What is impulse energy

When a new electric fence is to be purchased, the question arises as to the necessary strength of the device. The device manufacturers are confusing with all sorts of technical data, which are explained below.

Output voltage
Is the voltage that is measured at the output of the device (without the fence connection). This value has little informative value.

Load voltage at 500 ohms
Is the voltage measured at the output of the device under normal stress, e.g. contact with an animal or heavy vegetation. Today, a minimum voltage of over 2000 volts is required at every point on the fence. For animals with thick fur (e.g. sheep or horses with thick winter fur) a minimum voltage of up to 4000 volts is required so that the electric shock can penetrate the hair layer.

Charging energy
Is the performance of the plant. This size can be used to compare the performance of devices with one another. However, this value does not contain any information about the effectiveness of the fence!

Calculation for the necessary charging energy of a device depending on the device type, animal species, fence length and the fence material used:

Type of plantAnimal speciesFence lengthFence materialRows= Charging energy
Power supply unit 1Horses 0.9500 m = 0.5Straight wire 2.5 mm 1.01 conductor 1.25
Battery device 0.2Cows 1.01000 m = 1.0Straight wire 1.6 mm 1.52 conductors 1.0
Sheep 1.5Insert the actual length of the fence in kmPlastic strand 3.03 conductors
and more 2.0
Turbo strand 1.5
Broadband strand 3.0
Turbo broadband 1.5

Net system for horses, fence length 2000 meters with plastic braid, 3 rows of wire

1x 0.9x 2x 3x 2= 10.8 joules

Impulse energy
Is the maximum energy (in joules) of an impulse that a device emits on the fence. The higher this pulse energy, the easier it is to destroy vegetation and the safer the fence is. Basically, it is not the charging energy of the device that makes the "impact" of the electric fence, but its discharge or impulse energy. This is given in joules (J). We recommend (according to DLG) devices that achieve a pulse energy between one and a maximum of five f joules.

maximum fence length
The maximum fence length always indicates the simple length of a complete fence and not the total length of the individual electrical strips. If you divide the specified fence length by the number of electrical strips to be fed and take half of it (as a discount for vegetation), you arrive at realistic fence lengths for which a device is designed!

Values ‚Äč‚Äčthat should be adhered to for safety reasons according to VDI regulation 0131 / 4.1984 or DIN 51 131:

  • Voltage: 2,000 to 5,000 volts (maximum 10,000 volts)
  • Current strength: 100 to 300 mA (maximum up to 1 000 mA)
  • Impulse: 0.02 to 0.1 sec
  • Pause: 0.75 to 1.25 sec
  • Impulse energy: at least 0.5 joules to a maximum of 5 joules