Electric Boat Costs vs. Gas: My Real Break-Even Numbers
What do electric boat costs really look like vs. gas? My real ePropulsion vs. petrol outboard breakdown, with an honest break-even calculation.
TL;DR
- The costs for the electric boat motor I bought are €2,549 (ePropulsion Spirit 1.0 Evo). €850 more upfront than the sailboat-specific petrol outboard I compared it against (Tohatsu MFS 6 Sail Pro, €1,699).
- At my actual usage (roughly 70 motor hours per season) that premium pays itself back in about 4 years with DIY maintenance, or just over 3 years against a workshop-serviced Tohatsu.
- Annual running cost of the electric motor: around €7. The petrol equivalent: around €221 per year in fuel and maintenance. That gap is what drives the numbers.
The two motors I’m comparing
Electric boat costs are easiest to understand by comparing two real motors and real prices rather than hypothetical averages. So that is what I did with my own purchase and after wondering at which point I would break even. Because intuitively, ongoing higher gas costs should naturally lead to a break even point at some time.
The ePropulsion Spirit 1.0 Evo is a 1 kW motor, roughly 3 HP equivalent, that ships with a 1.2 kWh lithium battery. I paid €2,549.
On the petrol side I chose the Tohatsu MFS 6 D SLSP Sail Pro at €1,699. Even if comparing 3 HP to 6 HP seems like comparing apples to oranges, this choice is deliberate. The 4, 5, and 6 HP versions of a lot of outboard motors share the same block and housing, so the 6 HP delivers meaningfully more power without adding meaningful weight. More importantly, the Sail Pro version comes with a propeller tuned for sailboat use (good low-speed thrust, usable reverse in tight spaces) which is not something every outboard gives you. That is the motor I would actually buy for a sailboat. A cheaper 4 HP generic outboard would give worse real-world performance and its not what I would have bought.
So: €2,549 versus €1,699. An €850 premium for electric, upfront.
Every cost line: my electric boat motor
Purchase price: €2,549. After that, the running costs are modest.
I live in Germany where household electricity runs around €0.35 per kWh. My battery holds 1.2 kWh, so a full charge costs about 42 cents. At around 70 motor hours per season, drawing around 300 W per hour in real use, the annual electricity bill comes to about €7.35.
Maintenance: none. No oil to change, no impeller to replace, no gear oil, no fuel to stabilise over winter. The motor goes in the water, it runs, it comes out. That is not optimism about electric reliability. It is just how brushless motors work: no combustion byproducts, no raw-water cooling pump. Simply less moving parts.
Every cost line: petrol outboard
Purchase price: €1,699.
The Tohatsu ships with a 12-litre external tank. At an average consumption of around 1.2 litres per hour under sailing-auxiliary conditions (motoring in and out of the marina, pushing through a flat patch, dropping anchor), 70 hours of use per season means about 84 litres per year. At the current Berlin Super E5 price of €2.04 per litre, that is around €171 in fuel: roughly seven tank fills at €24.48 each.
Maintenance on a four-stroke outboard this size, done yourself:
- Impeller replacement once a season: €25 in parts and shipping
- Engine and Gear oil change: €10–15
- Spark plug: around €6 amortised over two seasons
- Fuel stabiliser and winterising: €9
That is roughly €50 per year in parts for DIY maintenance. Since all this maintenance is fairly quick to do if you have some experience, I doubt that a workshop doing this inflates the price to a lot more than 2x this amount. I’ll roughly estimate the maintenance costs around €125 if a marina workshop handles it. I actually lack experience here, I have always DIYed it
Annual totals: €221 all-in if you do it yourself, €296 if a workshop does it. Fuel plus maintenance, nothing else.
So where’s the break-even?
My electric motor costs around €7 per year to run. The equivalent petrol motor would cost €221–296 per year. The annual saving is roughly €214 (DIY) or €289 (workshop-serviced).
The upfront premium to recover: €850.
- €850 ÷ €214 per year = 4.0 years against a self-maintained Tohatsu
- €850 ÷ €289 per year = 3.0 years against a workshop-serviced one
After that point the electric motor is saving me over €200 per year compared to what I would otherwise be spending.
The two inputs that move these numbers most for a different situation: how hard you push the throttle (higher fuel consumption closes the gap faster), and whether you service the petrol motor yourself or pay a workshop.
Running hours are the biggest lever
The numbers above reflect my actual sailing: mostly under sail, motor on for an hour per outing. That gives me roughly 70 motor hours per season, with break-even at around 4 years.
To see how usage changes the break even point, we can run the numbers for a hypothetical scenario: Take a similar-sized motorboat: same 6 HP outboard, same pattern of two outings a week over a 35-week season, but motoring for three hours each time instead of one. That is 210 motor hours per year.
For the petrol motor, fuel at 1.2 L/h now comes to around 252 litres per year. That is roughly €514 in fuel, plus the same annual maintenance of around €50. Total: around €564 per year.
For the electric motor, 210 hours at 300 W costs around €22 per year in electricity.
Annual saving: around €542. Against the same €850 premium, break-even drops to roughly 1.6 years.
The upfront premium is fixed. The annual saving scales with every hour you run the motor. That is why the break-even question is really a question about how you use your boat.
What about a solar panel?
ePropulsion makes a solar charging kit: a charge controller at around €140–150 and a compatible 100–180 W panel at €150–300, so roughly €300–450 all-in. I have been thinking about it.
The electricity-savings case is weak at my usage level. My entire annual energy bill is around €7–9. No solar investment pays back on electricity savings when the baseline bill is that small.
Where solar does make sense is charging independence: staying at anchor without shore power access and keeping the battery topped up. Extending the range while using the motor or sailing around. Useful, but not a cost argument. It is a comfort and range argument. To learn about electric boat range you can read my guide. If you want to run the numbers for your own boat and check how far you’d go with an electric motor try the range calculator.
What I’d tell someone deciding between the two
If you sail more than you motor (which is true for most sailors who buy an electric auxiliary), the financial case for electric is real but medium-term, not immediate. At my usage level the break-even is somewhere between 3 and 4 years. If you choose to buy non electric check if the 4, 5 and 6 HP versions share the same engine housing. If you have the money you can buy bigger safety reserves for days with heavy currents without weighing your boat down.
Beyond the spreadsheet: the electric motor is quieter, there is no fuel that smells and that needs stabilizing over winter. Electric motors start every time with the push of a button. Those differences do not show up in a break-even calculation but they show up on every sail.
If you run your motor far more than a couple of hours a week, the economics tip towards electric faster. If you motor rarely and the €850 premium is a real stretch, the petrol motor is the rational short-term choice. That is a fine conclusion to reach.
To see how range translates to your specific boat and route, the range calculator is built for exactly that. For matching the right motor power to your hull in the first place, see how to size an electric boat motor.