How much electricity does a robot mower use?

For the four machines we track whose packs are fully published, one full charge holds 72 to 298 watt hours. At the EIA published US average residential price of 18.44 cents per kWh for May 2026, that is about 1.3 cents to 5.5 cents of energy per full charge before charger losses. Over a 26 week season at three charges a week, it works out to roughly $1.04 to $4.29 of mowing energy. Those are floors, because no maker publishes charger efficiency or standby draw.

Why can you not compute this for every robot mower?

Because watt hours need volts. Husqvarna publishes a 5 Ah Li-Ion battery and a 4.2 A charging current for the Automower 420 iQ but no voltage. Segway's X3 spec table publishes 8 Ah, 10 Ah and 12.8 Ah packs across the X3 series with no voltage, and the Navimow i110 product page publishes charging time and mowing time but no battery capacity at all. Dreame publishes 7.5 Ah for the A3 AWD Pro 3500, Sunseeker publishes a 10 Ah battery and a 5 A charger for the X7, and Mammotion publishes 12 Ah for the LUBA 3 AWD 3000. Amp hours alone cannot be converted to watt hours, so we state the gap rather than assume a voltage.

What electricity rate should I use?

Your own, from your bill. The rate used here is the EIA published average price of electricity to ultimate customers in the residential sector, 18.44 cents per kWh for May 2026, from the Electric Power Monthly released July 23, 2026. The same table puts the rolling 12 months ending May 2026 at 17.82 cents. Residential rates vary widely by state, so treat the national average as a scale check rather than as your number: the cost scales linearly, so doubling the rate doubles every figure on this page.

Does the charging station draw power when the mower is not charging?

It almost certainly draws something, and none of the makers we read publish how much, which is why every figure here is a floor rather than a total. One manufacturer claim points at the size of the omission: Mammotion's LUBA 3 AWD product page markets an EcoSleep mode that saves up to 100 kWh per year, with no basis published for the figure. At the EIA May 2026 residential average that would be about $18 a year, which is larger than the entire computed mowing energy cost of any machine on this page.

Robot mowers buying guide

What a robot mower adds to your electric bill, computed from published battery specs

The energy a robot mower can draw in one charge is capped by the size of its battery, so the cost per charge is arithmetic rather than opinion, provided the maker publishes both the capacity and the voltage. Four of the eleven mowers we publish pages for do. For the other seven, the spec sheet gives amp hours with no voltage, or no battery figure at all, and the calculation cannot be honestly finished. Every figure below is a floor: charger and conversion losses are real and unpublished, so the wall draw is higher than the pack capacity, never lower.

Figures in this guide come from the manufacturer datasheets behind our model pages, verified 2026-08-06.

The rate, and where it comes from

One external number is needed to turn watt hours into dollars, and it should be a government one. The US Energy Information Administration publishes the average price of electricity to ultimate customers by end use sector in Table 5.3 of its Electric Power Monthly. The edition released on July 23, 2026, carrying data for May 2026, puts the residential sector average at 18.44 cents per kWh, with a rolling 12 month figure of 17.82 cents for the year ending May 2026.

We use 18.44 cents throughout. Because the arithmetic is linear, you can rescale everything here to your own rate in one step: multiply by your rate in cents and divide by 18.44. If your utility bills you at 30 cents, every dollar figure below grows by about 63 percent, and stays small.

Which packs can be computed at all

Watt hours are volts times amp hours, so the calculation needs both. Four of the eleven mowers we publish pages for have both published, and it is worth noticing where those figures come from: two are on a live product page, one is in a downloadable manual, and one belongs to a machine that has been delisted from the US market. Only one of the four is a current, in stock, US listed mower.

The Worx figure carries a caveat that travels with it. Worx publishes the WR208 as a 20 V Max platform with a 4.0 Ah battery, and 20 V Max is a maximum cell voltage label rather than a nominal one, so 80 Wh is a ceiling on that pack, not a nameplate rating. We use it as published and flag it here rather than quietly substituting a nominal 18 V.

Ecovacs GOAT O1000 RTK: energy platform 18 V, battery capacity 4000 mAh, charging current 1.8 A, published in the US spec table. 18 V x 4.0 Ah = 72 Wh.
Worx Landroid Vision WR208: power voltage supply 20 V Max, battery capacity 4.0 Ah, charging current 1.5 A, published in the US tech specs. 20 V x 4.0 Ah = 80 Wh, treated as a ceiling.
Mammotion LUBA 2 AWD 3000HX: 21.6 V, 12 Ah pack published in Table 6-2 of the official LUBA 2 AWD X Series user manual. 21.6 V x 12 Ah = 259 Wh.
EcoFlow Blade: 298 Wh, 21.6 V lithium-ion battery published directly in the EcoFlow Blade user manual V2.0. No conversion needed; the maker publishes watt hours.
Not computable: Automower 420 iQ (5 Ah, no voltage), Navimow X350 (10 Ah, no voltage), Navimow i110N (no battery capacity published), LUBA 3 AWD 3000 (12 Ah, no voltage), YUKA mini 2 1000H (6.1 Ah, no voltage), Dreame A3 AWD Pro 3500 (7.5 Ah, no voltage), Sunseeker X7 (10 Ah, no voltage).

Cost per full charge

At 18.44 cents per kWh, the energy stored in one full pack costs between about 1.3 cents and 5.5 cents across the four computable machines. That is the number people are usually looking for, and it is worth stating plainly that it is smaller than almost any other line item in owning one of these machines.

Read the direction of the error correctly. Pack capacity is the energy delivered to the battery, not the energy pulled from the wall: charging and conversion losses sit on top, and none of these makers publish a charger efficiency, so the wall figure is higher by an unpublished margin. In the other direction, a mower that docks half discharged draws less than a full charge. So the per charge figures below are floors for a full cycle, and the season figures depend entirely on how many full cycles you assume.

GOAT O1000 RTK, 72 Wh: about 1.3 cents per full charge.
Landroid Vision WR208, 80 Wh ceiling: about 1.5 cents per full charge.
LUBA 2 AWD 3000HX, 259 Wh: about 4.8 cents per full charge.
EcoFlow Blade, 298 Wh: about 5.5 cents per full charge.

Cost per season, with charges per week as the stated assumption

Nothing about your season is published by anyone, so it goes in as a labeled assumption. Three scenarios below bracket the plausible range: a light duty case of two charges a week across a 26 week season (52 charges), a middle case of three charges a week across 26 weeks (78 charges), and a heavy case of seven charges a week across a 36 week season (252 charges), which is roughly a daily cycle across a long southern season.

The result across every machine and every scenario is a number under fifteen dollars. Even the heavy case on the largest pack we can compute, the 298 Wh EcoFlow Blade at 252 charges, is 75 kWh and about $13.85 of energy across the whole season. Runtime and charge time drive how often the machine cycles, and those are published unevenly too; robot mower runtime and charge time sets out which makers publish what.

52 charges (2 per week, 26 weeks): $0.69 (72 Wh), $0.77 (80 Wh), $2.49 (259 Wh), $2.86 (298 Wh).
78 charges (3 per week, 26 weeks): $1.04 (72 Wh), $1.15 (80 Wh), $3.73 (259 Wh), $4.29 (298 Wh).
252 charges (7 per week, 36 weeks): $3.35 (72 Wh), $3.72 (80 Wh), $12.05 (259 Wh), $13.85 (298 Wh).
All at the EIA residential average of 18.44 cents per kWh for May 2026, and all before charger losses.

Why these are floors, and what is missing above them

Three unpublished draws sit on top of every figure on this page. Charger and conversion losses come first: the wall always delivers more than the pack stores, and no maker in this set publishes an efficiency. Standby comes second, and it runs whether or not the machine is mowing, covering the docking station, the mower's own sleep current, and on satellite positioned machines a powered RTK reference station that many makers instruct you to leave outdoors and connected. Cellular modules are the third, and several of these mowers ship with a built in 4G module that is powered whenever the machine is.

One manufacturer claim gives a sense of scale for the part we cannot compute. Mammotion's LUBA 3 AWD product page, read on 2026-08-06, markets an EcoSleep mode that saves up to 100 kWh per year. No basis, test condition, or comparison state is published for that figure, and it is a savings claim rather than a consumption figure, so we quote it as Mammotion's claim about its own hardware and nothing more. Taken at face value at 18.44 cents per kWh it is worth about $18 a year, which is larger than a full season of computed mowing energy on any machine in this guide. If a standby mode can save that much, standby is where the real electricity goes, and it is precisely the number nobody publishes.

The practical consequence is a modest one. Mowing energy is small enough that it does not decide anything, which is why our robot mower vs lawn service cost comparison carries it as a bracketed line rather than a computed total for machines whose packs are unpublished.

Where the record has gaps

The headline gap is voltage. Seven of the eleven mowers we publish pages for advertise a battery in amp hours with no voltage anywhere in the published spec table: 5 Ah on the Automower 420 iQ, 6.1 Ah on the YUKA mini 2 1000H, 7.5 Ah on the Dreame A3 AWD Pro 3500, 10 Ah on the Sunseeker X7 and the Navimow X350, and 12 Ah on the LUBA 3 AWD 3000. An amp hour figure without a voltage is a marketing number, not an energy figure, and every guide that turns those into kilowatt hours has assumed a voltage without saying so. The Navimow i110N goes further and publishes no capacity at all, only a 120 minute Full Charge Mowing Time and a 120 minute charging time.

Charging current has the same problem. Husqvarna publishes 4.2 A for the 420 iQ, Ecovacs 1.8 A for the GOAT O1000 RTK, Worx 1.5 A for the WR208, and both Sunseeker and Dreame publish a 5 A charger. Without a voltage those cannot be turned into watts either, so they cannot be used as a back door to charger power.

Nobody in this set publishes an annual energy consumption figure for a robot mower, a standby power draw for a charging station or an RTK reference station, or a charger efficiency. That means no one, including us, can publish a true total annual cost of running one of these machines from manufacturer data. What is defensible is the floor computed above, and the fact that it is small. This omission has plenty of company in our running list, what yard robot makers do not publish, and the question of whether the machine earns its keep overall is taken up in are robot mowers worth it.

Frequently asked questions

How much electricity does a robot mower use?: For the four machines we track whose packs are fully published, one full charge holds 72 to 298 watt hours. At the EIA published US average residential price of 18.44 cents per kWh for May 2026, that is about 1.3 cents to 5.5 cents of energy per full charge before charger losses. Over a 26 week season at three charges a week, it works out to roughly $1.04 to $4.29 of mowing energy. Those are floors, because no maker publishes charger efficiency or standby draw.
Why can you not compute this for every robot mower?: Because watt hours need volts. Husqvarna publishes a 5 Ah Li-Ion battery and a 4.2 A charging current for the Automower 420 iQ but no voltage. Segway's X3 spec table publishes 8 Ah, 10 Ah and 12.8 Ah packs across the X3 series with no voltage, and the Navimow i110 product page publishes charging time and mowing time but no battery capacity at all. Dreame publishes 7.5 Ah for the A3 AWD Pro 3500, Sunseeker publishes a 10 Ah battery and a 5 A charger for the X7, and Mammotion publishes 12 Ah for the LUBA 3 AWD 3000. Amp hours alone cannot be converted to watt hours, so we state the gap rather than assume a voltage.
What electricity rate should I use?: Your own, from your bill. The rate used here is the EIA published average price of electricity to ultimate customers in the residential sector, 18.44 cents per kWh for May 2026, from the Electric Power Monthly released July 23, 2026. The same table puts the rolling 12 months ending May 2026 at 17.82 cents. Residential rates vary widely by state, so treat the national average as a scale check rather than as your number: the cost scales linearly, so doubling the rate doubles every figure on this page.
Does the charging station draw power when the mower is not charging?: It almost certainly draws something, and none of the makers we read publish how much, which is why every figure here is a floor rather than a total. One manufacturer claim points at the size of the omission: Mammotion's LUBA 3 AWD product page markets an EcoSleep mode that saves up to 100 kWh per year, with no basis published for the figure. At the EIA May 2026 residential average that would be about $18 a year, which is larger than the entire computed mowing energy cost of any machine on this page.