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The energiser's electronic circuitry takes electrical energy from the power source [mains or battery] and accumulates it in the storage capacitors. This energy is the stored energy within the energizer but not necessarily available to the fence and is measured in joules. 1 joule almost equates to the amount of energy required to lift 2 kilograms against gravity to a height of 1 meter. As the amount of energy actually transmitted to the fence is affected by the internal electronics, it is not advisable to use this figure as a comparison. The closer this figure relates to the Output figure - the more advanced the electronics.
Triggered by electronic circuitry, the stored energy is discharged through an output transformer to the energiser's fence terminals. Some energy is lost in this process so Output energy is always lower than the Stored Energy. This output energy is the effective energy applied to the fence and is measured in joules. THIS is the figure to use when comparing energizers.
Energy available under a load of 500?. This is the equivalent of a mammal touching a fence. The closer this is to the Output rating, the better the circuitry will handle a load on the fence and is an ideal way to compare between different manufacturers.
The Maximum length is a theoretical figure if your fence was in perfect order and the best conductors have been used (0.05 Ohms/m). It is advisable you use a figure about 60% of that stated. If there will be considerable challenge from vegetation, opt for the hotShock or Farmer range as they are capable of handling greater pressure. Regrettably many manufacturers do substantially over-state the capacity of their energisers.
If your pasture is near an electrical outlet then using a mains energizer is a shoo-in. They are stronger, cheaper to run and don't need batteries. All mains units are supplied with UK specification plugs and electrics. They do need Long earth stakes, a connection cable to attach both the earth stakes and to the fence. This is not supplied as the distances vary and High Voltage Insulated Cable is recommended.
Where a mains energizer is located within a fire-risk building it is advisable to include a Lightning Arrestor between the fence and the building.
9 volt units are very portable, light-weight, easy to use and handy. Technological advances in batteries give them excellent life and they are housed within the energizer resulting in a single unit. These are ideal for most situations around equestrian yards.
More powerful than 9 volt. Generally used with re-chargeable batteries, an alternative is needed whilst charging takes place. A car battery is designed to have a rapid drawdown of power with constant re-charging so does not last long, so a 60aH leisure battery is better. Due to delivery legislation, wet 12v batteries are not available. Long earth stakes need to be purchased
Remember that animals will learn not to touch a wire with 6,000 volts running through it.