Solar module measurements ET 250

Solar module measurements

Type: ET 250
Name: Solar module measurements


Photovoltaic solar modules convert sunlight directly into electrical current and are therefore an ideal component for renewable energy supply. Typical solar modules from the field of photovoltaics are made of several silicon solar cells connected in series.

The ET 250 trainer contains two such solar modules. The inclination of the modules can be adjusted. Cables can be used to connect the two modules in series or in parallel. A slide resistor simulates varying loads. Thus the slide resistor makes it possible to record current-voltage curves.

The separate measuring amplifier provides displays for all relevant variables. Two power resistors in the measuring amplifier are used to expand the measuring range for measurements at low illuminance. Sensors on the solar module detect illuminance and temperature.

In order to ensure there is sufficient illuminance, the trainer should be operated with sunlight or the optionally available artificial light source HL 313.01.

ET 250 can be expanded easily by using ET 250.01 Photovoltaic in grid-connected operation and ET 250.02 Stand alone operation of photovoltaic modules. The trainer ET 255 Using photovoltaics: grid connected or stand-alone can be used as an alternative to ET 250.01 and ET 250.02 and provides significantly extended experimental possibilities.

Technical details

  • trainer for solar module measurements
  • 2 pivoting solar modules on mobile frames
  • series and parallel connection options
  • slide resistor as variable load
  • 2 power resistors for expanding the measuring range
  • measuring amplifier with digital displays for current, voltage, illuminance and module temperature
  • reference cell as illuminance sensor
  • Technical data

    Module design

    • number of cells: 36
    • cell material: monocrystalline silicon
    • module area: 0,64m2

    Typical module parameters under STC
    (Standard Test Conditions)

    • max. output: 85W
    • short-circuit current: approx. 5,3A
    • open-circuit voltage: approx. 22V

    Slide resistor: 0…10Ω
    Two power resistors: 22Ω/50W

    Measuring ranges
    • temperature: 0…100°C
    • voltage: 0…200V
    • current: 0…20A
    • illuminance: 0…3kW/m2
    • inclination: 0…90°

    230V, 50Hz, 1 phase
    230V, 60Hz, 1 phase
    120V, 60Hz, 1 phase
    UL/CSA optional

    Dimensions and weight

    LxWxH: 1400x800x1490mm
    Weight: approx. 93kg