurement of short-circuit current Isc, open circuit voltage Uoc, instantaneous peak power of a solar cell Pmax, series resistance Rs and internal parallel resistance Rp
    • Automatic conversion of momentary measured values to STC
    • Patented calculation process for evaluating PV generators without knowledge of the manufacturer’s specifications
    • Patented calculation process for determining the generator’s internal series resistance based solely on a single characteristic IU curve
    • Integrated customer database with bidirectional data exchange
    • Integrated module database with bidirectional data exchange • High level of intrinsic safety thanks to included load disconnector (1000 V / 32 A DC)
    • Power and temperature measurement via 4-wire cable for error-free results
    • Separate measurement of temperatures at the irradiation sensor and the back of the module (Pt100) for increased measuring accuracy
    • Continuous display of momentary irradiation and temperature provides information regarding measuring conditions
    • Easy touch-screen operation
    • Highly luminous, high resolution color TFT display with energy-saving LED illumination (suitable for use in sunlight!)
    • External power pack with broad-range input for charging the batteries, and for continuous operation of the measuring instrument
    • Software for graphic representation, evaluation and documentation with integrated database
    • Operation via a PC with direct import of measurements is also possible (e.g. for long-term measurements).
    • Open interfaces allow for operation of the instrument in special applications as well
  • Particularities

    The differences ...

    Why is measurement with capacitive load necessary?

    On the one hand, measurement of characteristic curves for PV generators (modules, strings, arrays) must not be conducted too quickly (high dV/dt), because the measured characteristic curve may be changed in the case of rapid measurement (< 20 ms) due to the capacitive/inductive attributes of the generator or the test setup, in which case not only the characteristics of the PV generator are reflected in the measurement results. On the other hand, measurement must not be too slow either (> 1 sec.), because the danger of fluctuating radiant exposure is otherwise significantly increased, which would influence measurement results. This affects module temperature as well, which reacts relatively sluggishly but nevertheless can change within a matter of seconds.

    Patented calculation process for determining the generator’s internal series resistance based solely on a single characteristic IU curve

    This resistance is the physical result of the material used to manufacture the module, as well as its layout and wiring connections, and normally has a constant value. For example, it amounts to roughly 1 Ω for crystalline modules and more than 2 Ω for thin-film modules. As of recently, measurement of internal series resistance can be performed with instruments from the Profitest PV product range. Only a single characteristic I-U curve has to be traced at the module for this purpose. On the basis of this characteristic curve, the instrument automatically calculates RS, as well as peak power PPK and parallel resistance RP.

    Theoretically anticipated internal series resistance RS can be calculated. For example, this is possible with the software if the following characteristic STC values are known for the module: Uoc, Isc, UMpp and IMpp.

    The calculated RS value can then be compared with the measured value, which is read out by a Profitest PV after curve tracing. If the measured value is too high, wiring must be inspected for interruptions, corrosion, connection errors and underdimensioning.


Download Center

In our Download Center you will find all documentations from the product area in English.

More Topics


If you have questions about the product, need technical information or the current delivery time? Our sales department will be happy to help you!

Sales Support

Telephone: 732-287-3680

Send message


Under myGMC you can register your product, and receive up-to-date information on firmware updates, standard changes and much more.