How Much Electricity Does a Robot Mower Use? (Cost Calculator)

MA MowAutonomous Editorial Team · Updated 2026-06-23 · 10 min read

One of the big selling points of robot mowers is that they're cheaper to operate than gas mowers. But how much electricity do they actually use, and what does it cost? The short answer: very little — typically $20-$50 per year for an average lawn. This guide breaks down the math.

The Math: How Much Electricity Does a Robot Mower Use?

Let's do the math. A typical wire-free robot mower has a 300-500 Wh battery and runs about 6 hours per week during growing season (April-October, roughly 30 weeks). That's 1.8-3.0 kWh per week, or 54-90 kWh per growing season. At the US average electricity rate of $0.16 per kWh, that's $8.64-$14.40 per growing season in electricity costs. Add a few dollars for winter storage trickle charging, and you're looking at $10-$20 per year total.

Robot Mower vs Gas Mower Operating Cost

Compare that to a gas mower: a typical 21-inch push mower uses about 0.5 gallons of gas per hour, and most homeowners mow 1-2 hours per week during growing season. That's 0.5-1.0 gallons per week, or 15-30 gallons per growing season. At $3.50 per gallon (2026 average), that's $52.50-$105 per growing season in gas — plus oil changes, spark plugs, and air filter replacements. A robot mower saves the average homeowner $40-$85 per year in operating costs.

Electricity Usage by Mower Model

Electricity usage varies by mower model based on battery size and runtime: (1) Segway Navimow i105N (150 Wh battery, 180 min runtime): about 0.5 kWh per session. (2) Segway Navimow i110N (150 Wh battery, 180 min runtime): about 0.5 kWh per session. (3) Mammotion LUBA 2 AWD 3000X (480 Wh battery, 270 min runtime): about 0.6 kWh per session. (4) Mammotion LUBA 2 AWD 10000H (720 Wh battery, 360 min runtime): about 0.9 kWh per session. (5) Segway Navimow X450 (360 Wh battery, 300 min runtime): about 0.5 kWh per session.

Electricity Usage by Lawn Size

Electricity usage scales roughly with lawn size: (1) 1/4 acre lawn: about 60 kWh per year ($9.60 at $0.16/kWh). (2) 1/2 acre lawn: about 100 kWh per year ($16). (3) 1 acre lawn: about 180 kWh per year ($28.80). (4) 2 acres: about 350 kWh per year ($56). These are rough estimates — actual usage depends on your mower, your grass type, and your mowing frequency.

Hidden Costs: What Else Should You Budget For?

Beyond electricity, the main ongoing costs of robot mower ownership are: (1) Replacement blades: $15-$40 per set, replaced every 1-3 months. Budget $60-$200 per year. (2) Battery replacement: every 5-8 years, $150-$400. Budget $25-$60 per year. (3) Mower garage (one-time): $100-$300. (4) GPS tracker subscription (if applicable): $30-$50 per year. (5) Occasional repairs: budget $50-$100 per year. Total ongoing cost: about $150-$400 per year, plus electricity.

Can You Power a Robot Mower with Solar?

Yes — several manufacturers offer solar charging options for their mowers. Segway Navimow, Mammotion, and Worx all sell solar panel kits that can charge the mower's battery during the day. A typical 50W solar panel can fully charge a 300 Wh battery in 6-8 hours of direct sunlight. Solar charging is most cost-effective in sunny climates (US Southwest, Australia, Southern Europe) where the panel can generate meaningful power year-round.