Portable peak power and I-V-curve measurement device for photovoltaic modules und small strings up to 250V and 40Adc

The devices series PVPM provide the measurement of the I-V-curve of photovoltaic modules as well as strings. By a patented procedure the device can measure and calculate the peak power Ppk, the Rs and Rp from a single I-V-curve directly at the place of assembly of the PV system. Calculation results and the diagram can be displayed on the internal graphical display.

The input of detailed module parameters is not required in common (but possible).

The PVPM2540C is a mobile measuring device with integrated battery supply and external battery charger in a durable aluminium housing. The device has its own industrial miniature PC and a high-contrast TFT Touch Display and thus its function is independent of other devices. However if desired a PC can be attached for data transfer and further analysis of the measured values over a standard USB interface.

The PVPM is operated comfortably over an on-screen menu. The functions are defined self-describing and the user is always led by the program. So no long training activities for the operating staff are necessary.

(Changes reserved)

Build in a stable aluminium case with carrying handle and tough front panel.

Measuring Unit:

  • Miniature industrial PC 32Bit, real time clock, no mechanical moving parts
  • Sampling rate max. 100kHz
  • Resolution 0.01V - 0.25V, 0.005A – 0.01A (depending on sel. range)
  • Accuracy of the a/d converter 0.08% of FSR±1 LSB
  • Accuracy Peak power measurement: ±5%
  • Reproducement: ±2-3%
  • Duration of single measurement: 20ms up to 2 seconds, avoiding the influence of capacitive properties of the module under test
  • Non volatile data storage for several thousand measurements
  • Irradiance reference sensor (Phox) with integrated Pt100 or Pt1000 temperature sensor measures irradiance and cell temperature
  • Other commercially available sensors can be connected using a reliable cable connection
  • 4-wire-cabling between PVPM and generator under test avoids mis-measurement of voltage
  • Additional measurement of the back surface temperature of the module under test (second input for Pt100 RTD available)
  • Continuous long-term measurements of I-V-curves in selectable time intervals

The device may only be attached to a limited source of direct current (photovoltaic generator) with at most 40A

Measuring ranges of the PVPM2540C  (changes possible):

Voltage: 25V / 50V / 100V / 250V
Current: 2A / 5A / 10A / 40A
Temperature: -40°C - +100°C with Pt1000
Irradiance: 0 - 1300W/m2 (Standard sensor)
  • Ranges for current and voltage can be combined in any order
  • An optimal range is selected by the device automatically.


  • LC display, monochrome, LED backlight, resolution 240x128 Pixel, sunlight capable


  • Menu driven with keys on the front panel
  • Operation and evaluation alternatively by Windows software, connected via USB 2.0 standard cable

Power Supply:

  • Li-Ion-battery 99.6Wh (continous operation ~ 8 hours)
  • External power supply wide range input (90-263Vac, 47-63Hz, 40W), UL approved
  • Integrated battery charger with overload protection for accumulator
  • Display of battery state with LEDs at the front panel


  • Width: 48 cm, Height: 16 cm, Depth: 35 cm, Weight: ca. 8,0kg

Operating Conditions:



Rel. Humidity


0°C - 40°C

10% - 90% (n. c.)


-10°C - 85°C

5% - 95%

  • Measuring instrument in sturdy metal housing with adjustable carrying handle
  • TFT colour display with touchpanel, LED backlight, sunlight capable
  • Battery supply, inserted power pack to the charge of the accus and to the line operation
  • 4-wire-lead (10 meters)
  • Calibrated radiation reference sensor (Phox), integrated temperature sensor Pt100/Pt1000
  • USB cable for linking an evaluation PC
  • Control and evaluation software for Windows 2000, XP, Vista, 7, 8, 8.1, 10
  • Users Manual
  • External Santon Security Switch 1000V / 50A
  • Case for wires and sensor

Optionally available

  • Additional surface sensor Pt100 for module temperature
  • Software for MS Windows for the automatic generation of test reports
  • Test lead with 15 or 25 m (other lengths on request)
  • Housing optionally as 19" rack mounting cover
  • Rough transport case (trolley) PELI 1650

additional accessories