Choosing a robot lawn mower shouldn't come down to the first sponsored result you see. Every garden has a different mix of area, slope, obstacles and shape, and those four variables matter far more to the outcome than the robot's brand or design. This guide goes straight to what actually makes the difference between getting it right and ending up with a machine that only does half the job.
How Much Ground You'll Actually Cover
Manufacturers advertise "up to X m²" under ideal conditions: flat terrain, no obstacles, and the robot running many hours a day. In practice, the more flower beds, trees and corners your garden has, the further real performance drifts from that advertised figure.
If your garden is close to a model's upper size limit, step up to the next capacity tier. It's cheaper to pay for that jump now than to find out mid-summer that the robot can't keep up and the grass grows faster than it can mow it.
Perimeter Wire, RTK or Vision Navigation: The Choice That Changes Installation the Most
The perimeter wire is still the cheapest, most proven technology: it's buried or stapled to the ground and physically marks out the mowing area. It's the most sensible option for simple, rectangular gardens.
systems RTK (high-precision satellite positioning) and vision-based navigation remove the wiring and make it easy to create separate zones or irregular shapes, but they cost more and depend on the terrain being relatively free of tall obstacles that could interfere with the signal or camera.
When It's Worth Paying More to Avoid the Wire
If your garden has several disconnected areas (for example, front and back yards separated by a driveway), or you change your garden layout fairly often, wireless navigation saves the cost and hassle of reinstalling the perimeter each time.
Maximum Slope: The Spec That Gets Ignored Most in Practice
The maximum slope a manufacturer states is measured under controlled conditions in a straight line. On a corner where the robot has to turn on a slope, the real traction it needs is higher than that isolated figure suggests. If your garden has uneven ground, don't cut it close on the number — leave margin.
Runtime, Charging Time and Scheduling
More important than runtime in minutes is how many times it needs to recharge to finish your entire lawn, and how long each charge takes. A robot that mows less per session but recharges fast and resumes exactly where it left off usually performs better day-to-day than one with more runtime but slow recharging.
App scheduling lets you set quiet hours (handy if you have neighbors nearby) and adjust frequency by season: grass grows much faster in spring than in peak dry summer.
Safety: Sensors, PIN and Location Lock
A robot lawn mower sits outside, exposed, with blades spinning. These three things aren't extras — they're the basics:
- Lift sensor: stops the blades instantly if someone lifts the robot while it's running.
- Rain sensor: stops mowing on wet grass, which clumps up and strains the motor.
- PIN and geolocation lock: the real difference between getting it back or not if it disappears from your garden.
Maintenance: What Actually Extends the Robot's Lifespan
Blades: The Consumable People Forget About
With regular use during growing season, check the blade edge every 4-8 weeks. A dull blade tears the grass instead of cutting it cleanly, which encourages fungus and leaves the lawn looking worse even if the robot keeps running every day.
Cleaning the base station and wheels
Grass clippings that build up on the housing and wheels reduce traction on slopes and can block the sensors. A quick clean every few weeks prevents most navigation issues.
Winter storage
Most robots are put away for winter: grass barely grows in the cold, and low temperatures damage the battery if left exposed. Store it somewhere dry with the battery at about half charge — not fully charged or fully empty.
Checklist Before Buying
- Your garden's real coverage area checked against the model's capacity, with margin to spare.
- Perimeter Wire or Wireless Navigation based on your garden's shape and zones.
- Maximum slope checked with margin above the manufacturer's figure.
- Lift sensor, rain sensor and PIN/geolocation confirmed on the spec sheet.
- Maintenance plan covered: blades, cleaning and winter storage.
Keep reading
Buying During a Sale Campaign? How to Check If the Deal Is Real → See All Robot Jardín Articles → Back to home →Frequently Asked Questions
How Long Does It Take a Robot Lawn Mower to Pay for Itself vs. Mowing by Hand?
It doesn't pay for itself in direct cash unless you already pay someone to mow — it pays off in time. A scheduled robot mows several short sessions a week, so the grass never grows long enough to need collecting, and that's the real saving compared with weekly manual mowing.
Do I Need to Install Perimeter Wire If My Garden Is Small and Simple?
For a small, rectangular garden without many obstacles, perimeter wire is still the cheapest and most reliable option to install in an afternoon. Wireless navigation (RTK or vision) starts to justify the extra cost once your garden has separate zones, lots of flower beds, or an irregular shape.
What Happens If the Robot Lawn Mower Gets Stuck With a Wet Lawn?
Models with a rain sensor stop mowing and return to base, because cutting wet grass clumps it up and strains the motor. If you live somewhere rainy, prioritize a model with a real rain sensor, not just IP water resistance.
How Often Do You Need to Replace a Robot Lawn Mower's Blades?
With regular use during growing season, check the blade edge every 4-8 weeks and rotate or replace the blades. They're a cheap consumable but easy to forget, and a dull blade tears the grass instead of cutting it cleanly, which encourages fungus and leaves the lawn looking worse.
Does a Robot Lawn Mower Work the Same in Winter, or Do You Need to Store It?
Most robots are put away for winter: grass barely grows in cold temperatures, and intense cold damages the battery if left outside. It's best to store it somewhere dry with the battery at about half charge, then reinstall it once the growing season starts.