Choosing the wrong energiser is one of the most common and costly mistakes in rural fencing. Too small and your fence won't hold stock. Too large and you've overspent for no benefit. Here's how to get it right.
How to Size an Energiser
Energiser output is measured in joules (stored energy) and kilometres of wire capacity. The key variables are:
- Total wire length — measure all runs including returns
- Vegetation contact — heavy grass and scrub drain output significantly
- Number of wires — more wires = more surface area = more load
- Stock type — pigs and horses require higher voltage than cattle
As a rule of thumb: size up. A fence running at 4,000–5,000 volts under load is effective. Under 2,000 volts and most stock will push through.
Mains vs Solar vs Battery
Mains-powered energisers provide the most consistent output and are ideal for permanent fencing close to power. Gallagher M series and Nemtek mains units are reliable workhorses.
Solar energisers are the go-to for remote locations. Gallagher S series and Thunderbird solar units combine panel and battery in one unit. In Queensland, a 5W panel can run a mid-range unit year-round.
Battery-only units suit temporary or portable fencing. Gallagher B series run from a 12V battery and are easily moved between paddocks.
Top Brands at TGRM
- Gallagher — industry standard, extensive range from hobby to commercial
- Thunderbird — excellent value solar units, strong in Queensland conditions
- Nemtek — premium commercial-grade for high-security and intensive grazing
Shop Electric Fencing at TGRM
TGRM stocks the full Gallagher, Thunderbird and Nemtek range. Browse our Electric Fencing collection or visit us in Gympie. Our team can help you spec the right energiser for your property size, stock type and location. Delivered Australia-wide.
Related reading: Gallagher vs Thunderbird — Which is Right For You? | How to Build an Electric Fence