Greenworks Optimow 50H · Robomow RK4000

Cellular control takes the home network out of the picture. The GreenGuide app reaches the mower from anywhere over 4G and integrated GPS reports its position, but the machine carries an always-on cellular modem, and the pre-installed SIM is prepaid for two years before connectivity becomes a recurring cost.

Boundary-wire guidance eliminates line-of-sight operator control, but requires significant one-time and seasonal infrastructure maintenance that systematic-mapping systems avoid.

Random coverage patterns reduce planning complexity, but result in less uniform grass height and longer mowing cycles than systematic mapping approaches.

Owners unable to install a perimeter wire

Containment is a buried boundary wire: 600 feet of wire and 400 staples ship in the box. The mower's integrated GPS is used for location tracking rather than for containment, so there is no wire-free boundary option.

Yards steeper than the rated 35 percent slope

Greenworks publishes a maximum slope of 35 percent, about 19 degrees. The slope rating is the safety-relevant limit on a robotic mower, and terraced ground or banks steeper than the rating sit outside what the machine is built to hold.

Lawns already overgrown well past four inches

Cutting height adjusts from 2.4 to 4 inches across nine positions. A robotic mower takes a small amount off often rather than reducing a tall lawn in one pass, so grass well above the top cutting height needs a conventional mow before the Optimow takes over.

Complex yards requiring precise perimeter definition

Properties with irregular boundaries, multiple islands, or intricate garden beds require frequent wire adjustments and manual intervention unsuitable for autonomous operation.

Operators unwilling to manage seasonal wire maintenance

Wire inspection, replacement, and winterization add overhead unsuitable for users preferring fully hands-off operation beyond blade swaps.

Small lots well inside the rated area

The RK4000 is rated for lawns up to 4,000 sq m, sold in the US as up to one acre. On a few hundred square meters the mower, its base station and its wire run are more hardware and more installation than the ground calls for.

Terrain steeper than the rated slope

Robomow's published maximum mowing slope for the RK4000 is 45 percent, which is 24 degrees. Banks steeper than that are outside the rating.

Owners prioritizing stripe patterns or aesthetic consistency

Perimeter-first with randomized fill does not produce striped patterns or uniform cutting height; systematic mapping mowers better suit aesthetic lawn maintenance.