500 or 1000 m² robot mower? Match capacity to your garden and hours
For 450 m² of grass, a mower rated for 500 m² is not automatically unsuitable, and a 1000 m² model is not automatically necessary. Geometry, connections between zones and permitted operating hours also determine the fit.
There is no universal percentage margin for every garden. Build a simple operating plan and check it against two actual models rather than buying extra nominal area without a defined reason.
Measure grass, not the plot
Subtract buildings, drives, terraces, beds and other non-mown areas. Divide the remaining grass into zones and record whether the mower can travel between them.
A hypothetical 900 m² property may contain only 420 m² of lawn. Conversely, 420 m² divided into isolated patches may require more attention than a larger simple lawn. Total area does not describe every constraint.
| Zone | Area | Access | Note |
|---|---|---|---|
| Main lawn | 300 m² | Direct from dock | Main scheduled workload |
| Front lawn | 80 m² | Connecting passage | Verify travel and return |
| Side lawn | 40 m² | Separate | Confirm separate-zone handling |
| Total | 420 m² | Editorial example |
Rated area is not necessarily one battery charge
Check the manufacturer’s definition and operating assumptions. Do not assume the area figure means completion on one charge. Likewise, an hourly mowing figure may exclude charging, return trips and non-cutting travel.
For variants in one family, compare actual differences: battery, charging time, drive, map limits and equipment. A 1000 label does not prove every capability is twice that of the smaller version.
Avoid deriving a schedule from battery capacity alone. You need a supported plan or a representative demonstration.
Calculate the available weekly window
List the hours when operation is actually acceptable, accounting for garden use, applicable restrictions and safe-use instructions. Then consider mowing, charging and travel within that window.
Suppose you permit five days of four hours: 20 hours weekly. An evidence-based plan for model A might occupy 16 hours and one for B 12 hours, leaving four and eight hours of reserve. These are hypothetical planning values, not a conversion from 500 and 1000 m² labels.
Lose one four-hour day and A now fills the remaining window, while B retains four hours. That explains a useful reserve. A blanket rule to buy a fixed percentage more area does not explain the benefit.
What extra nominal capacity cannot establish
| Constraint | Confirm |
|---|---|
| Narrow connector | Permitted geometry and actual passage |
| Slope | Supported conditions and traction on that surface |
| Separate lawn | Operation without independent access |
| Difficult boundary | An approved route and boundary arrangement |
| Poor dock access | Location and successful return |
| Restricted hours | A schedule compatible with household needs |
A larger-rated version may also have different navigation or drive hardware, but verify this. The area number alone does not establish better slope handling or passage capability.
Give the seller a real brief
Send the zone plan, photographs of difficult areas and permitted hours. Ask for a schedule including charging and returns. Discuss recovery after several missed days and when grass requires preparation by another method according to the manual.
If a demonstration is available, include the hardest required connection and the return trip. A successful pass across the easy area beside the dock does not prove whole-garden suitability.
Record which answers come from documentation and which are estimates. A general assurance is not a measurement of your property.
When the larger model is worth buying
Pay more when the actual larger model completes the required work within your available hours, provides useful recovery capacity or supports a genuinely planned extra zone. Each added capability should address a named need.
If both models finish with adequate reserve, compare price, support, consumables and remaining manual work. Do not select solely by the largest label. Where a terrain constraint is decisive, make compatibility with it the primary criterion.
After installation, keep a season log and measure electricity. The process and numerical examples are editorial planning tools; the hypothetical times are not attributed to products.