Start with the fence itself
Before attaching anything electronic, look at the fence. Devices need something solid to attach to, and a fence that is leaning, rotting or loose will make sensors misbehave and mounts fail. If the fence needs repair, do that first; the notes on fence restoration and storm damage fence checks are good starting points. Also confirm the fence is yours. A fence on a shared boundary or one belonging to a neighbor should not carry your devices without agreement, and the rules in the article on shared boundary fence arrangements may apply.
Check local regulations and HOA approval requirements as well. Some places limit fence-mounted lighting, restrict where cameras can point, or require approval for exterior changes.
Connected fencing: the main considerations
Connected fencing means ordinary fencing with sensors, lights or cameras that report over a network. The four practical issues are signal, power, weather and upkeep.
Wi-Fi range
A fence runs along the edge of the property, which is often the farthest point from the router. A few general points apply:
- Walls, metal, dense planting and distance all reduce signal.
- Test at the exact spot, with a phone, before drilling. A single bar of signal that comes and goes will lead to missed events.
- Options for improving it include a mesh node or outdoor access point, repositioning the router, or using devices that connect through a hub with a stronger low-power wireless link.
- A wired connection, such as PoE for cameras, avoids signal issues for that device.
Power
Three choices are common:
- Battery. Simple to place, but batteries need replacing or recharging, and cold weather usually shortens their life.
- Solar. Convenient for lights and some sensors, but it depends on exposure. A fence shaded by trees or a building may not collect enough sun, especially in winter. Panels also need occasional cleaning.
- Low-voltage or mains wiring. The most dependable, but it requires running cable, and mains work is best left to a licensed electrician. Before digging to bury cable, arrange for utility locating.
Think about what happens in an outage. The article on fence lighting power goes into this for lights specifically.
Weather
Fences are fully exposed. Rain, sun, frost, wind and salt air all affect electronics.
- Look at the ingress ratings, as explained in the article on IP weather ratings.
- Use devices designed for outdoor use, and mount them so that cables hang in a drip loop and water cannot run into connectors.
- Wind makes fence panels move, which can cause false vibration or motion alerts. See the discussion of wind load for how fences behave in strong wind.
- In cold climates, ground movement can shift posts, which changes where a sensor points. The article on frost heave explains the problem.
- Sunlight can fade plastics and overheat devices, especially on dark-colored fences.
Maintenance
Add devices to your regular fence maintenance routine. Several times a year, walk the line and:
- check that each device is firmly mounted and has not been knocked out of position;
- test sensors and lights;
- replace or recharge batteries before they fail;
- clean solar panels and camera lenses;
- trim plants that touch the fence or block a sensor’s view;
- confirm firmware updates have been applied.
Material notes
Mounting differs by material. Wood takes screws readily but can swell, shrink and rot. Vinyl can be brittle in cold and may not hold screws well without backing. Metal offers a solid mount but can conduct vibration and may need non-corrosive hardware; see the notes on corrosion-resistant hardware. Chain link and wire mesh need clamps or brackets designed for them. Whatever the material, avoid compromising the structure with large holes or cutting through key rails.
Keep the scope modest
It is easy to light and sensor an entire fence line, but doing so often produces more alerts and more upkeep than benefits. Concentrate on gates, corners and the places a person is most likely to approach or cross. Lights that come on only when triggered are less annoying to neighbors than lights that are on all night, and cameras should be aimed at your own property.
Security of the system
Each networked device is part of your home network. Use a separate network for smart devices if your router can, strong unique passwords, and updates. The basics are in the article on camera account security.
No combination of fence sensors can guarantee that crime will be prevented. They are most useful for telling you what has happened, and for making a boundary a little more noticeable to anyone approaching it.