Robot Lawnmowers: A Guide to the Latest Tech and What to Consider
Robot lawnmowers are now widely available from major retailers, starting at around $500. These devices are controlled via smartphone apps and use advanced technologies like geofencing, LiDAR, and AI for navigation. However, older models may still require a boundary wire and often lack obstacle detection.
How They Operate
Most modern robot mowers are app-controlled and return to a powered docking station to charge.
Newer models use geofencing—similar to GPS—to map the yard and identify obstacles like trees. Some also incorporate LiDAR and AI for continuous image mapping and pattern recognition.
Maintenance and Effectiveness
Robot mowers leave clippings on the lawn and perform best with frequent use. They are notably less effective on lawns that have grown for two to three weeks.
Residential vs. Acreage Blocks
Residential Blocks: Typical models cover 250–1000 sqm, with prices ranging up to several thousand dollars depending on features. Buyers should verify their lawn's slope, as maximum slope capability is specified by manufacturers.
Acreage Blocks: Models are available for lawns up to 5000 sqm, though they cost more—around $6000. Manufacturers recommend choosing a model rated for a slightly larger yard than your own. For example, Peter French, a retired cotton farmer, uses a model designed for 5000 sqm on his 3000 sqm block. It uses satellite tracking and allows no-go zones, but it struggled with wet grass, requiring weekly cleaning.
Key Features to Consider
Choice recommends looking for:
- A long warranty
- Availability of replacement parts
- Removable batteries for easy replacement
Safety features include lift and bumper sensors, retractable blades, and emergency stop buttons. It is advised to keep children and pets away while mowing, and to remove dog waste beforehand.
Expert Insights
Matthew Steen (Choice Director of Testing) notes that robot lawnmowers avoid obstacles through pattern recognition and that slope capability should be checked in specifications.
Dallas 'Rusty' Garton (lawn care expert) states that older models without obstacle detection can get stuck on items like garden hoses or dog toys. He reports using the same robotic mower for five years on a 350 sqm lawn, describing them as 'set and forget' and quiet enough to run at night.
Peter French reports that satellite tracking works well but wet grass causes clogging. He has difficulty obtaining replacement parts from the manufacturer.