35 ft sailboat
Repower sizing guide

35-foot sailboat electric repower

Mid-size cruisers around 6–8 t — the most common repower target on the market.

Start sizing this boatPre-filled with realistic defaults
Fits boats like
Beneteau Oceanis 35Bavaria 34Hallberg-Rassy 34Jeanneau Sun Odyssey 36Dufour 34Hanse 345Najad 343Westerly Oceanlord

Not an exact match? The wizard adjusts to your real numbers — these are reference hulls for the typical sizing.

15–20 kW
Continuous power
18–28 kWh
Battery pack
180–250 A @ 48 V
DC current
25–45 nm
Cruise range
What this replaces — vs a 35 hp diesel
At 50 h motored per season (typical cruiser). Slider on the full summary lets you adjust.
Diesel displaced
199 L
per season
CO₂ avoided
533 kg
per season
Quieter
−23 dB
52 vs 75 dB(A)

What this segment looks like

Why a 35 ft sailboat is a sensible repower target

Mid-size cruisers in the 33–37 ft range — Bavaria 34, Beneteau Oceanis 35, Hallberg-Rassy 34 — typically displace 6–8 tonnes and need 15–20 kW continuous to make 5.5–6 kn under power. This is the most common repower target we see.

  • 15 kW continuous matches a 19–27 hp diesel one-for-one on most 35-footers.
  • 48 V works but cable runs get tight — consider 96 V if your motor supports it.
  • 20+ kWh of LiFePO4 typically replaces the diesel + tank weight, keeping CG neutral.
  • Dedicated 3.5 kW shore charger gives you a full pack overnight on standard 16 A AC.
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Frequently asked questions

35 ft sailboat — common questions

Quick answers to what most owners ask before starting a repower.

How many kW does a 35-foot sailboat need?+
For 6–8 tonnes at 5.5–6 kn target speed, 15 kW continuous is the right baseline; 20 kW gives reserve for headwinds, current, and short pushes to hull speed. This matches the existing 19–27 hp diesel one-for-one.
How much battery capacity is realistic for a 35 ft cruiser?+
20–28 kWh of LiFePO4 is the sweet spot — gives 1.5–2 hours of motoring at cruise speed with reserve, and the pack typically replaces the diesel + tank weight without changing the boat's centre of gravity.
Should I go 48 V or 96 V on a 35 ft boat?+
Both work. 48 V is simpler and cheaper but cable runs get tight at 20 kW (250+ A). 96 V halves the current and is worth the small premium if you want headroom or longer cable runs to the bow battery bank.
How long does it take to charge a 25 kWh pack?+
From a 3.5 kW shore charger, around 7–8 hours from empty to full — overnight on a standard 16 A AC marina connection. A 7 kW charger halves that if your shore supply allows.
Will the boat still sail well after repower?+
Yes — usually better. The pack and motor combined are typically 50–150 kg lighter than the diesel + tank + exhaust system, so trim and stability improve marginally.
Other segments

Different boat?

30 ft sailboat40 ft sailboat40 ft catamaranElectric launchTrawler yacht

Size your 35 ft sailboat now

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