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Products  |  Thermal Engineering and HVAC  |  Renewable Energies  |  ET 250.01
ET 250.01 Photovoltaic in Grid-connected Operation Show data sheet (pdf file) Print page
ET 250.01 - A product from the GUNT 2E range
Technical Description

  Feeding electricity from photovoltaic solar modules into the mains grid requires several special system components. These components enable conversion and capture of the solar electricity and ensure  system safety.
  The ET 250.01 unit contains these components and is conceptualized as an extension for the ET 250 trainer.
  The photovoltaic DC current from ET 250 is fed to the input of ET 250.01A via a connection cable. Inside ET 250.01 the DC current passes safety devices and enters the inverter. The inverter transforms the DC  into  AC current. The inverter also  optimizes voltage and current to ensure that the photovoltaivc modules produce maximum possible power.
  The inverter output provides an AC voltage with appropriate level and frequency to enable feeding into the mains grid. The amount of fed in electricity is captured by a modern two way electricity meter.   

  Comparing electrical power of the DC input and the AC output enables determination of the inverter efficiency. The dependence of the inverter efficiency on the total electrical power  can be measured in further experiments.
  The well-structured instructional material sets out the basic principles and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments
- familiarisation with components from grid
  connected use of photovoltaic power
- functioning of a DC switch-disconnector and
  over voltage protection
- functioning of a grid connected inverter with
  maximum power point tracking
- dependence of the inverter efficiency on the
- function of modern energy meters


* unit with practical components for grid connected 
  usage of solar electricity1
* inverter providing grid control and maximum power
   point tracking1
* modern twoway energy meter for capture of energy
   transferred to and from the mains grid

Available accessories
ET 250 -- Solar Module Measurements

[1] extension for ET 250 Solar Module Measurements
[2] electrical Components für grid connected usage of photovoltaics
[3] combiner box with DC switch-disconnector and over voltage protection
[4] inverter for grid operation with maximum power point tracker
[5] two way energy meter connecting to the mains grid
[6] socket with energy meter for own consumption


Technical Data

DC switch-disconnector
-max. current: 30A
-rated voltage: 1000V
Over voltage protection
- rated impulse current 20kA
Inverter for mains grid operation
- rated input power: 150W
- max output power: 125W
- max. efficiency: 89%
Two way energy meter
- rated frequency: 50Hz
- rated voltage: 230V


Dimensions and Weight

LxWxH: 600 x 200 x 800mm
Weight: ca. 30kg

Required for Operation
230V, 50Hz, 1 Phase
Scope of Delivery

1 training unit

1 set of instruction material

Order Details
061.25001  ET 250.01 Photovoltaic in 
                                         Grid-connected Operation
© 2005 G.U.N.T. Gerätebau GmbH