Note: EkoDeluxe now specialises in handheld test and measuring instruments. Looking for tools related to this topic? See our Moisture Meters.
Short answer: choose an energiser by the length and type of fence, the animals you keep and the vegetation load, then by power source (mains, battery or solar) and output energy; choose trail or time-lapse cameras by trigger speed, night vision, battery life and weather rating.
How does an electric fence work?
An energiser releases short, high-voltage pulses into the fence wire, typically about once a second. When an animal touches the wire, the pulse passes through the animal into the ground and back to the energiser's earth system, delivering a short, sharp shock that teaches the animal to respect the fence. Because the pulse is brief, it deters without causing lasting harm when equipment is designed and used correctly.
The circuit depends on good earthing. Weak earthing is the most common reason a fence feels weak.
Trail cameras use a passive infrared (PIR) sensor to detect warm moving bodies and trigger photos or video, with infrared LEDs for night images. Time-lapse cameras capture images at fixed intervals over days or months.
Which type of energiser do I need?
| Energiser type | Power | Best for | Limitation |
|---|---|---|---|
| Mains | 230 V supply | Permanent fences near buildings | Needs mains access |
| 12 V battery | Leisure or car battery | Temporary and strip grazing | Battery recharging |
| Solar | Panel and battery | Remote fields | Winter output can drop |
| Dry battery | Disposable cells | Small paddocks, garden pest control | Running cost |
| Dual-power | Mains or battery | Flexible use | Higher cost |
What specifications matter?
Stored and output energy (joules). Higher output energy drives longer fences and copes better with vegetation touching the wire. Choose output energy, not just stored energy.
Rated fence length. Manufacturer distance ratings assume ideal conditions; real fences with multiple wires and vegetation need more power.
Animal type. Sheep with wool and wildlife such as deer need stronger pulses than cattle or horses.
Earth system. Follow the manufacturer's recommendation for earth stakes, especially in dry soil.
Fence tester. A digital tester shows voltage along the fence and helps locate faults.
Camera trigger and detection range. Fast trigger speed captures moving animals. Night range depends on the infrared illuminator.
Weather rating. Outdoor devices should carry a suitable IP rating under IEC 60529.
How are they used in the UK?
Electric fencing is widely used in UK livestock farming, equestrian paddocks, strip grazing, and protecting crops and poultry from foxes. HSE's agriculture pages cover farm safety more broadly; fences along public rights of way should carry warning signs and be positioned so the public are not put at risk. Mains energisers sold in Great Britain should comply with the Electrical Equipment (Safety) Regulations 2016.
Trail cameras help monitor livestock, wildlife, gateways and remote buildings. Time-lapse cameras record construction progress and crop growth. If a camera captures images beyond your own property, the ICO's guidance on domestic CCTV explains data protection responsibilities.
What mistakes should I avoid?
- Too few earth stakes, causing weak shocks.
- Overgrown vegetation draining power.
- Mixing wire metals, which corrodes joints.
- No warning signs where people walk.
- Choosing by stored joules rather than output.
- Pointing cameras at neighbours' property or public paths without considering privacy.
How do I install and check an electric fence?
Position the energiser where it is protected from the weather and livestock, or choose a unit designed for outdoor mounting. Install the earth system before connecting the fence, using galvanised earth stakes driven deep into soil that stays damp, and space them as the manufacturer recommends. Use insulated lead-out cable from the energiser to the fence and good-quality insulators on every post so the pulse is not lost to wood or metal.
Once running, check the voltage at the far end of the fence with a fence tester and record the value. A sharp fall compared with your usual reading points to a fault, which you can trace by testing at intervals along the line. Trim grass and weeds under the bottom wire, especially in spring growth, and inspect joints for corrosion. Repair broken wire with proper joint connectors rather than knots, which add resistance and weaken the pulse.
For cameras, mount them at a height and angle suited to the animals you want to record, avoid facing them directly into the sun, and clear vegetation that can trigger false images in wind. Use the battery type the maker recommends for cold weather and check memory cards regularly.
Frequently asked questions
How many joules do I need?
It depends on fence length, number of wires, animals and vegetation. Use the manufacturer's sizing guide and allow headroom.
Why is my electric fence weak?
Common causes are poor earthing, vegetation contact, broken insulators and corroded connections. Test along the fence to locate the fault.
Can I use a solar energiser in winter?
Yes, but short days reduce charging. Size the panel and battery for winter.
Do trail cameras work at night?
Most use infrared LEDs for night images, typically in black and white.
Do I need permission for a trail camera?
On your own land, generally no, but if it captures people beyond your property, data protection considerations apply.
What should I check before ordering?
Before you order any energiser or camera, write down the measurements or tasks it must handle, the range and accuracy you need, where it will be used and who will use it. Compare those notes with each product's specification sheet rather than its headline features, and keep the manual and any certificates with the instrument once it arrives.
Shop farm equipment
See electric fence energisers, fence testers, trail cameras and time-lapse cameras in our Farm & Livestock collection.
Sources
Cover photo: Kreuzschnabel, CC BY 3.0 via Wikimedia Commons
Photo in article: Kleuske, CC BY-SA 3.0 via Wikimedia Commons
