Roborock RockMow Z115 Robot Lawnmower

Four-wheel drive, without the big-garden price.

The Z115 is the way into the four-wheel-drive machines. It handles 1,500 m² — the same as the S115 — but where that one is built for a flat lawn, this is built for ground that goes up, down and soft underneath. Around here that is most gardens.

What the four-wheel drive buys you

• Slopes to 80% — about 39 degrees, steeper than you would happily push a mower up, and nearly double what the rear-wheel-drive models manage.
• It climbs an 8 cm step without help — twice what the S and Q machines will take on — so a raised path or a tree root is not the end of the run.
• It keeps its feet on wet ground where a two-wheel-drive machine sits and spins. Worth knowing in a Monaghan September.

Underneath there is a sprung chassis that lets each side move independently, and a cutting deck that floats over the contours rather than scalping the high spots. On drumlin ground that is the difference between a lawn that looks mown and one that looks grazed.

Built to keep going

Six blades rather than three, on a 24 cm deck — wider than the S and Q machines — working at 140 m² an hour. It is the setup you want for thick or neglected grass, where a three-blade machine starts pushing the grass over instead of cutting it. Cutting height runs from 20 to 70 mm and adjusts electrically from the app.

The 6 Ah battery gives two hours of mowing and fills again in an hour, so it works in shifts and gets round a third of an acre without you thinking about it. At 61 dB an evening run will not have anyone looking out the window.

Finding its way

Full-band RTK with camera backup: an antenna goes up somewhere with a clear view of the sky, and under tree cover it switches to reading what its cameras see. It maps the garden itself — no wire to bury, no trench to dig along the hedge. Obstacle detection routes it around toys, tools and wildlife, and lift or tilt stops the blades immediately. IPX6, with a rain sensor that sends it home when the weather comes in.

It minds itself

Unlike the smaller machines, the tracking hardware is built in rather than bought as an extra — 4G, live GPS and a PIN lock come as standard. Move it off the lawn and an alarm goes off; whoever has it cannot do anything with it without the code. On something that sits out on its own all summer, that is worth having.

The numbers

• Covers up to 1,500 m² at 140 m² an hour
• Cuts 24 cm wide, 20–70 mm high, adjusted electrically, six blades
• 6 Ah battery — about 120 minutes mowing, about 60 minutes to charge
• Full-band RTK with camera backup · 4WD · slopes to 80% · climbs 8 cm
• Up to 15 zones · 61 dB · IPX6 with rain sensing · 21.2 kg
• WiFi, Bluetooth and 4G · alarm, live GPS and PIN lock built in

Z115 or S115?

Same area, different ground. Flat lawn with a lot of edging — the S115, which runs half an hour longer per charge and has the edge module in the box. Hills, banks, soft ground or a step to climb — this one. If the lawn is bigger than a third of an acre, keep going up to the Z120, Z130 or Z150. Ring us and we will work it out with you.