Roborock RockMow Z150 Robot Lawnmower

If cutting your grass currently costs you a Saturday, this is the one that gives it back.

The Z150 is the top of the range and it is bought for one reason above all others: throughput. It covers 5,000 m² — an acre and a quarter — and it works at 250 m² an hour, which is half again as fast as either of its smaller brothers. This is the machine that replaces a ride-on, not a push mower.

The maths of a big lawn

Worth doing the sum before you spend the money. At 250 m² an hour, an acre of grass is roughly sixteen hours of mowing — but spread across a week, unattended, in shifts it schedules itself. The 10 Ah battery runs for about 200 minutes before it goes home, and refills in about 60. So it works for well over three hours, rests an hour, and goes again — and the lawn is simply never long.

That is the real change. It is not that the grass gets cut faster on the day. It is that it stops being a job that has to be found time for.

Getting in around things

Big gardens are rarely empty. There are specimen trees, island beds, a rotary line, a swing set. A machine that has to swing wide to turn leaves a ring of long grass around each of them and you end up finishing by hand — which rather defeats the point.

All three four-wheel-drive machines use the same active steering system, so they work their way in around an obstacle and come back out cleanly rather than circling it. On a garden this size that adds up: a dozen trees and beds is a dozen rings of long grass you are not going out to deal with. If you want it neater still along walls and kerbs, the PreciEdge module takes it to within about 3 cm of a hard edge.

Precision across distance

It uses the same full-band RTK positioning as the Z130 — a fixed antenna at the house as a reference, giving centimetre accuracy — with camera-based navigation taking over under tree cover. Over an acre and a quarter that accuracy is not a luxury; it is what stops the machine drifting and leaving strips. Up to 15 zones, each scheduled separately, which on a garden this size is how you keep the lawn near the house sharp and let the far end grow on.

Four-wheel drive with the same 80% climbing ability as the others, and IPX6 weatherproofing with rain and frost sensors.

A machine that lives outdoors

This is a valuable thing sitting on your lawn unattended, so it is worth knowing what protects it. There is a movement alarm, a PIN lock, live GPS tracking and AirTag compatibility, and the 4G connection comes with three years included — so it stays contactable well beyond the reach of the house WiFi and you can see where it is from anywhere.

Obstacle detection works the same way as the rest of the range: it identifies what is in front of it and routes around, rather than finding it with the bumper. Lift or tilt it and the blades stop.

The numbers

• Covers up to 5,000 m² at 250 m² an hour — the fastest in the range
• Cuts 24 cm wide, 20–70 mm high, adjusted electrically
• 10 Ah battery — about 200 minutes mowing, about 60 minutes to recharge — the longest run of anything we sell
• Full-band RTK with camera backup · 4WD with active steering · slopes to 80% · climbs 8 cm
• Up to 15 zones · WiFi, Bluetooth and 4G with three years included
• Alarm, live GPS, PIN lock, AirTag compatible · IPX6 · 21.5 kg

Come and see it before you buy it

We would genuinely rather you did. It is a serious piece of kit and fifteen minutes watching one work on the demo lawn tells you more than any amount of reading. We will map your garden with you, set the zones and the schedule before it leaves, and get the antenna sited properly — on a garden this size that last part matters.

Who actually buys this one

People with an acre or more, usually with a ride-on they are tired of. Guesthouses and small hotels. A couple of GAA clubs. If your lawn is under three-quarters of an acre the Z130 will do the same job for less money, and we will tell you so — ring us with the size and we will work it out with you.