DIY vs Buying Robot Mower

Robot Mowers  · 

What you are actually installing

A wire-guided mower needs three things put in place: a closed loop of insulated boundary cable around the mowing area, a charging dock sitting on the lawn and connected to that loop, and a low-voltage power supply plugged into an outdoor socket. The cable carries a signal, not mains power, which is why the outdoor work is safe to do yourself; the part that has to follow your local electrical rules is the outdoor socket and the residual-current protection feeding the adapter.

An RTK machine swaps the loop for a reference antenna and a mapped boundary, so the labour moves from stapling cable to siting hardware and walking the perimeter with the app. Either way, locate irrigation lines, lighting cable and drainage runs before you start. A spade or an edger through a sprinkler line costs more to put right than the entire install.

Staple spacing and corner geometry

Along open runs, pegs are typically pressed in every thirty to fifty centimetres; on curves and corners, halve that so the cable cannot bow out of the soil and get clipped. Corners are where most layouts go wrong. A hard right angle in the cable makes the mower slow, hesitate or cut a rounded arc inside the boundary, and the uncut wedge that leaves behind never goes away.

Round the wire through the corner, and keep the approach to any turn square for at least a machine length. Hold the loop at a consistent distance from walls, fences and beds, because the boundary offset setting decides how close the deck gets and an uneven loop makes that setting meaningless. Where the cable crosses a path, driveway or gateway, run it through a sleeve and leave slack at both ends. Leave a spare loop of a metre or two at each corner, which is the cable you will splice into later.

Islands, obstacles and the approach strip

Anything inside the lawn the mower must not touch — trees, posts, a sandpit edge, a pond bank — is handled with an island. The cable leaves the perimeter, loops around the obstacle, and returns beside the outbound run. Running the two wires together, twisted or within a couple of centimetres, cancels the signal between them, so the mower treats the obstacle as enclosed and drives straight across the approach strip.

Run those paired wires perpendicular to the mower’s usual direction so it crosses quickly rather than following them. Islands are the fiddliest part of a wire install and the usual reason a lawn still needs hand trimming: a badly placed island creates a pocket the mower cannot enter, and every island adds another place where the cable can be nicked. For a steep bank or a patch that stays soggy, islanding is often the only way to keep the mower off ground it would otherwise rut.

Siting the dock and getting power to it

The dock wants flat, firm ground, because a mower that rolls back off the contacts stops charging and strands itself in the middle of the lawn. It also wants a straight approach of a metre or two of open grass in front, a position on the perimeter rather than in the centre, and a guide wire that runs out into clear ground instead of through a pinch point. Avoid any spot where the mower has to reverse into a corner to park, and keep the dock out of the main line of foot traffic.

On the power side, the adapter needs a weatherproof socket with the protection your local code requires. The low-voltage lead from adapter to dock can often be extended, but there is a maximum length in the manual; check it before committing to a socket position. If the socket is far from the lawn, run the low-voltage lead inside conduit rather than leaving it lying on the surface for the edger to find.

Trenching versus laying wire on the surface

Surface laying is faster: press the cable into the soil with an edger or a turf knife, peg it, and let the grass root over it within a few weeks of growth. It is also the method most likely to be hit by a spade, an aerator, or a robotic blade if the cable sits high. Burying to a shallow depth — a spade’s blade rather than a trench — protects the cable while keeping the loop’s signal working; going deeper than the manufacturer allows can weaken the field the mower follows.

For long runs, a cable-laying machine or a hired trencher saves hours on heavy soil and keeps depth uniform, while a clean spade slit and a hand press is enough for a small garden. In cold climates, frost heave lifts shallow wire, so either go deeper or expect to re-peg after the first winter. Whichever method you choose, sketch the route with rough distances. Finding a break later is then a matter of measuring from known points rather than guesswork.

RTK base station placement and mapping runs

An RTK reference station needs an unobstructed view of the sky and a rigid mount: a mast, a gable bracket, or a post with a clear horizon in every direction. Walls, dense canopy and metal roofing all degrade the correction quality the mower depends on, and a station placed next to its own dock can be shadowed by the mower or the building. Correction data arrives either over a radio link from your own base or over the network from a service, which decides whether you are running a cable or paying for a data path.

With the base up, the mapping run is a guided walk. You push or drive the mower around the perimeter and around each exclusion zone while the app records the boundary. Walk it at a steady pace, keep the antenna the way the manual shows, and repeat any segment where the recorded line jumps. Remap after any real change — a new shed, a felled tree, a rebuilt bed — because a stale map produces missed strips that look like a fault.

Where a dealer genuinely earns the money

A dealer install pays for itself on lawns that fight back: grades within a few degrees of the mower’s limit, many beds and trees, narrow gates between areas, long perimeter runs, or ground you cannot dig without hitting irrigation. Dealers turn up with a cable locator, splice kits, a roller for pressing wire flat, and familiarity with the platform’s own install quirks, which usually means a stubborn boundary fault or a localisation problem is fixed in one visit instead of three.

Warranty is the other reason. Some manufacturers expect an authorised installer for the warranty to stand on a machine that arrives damaged or is later diagnosed with a failed wheel motor or control board. Ask before purchase what the warranty requires and what a call-out costs once the first season is over.

On a simple, flat, open rectangle with a handful of obstacles and a socket near the lawn, doing it yourself is a weekend of work — and you finish knowing where every metre of cable lies, which makes every repair afterwards your own.

Shop Robot Mowers

Get Robot Mowers

FAQ

Can I install a robot mower boundary wire myself?

On most wire-guided machines, yes. The cable carries a low-voltage signal and the work is cutting a shallow slit, pegging the loop and connecting the dock. Check your local rules for the outdoor socket and residual-current protection that feed the adapter, and locate irrigation and lighting cables before you dig.

How far apart should boundary wire staples be?

Roughly every thirty to fifty centimetres on open runs is typical, and closer on bends and corners so the cable stays seated. Peg it too sparsely and the loop bows up, catches an edger or floats into the blade path.

Does burying the boundary wire stop it working?

No, as long as you stay within the depth the manufacturer specifies. A shallow slit that puts the cable below the blade plane and under the thatch is the usual target. Burying much deeper can weaken the signal the mower follows.

Where should an RTK base station go?

Where it has an unobstructed view of the sky and a rigid mount, such as a mast or gable bracket, away from metal roofs, dense canopy and the mower’s own dock. Bad placement usually shows up as drifting boundaries and missed strips rather than an obvious error message.

Will installing it myself void the warranty?

Not usually, but some manufacturers require an authorised installer for warranty cover on a damaged machine or a diagnosed motor or board failure. Confirm the requirement in writing before you decide, since it changes the maths on a complex lawn.