How much electricity does a robot mower use? Monthly and seasonal costs
The robotic mower runs for a long time, but uses a small battery and a lightweight cutting system. Therefore, its energy consumption is usually small compared to many home appliances. Differences between models and gardens can still be twofold, especially when the robot works on the maximum area.
European price context: euro figures on this page are deliberately rounded buying-context bands based on the verified Polish offer snapshot. They are not live country-specific retail prices and are not presented as an exact FX conversion. Always verify the current local offer before purchase.
How much energy do manufacturers provide?
GARDENA publishes the average monthly consumption at maximum utilization for selected robots. For example, smart SILENO life 750 has a declared capacity of approximately 4 kWh per month, smart SILENO free 800 has approximately 6 kWh, and some of the larger models have approximately 7-8 kWh.
| Monthly consumption | Season 7 months | Cost at an example price of about €5/kWh |
|---|---|---|
| 4 kWh | 28 kWh | about €10 |
| 6 kWh | 42 kWh | about €10 |
| 8 kWh | 56 kWh | about €15 |
Note: about €5/kWh in the table is only an easy multiplier, not the current tariff. To calculate the cost, enter the full energy price with variable fees appropriate for your contract.
What increases energy consumption?
- work on the maximum declared area;
- a lot of slopes and frequent starts uphill;
- wet or tall blades increasing drag;
- inefficient route and frequent U-turns;
- long trips between zones;
- worn blades, dirty wheels and chassis;
- low temperature limiting battery performance.
Why can a small battery last so long?
The robot does not attempt to cut tall grass once. Regularly removes a few millimeters of blades using lightweight blades. The cutting motor has a much lower load than a classic mower that collects long grass into the basket.
How to calculate the cost of your own robot
- Check the specifications for declared monthly consumption or battery capacity and number of cycles.
- Determine the number of months of the actual mowing season.
- Multiply the monthly kWh by the number of months.
- Multiply the result by the full cost of 1 kWh from your bill.
- Add a small margin for charging losses and station operation.
Does photovoltaics change the bill?
The robot usually charges multiple times and can also consume energy in the evening. Production from a PV installation can cover part of the charging, but with such a small annual consumption, the financial savings will be small. The charging schedule and auto consumption of the entire house are more important.
Electricity is not the biggest cost
Over the entire period of use, the purchase price, blades, possible battery, service, connectivity and time spent on cleaning and edge corrections are more important. Low energy consumption does not automatically mean that the purchase will pay off quickly.
Verdict
Energy is one of the smallest items in the costs of a robot mower. The best way to reduce consumption is to choose the right surface, sharp knives, a clean robot and a schedule that matches the grass growth.
Energy consumption and area
A robot on a small lawn does not need to use its full battery capacity every day. An oversized model may operate for a shorter period of time, but greater weight and electronics do not always mean lower consumption. The most important thing is the mowing pace, the number of cycles and the time spent in the station.
How to estimate energy without manufacturer's data
If you know the battery capacity in Wh, divide it by 1000 to get kWh for a full charge. Then multiply by the number of full cycles per month and add 10-25% for charging losses and station consumption. This is an estimate because the robot rarely charges always from zero to 100%.
| Battery | 20 complete cycles | After adding 20% loss |
|---|---|---|
| 100 Wh | 2.0 kWh | 2.4 kWh |
| 200 Wh | 4.0 kWh | 4.8 kWh |
| 400 Wh | 8.0 kWh | 9.6 kWh |
Station consumption at rest
The station and power supply may also consume a small amount of power when the robot is not charging. If the manufacturer does not provide data, you can use an energy meter plugged into the socket. Measuring for a full week during a typical growing period will give a much better result than a single charge.
Does mowing more often use more?
More operating hours increase wear and tear, but cutting short grass regularly reduces the stress on the blades. Mowing tall turf infrequently may require driving slower, making several passes and cleaning more frequently. The most effective is a schedule that maintains a constant height without unnecessary work on the already mowed area.
How to reduce consumption
- Select a robot with reasonable headroom, but not extreme oversize.
- Use growth rate dependent schedule.
- Replace blades and clean the chassis regularly.
- Reduce long transport aisles.
- Disable mowing during drought when the grass hardly grows.
FAQ: Energy and Charging
Does a larger robot always consume more electricity?
Usually has a larger battery and motors, but can get the job done faster. Actual consumption depends on hours, route and terrain, not just battery capacity.
Should I leave the station connected all season long?
Follow the instructions. Most systems are designed for constant power during the season, but special recommendations may apply during storms, service or winter storage.
Can wear be checked with a meter?
Yes. The power meter in the socket measures the entire set: charging, power supply losses and station consumption. It is best to observe a full week and convert the result to a typical month, taking into account the change in grass growth rate.
Related Tabs in Robot Database
See the entire RoboMorrow Robot Database.
Related guides
Sources and verification date
The article was prepared based on manufacturer data and institutional materials available on August 3, 2026. Software parameters, prices, availability and functions may change.