Patura 230v Mains Energisers. Mains energisers should be used when there is a 230 V power outlet close to the pastures. Lead outs to the fence up to 200 meters can be easily made. Therefore it is partially important that the unit is installed very carefully to guarantee a long-term and reliable operation of the energiser and fence. Stored energy 0.75 joules. The 230 V energiser for short fences with light vegetation for cattle and horses. Stored energy 1.5 joules. The 230 V energiser for electric fences for cattle, horses and sheep, also for longer fences with heavier vegetation; energiser monitoring indicator. Stored energy 5.8 joules.