Choose a robot mower by matching your measured lawn area, steepest slopes, boundary conditions, routes between zones, and navigation needs to the exact model’s specifications. A headline slope rating is not enough: a mower may be rated for a steeper incline while mowing than it can handle at the lawn’s edge, and manufacturer ratings do not guarantee performance on your grass, terrain, or in wet conditions.
Start by measuring the site
Map the grass the mower will actually maintain, not the full property. Exclude beds, paving, and other non-grass areas. Measure the steepest sections and note whether each is inside the mowing area or along an edge. Also record narrow passages, gates, turns, separate lawn sections, obstacles, drop-offs, and where the mower will charge.
Calculate slope as a percentage
Slope percentage is the vertical rise divided by the horizontal distance, multiplied by 100. Husqvarna’s example is a 15 cm rise over 100 cm of horizontal distance: 15% slope. Percentage is not the same as degrees, so use the same measurement method when comparing your yard with a manufacturer’s rating. Husqvarna’s slope guidance explains the calculation.
For a useful site record, note:
- Mowable grass area and the exact model’s recommended area.
- Steepest incline inside the lawn and steepest incline at each boundary.
- Passage widths, turns, gates, and the route connecting separate grass areas.
- Trees, buildings, overhangs, obstacles, no-go areas, and possible satellite signal obstructions.
- Wet or uneven patches, road edges, and other places where traction or boundary control may be difficult.
Compare specifications that affect a difficult yard
| What to compare | What to record | Why it matters |
|---|---|---|
| Lawn capacity | Your measured mowable area versus the exact model’s rated or recommended area | A complicated layout can take more effort to cover than a simple open lawn. EGO advises choosing a model rated above the actual lawn area and accounting for slope, passages, zones, and obstacles. |
| Work-area slope | Maximum incline listed while mowing within the perimeter | This rating may be higher than the allowed incline at the edge. |
| Boundary slope | Maximum incline listed at the perimeter or virtual boundary | A mower’s ability to climb a slope within the lawn does not establish that it can safely approach or cross a steep edge. |
| Navigation and coverage | Boundary wire, RTK-GNSS, vision, or a combined system; station or antenna needs | Satellite reception, tree cover, buildings, and boundary setup affect whether a navigation system suits the site. |
| Zones and transitions | Supported zones, passage width, path between sections, and charging return route | Separated areas need a practical route or a supported way to connect them. |
| Terrain and setup | Obstacles on slopes, wet grass, uneven ground, mapping process, connectivity, and installation support | Turns and low traction can increase slipping risk, while unclear boundaries or connectivity may make setup harder. |
Keep work-area and boundary slope ratings separate
Manufacturers publish different limits for different models, and the boundary figure can be substantially lower than the work-area figure. For example, Husqvarna lists the 435X AWD and 435X AWD NERA at up to 70% in the work area and 50% at the boundary. Its table lists the 320 NERA, 430X NERA, and 450X NERA at 50% and 25%, respectively; the 305E NERA, 310E NERA, 405XE NERA, and 410XE NERA are listed at 30% and 20%. These are manufacturer figures for named models, not a brand-wide capability or an independent performance test. See Husqvarna’s model-by-model slope guidance.
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ECOVACS lists its GOAT O1000 RTK at up to 45% in the work area but 17% at the virtual boundary. The same product page lists a 0.7 m narrow-passage capability based on ECOVACS laboratory results and cautions that results can vary with grass, lawn size, terrain, and environment. Treat that passage figure as a qualified company claim, not a guarantee for your route. ECOVACS’ O1000 RTK specifications provide the details.
Exclude sections beyond the exact model’s stated limits. Husqvarna advises that obstacles can force turns that raise slipping risk, particularly in wet conditions; for some installations it recommends mowing straight up slopes for traction and less grass wear. If an outer edge is too steep, its guidance suggests moving the boundary to flatter ground or isolating the over-limit area. Husqvarna also says a slope bordering a public road should have a protective barrier, such as a wall or fence, at least 15 cm (6 in) along the outer edge. This is manufacturer installation advice; check local requirements.
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Choose navigation for the yard, not the marketing label
Wire-free systems are not interchangeable. Confirm how the specific mower establishes boundaries, maps zones, travels between them, and returns to its charger. If it relies on satellite positioning, assess whether trees, buildings, or overhangs may obstruct reception and whether an on-site station or antenna is required.
RTK satellite positioning
Husqvarna describes its commercial 550H EPOS as using RTK-GNSS for wire-free boundaries, with accuracy down to approximately 2 cm, and says an EPOS reference station must be installed on site. Its virtual transport paths can connect work areas across non-mowing zones. Those are claims for this particular model and setup, not a general feature of every wire-free mower. Husqvarna’s 550H EPOS product page gives its system details.
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RTK combined with vision
EGO Europe describes its AURA-R2 1500 m² model as using PATH IQ with RTK and VSLAM, supporting up to a 50% gradient and mapping as many as 40 zones. EGO says the combination of RTK and vision can help where satellite signals are weak or blocked. It also says unclear lawn edges on this product require manual control throughout the mapping process. These are product-page claims for the cited model; check the current specifications for the exact version sold in your region. EGO’s AURA-R2 page includes its mapping and selection guidance.
Camera and depth-sensing combination
ECOVACS lists RTK, camera, and 3D ToF among the O1000 RTK’s navigation technologies. The presence of multiple sensors does not remove the need to verify its slope, passage, and boundary limits against your site. The O1000 RTK product page describes the listed system.
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Check capacity and mapping against the layout
Use area ratings as a starting point, then account for the real shape of the lawn. EGO recommends selecting above the measured area and considering slopes, narrow passages, multiple zones, and obstacles. Its AURA-R2 1500 m² model is listed for up to 40 zones, but that does not mean every property with 40 sections or a similar area will be suitable: routes, reception, boundaries, and setup still matter.
Dreame lists the A2 at 3,000 m² mowing capacity and a 50% maximum slope. Its page says automatic boundary setup applies when lawn boundaries are clear; unclear complex gardens require manual control for the entire mapping process. Dreame labels some performance data as in-house laboratory data and says actual performance may vary. Verify the exact model’s terms and limitations before relying on a headline capacity or slope figure. Dreame’s A2 product page states its specifications and mapping caveats.
Best Value
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Decide whether the site needs a survey or installation help
A site survey is sensible when you cannot confidently measure the steepest boundary, establish that zones connect, or determine whether satellite signals will reach the whole lawn. EGO recommends dealer support for uncertain setups. For its cited AURA-R2 product, EGO also says unclear lawn edges require manual control for the full mapping process. Ask a dealer to assess the actual route, edge conditions, and connectivity rather than relying on the property’s total area alone.
Before buying, ask the seller or manufacturer to confirm these points for the exact model and regional version:
Quick Recap
- Are the work-area and boundary slope limits both suitable for your measurements?
- Does the rated lawn area leave enough headroom for your zones, passages, and obstacles?
- Can the mower reach every grass section and return to charge using the supported paths?
- Does its navigation require a reference station, antenna placement, or manual mapping?
- Which areas should be excluded because of steepness, poor traction, unclear edges, or unsafe drops?
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