Greenworks Optimow 15 · Yard Force Compact 400Ri

Wire installation is the price of entry: the Optimow 15 delivers genuine unsupervised mowing, but only after the owner commits several hours to perimeter-wire layout and staking.

Randomized cutting works, but systematic GPS-based mowing completes large areas faster and with more predictable pass distribution; the Optimow 15 trades path efficiency for a lower price tier.

iRadar safety sensing increases cost but does not upgrade autonomy level. Ultrasonic obstacle detection reduces collision frequency (owner reports cite fewer dock impacts); the mower remains wire-dependent and cannot operate without boundary infrastructure.

Yards exceeding 1,500 m² (0.37 acres)

The 1,500 m² coverage ceiling is a documented hard limit. Larger properties require a higher-capacity model; exceeding the rated area results in incomplete coverage cycles.

Owners who cannot or will not install perimeter wire

The Optimow 15 requires perimeter wire for all boundary definition. No GPS or camera-based wire-free operation is supported. Wire installation is mandatory, not optional.

Properties with dense obstacles or numerous internal garden beds

Randomized-pattern mowers lack systematic zone mapping. Dense obstacle fields or numerous internal garden beds require extensive guide-wire loops, adding installation complexity and wire-break risk.

Slopes exceeding 35% or areas with loose surface conditions

The 35% gradient rating is the published hard limit. Steeper sections or slopes with wet clay at the boundary are outside the documented operating envelope.

Households requiring Wi-Fi or local-network integration

Connectivity runs over GSM (cellular module), not home Wi-Fi. Smart-home integrations dependent on local Wi-Fi are not supported on this model.

North American buyers with limited service and parts availability

Yard Force support ecosystem is EU-first; repair and part sourcing in North America faces long lead times and high costs. Regional authorization is sparse.

Yards larger than 4,000 sq ft or with dense obstacles

A 16 cm cutting width and a 400 m2 rating cap effective coverage; iRadar obstacle sensing helps but does not enable efficient multi-zone operation or layout-change adaptability. Ground steeper than the rated 30 percent incline is outside what the machine is built for.

Owners seeking wire-free or GPS-based autonomy

Yard Force Compact 400Ri is wire-guided only; ultrasonic sensing is a safety layer, not a navigation alternative. RTK or vision-based mowers offer different operational models.