Mains or Battery Energisers

Mains or Battery Electric Fence Energisers — Buying Guide

Why Choose a Dual-Power Energiser?

A mains/battery combination energiser offers the best of both worlds — the high output power of mains-connected operation when you have access to 240V power, and the freedom to relocate or operate from battery when mains power is unavailable. This flexibility makes dual-power energisers an excellent choice for properties where the fence line passes through both powered and unpowered areas, or where the primary fence location may change seasonally.

How Electric Fence Energisers Work

An electric fence energiser converts the power source (mains or battery) into brief, high-voltage pulses that are delivered to the fence line at approximately one-second intervals. When an animal contacts the fence and a circuit is completed to earth, the animal receives a short, sharp shock that is sufficient to deter it from the fence without causing lasting harm. The energiser output must be appropriate for the total length of fence being powered and the animals being contained or excluded.

Selecting the Right Output for Your Fence

• Joule rating — the stored energy output of the energiser; higher joules = more powerful punch for longer runs and more resistant animals
• Fence length — energisers are rated for maximum fence kilometres; do not exceed the rated fence length for adequate shock delivery
• Animals being controlled — small animals and sheep require less energy; cattle, pigs and large wildlife require higher output energisers
• Vegetation on fence — heavy grass and scrub in contact with fence wires drain energiser output significantly; allow for this when selecting energiser size

Battery Options

Most mains/battery energisers can operate from a 12V deep-cycle battery when mains power is unavailable. Battery life depends on the energiser output and the quality of the fence (poorly insulated fences drain batteries quickly). A 12V, 40Ah battery typically provides several days to weeks of operation depending on energiser size and fence condition.

Frequently Asked Questions

Can I switch between mains and battery power on the same energiser?
Yes — dual-power energisers are designed to switch between mains and battery operation. Check individual product instructions for the switchover procedure.

How often should I check my electric fence energiser?
Check voltage output and fence condition weekly during critical periods (livestock movement or predator pressure). An electric fence tester is an essential complementary tool.

What joule output do I need for cattle?
For cattle, a minimum of 2–3 joules is recommended for short fences with low vegetation, increasing to 5+ joules for longer runs or heavy vegetation contact.

Order Electric Fence Energisers Online — Australia-Wide Delivery

Order online for fast dispatch. Contact our team for help selecting the right energiser output for your fence length, animal type and power supply situation. We supply farmers and rural property owners across Australia.