Peak power and characteristic curve measuring device for photovoltaic systems. With automatic measuring range switching up to 1500 V / 20 A / 30 kW The PROFiTEST-PV enables the measurement of the IU characteristic curve of both individual photovoltaic modules and strings. . CONNECT > SWITCH ON > START MEASUREMENT > READ > DONE! Using a patented process, the test device can determine the peak power, the series internal resistance and the parallel internal resistance directly at the installation site 'with just one measurement and without specifying the module data' and display it on the high-resolution touch color graphic display suitable for sunlight. Both troubleshooting in a PV system and documenting the system quality are carried out quickly and economically without a long training period during commissioning and also during subsequent checks. This simple and meaningful test ensures the safety of the customer and saves follow-up costs for the installer. The measured peak power can also be used, for example, to determine the performance ratio. The recorded characteristic curves also provide further information about the electrical properties of the module or string being measured. This makes the tester also suitable as an instrument in research and development. Measurement of the IU characteristic curve on PV modules and strings up to 1500 V DC, currents up to 20 A DC, power up to 30 kW High accuracy of the recorded IU characteristic curve through uniform measurement on a capacitive load. Measurement of the short-circuit current Isc, the open circuit voltage Uoc, the current peak power of a solar cell Pmax, the series resistance Rs, measurement of the parallel internal resistance Rp Automatic conversion of the current measured values to STC Patented calculation method for evaluating PV generators without knowledge of the manufacturer's data. Patented calculation method for determining the series internal resistance of the generator from just one measured IU characteristic curve. Integrated customer database with bidirectional data exchange Integrated module database with bidirectional data exchange High intrinsic safety thanks to the included 1500 V/ 20 A DC load break switch Power and temperature measurement via four-wire cable for error-free results Separate measurement of the temperatures of the irradiation sensor and the back of the module (Pt100) to increase measurement accuracy. Constant display of the current irradiation and temperatures to provide information about the measurement conditions. Simple operation via the screen's touch function. Bright, high-resolution TFT color display with energy-saving LED lighting. (Suitable for sunlight!) External power pack with wide-range input for charging the battery and for continuous operation. Software for graphical representation, evaluation and logging with integrated database - operation optionally via PC with direct transfer of results (e.g. for continuous measurements) possible.Open interfaces allow the device to be operated even in special applications. . The differences ... Why is a measurement with a capacitive load necessary? On the one hand, the characteristic curve measurement on PV generators (modules, strings, arrays) must not be too fast (high dV / dt), as with fast measurements (1 sec), otherwise the risk of fluctuations in the radiation during the measurement increases significantly, which would affect the measurement results. The module temperature is also affected by this, which reacts relatively slowly, but can change within seconds. Patented calculation method for determining the series internal resistance of the generator from just one measured IU characteristic curve. This resistance is physically derived from the module