ET 250 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.
- two solar modules on mobile frame
- two pivotable solar modules on mobile frame
- series and parallel connection
- adjustable electrical load
- measuring amplifier for current, voltage, illuminance and temperature
- suitable for sunlight and artificial light
- expandable with the experimental units ET 250.01 and ET 250.02 or with the trainer ET 255
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
- 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
- physical behaviour of solar modules under a variety of effects
- illuminance
- temperature
- shading
- familiarisation with key parameters
- short-circuit current
- open-circuit voltage
- current at maximum output
- voltage at maximum output
- relationship between module inclination, illuminance, short-circuit current and electrical output
- recording a module’s current-voltage curve
- determining the efficiency
- connection types for the modules
- series connection
- parallel connection
- how cells covered by shadow affect the current-voltage curves
