Electric boat repower cost: what to budget in 2026

The most common mistake in electric boat repower planning is budgeting for the motor and battery, then discovering that the supporting components — controller, charger, BMS, cables, fusing, monitoring — often cost as much again.

This guide gives a realistic component-by-component breakdown for a typical auxiliary sailboat repower in the 10–20 kW range, based on European retail pricing as of mid-2026.

Three things shifted in 2026 that the older versions of this guide don't reflect, and you should plan around:

LiFePO₄ pack pricing dropped roughly 15–25% versus 2024 levels, driven by overcapacity at major cell manufacturers (CATL, EVE, BYD-grade prismatics). Pricing below assumes mid-2026 retail.
Grant and incentive programmes remain a patchwork. There is no EU-wide electric repower subsidy. National, regional, and municipal schemes exist, differ sharply in eligibility, and change on their own timetables — so the net price for two identical boats in two countries can differ substantially. Check with your own national authority or harbour administration rather than budgeting against a figure quoted second-hand.
Insurer and surveyor expectations tightened. Compliance work that owners used to skip — documented isolation, accessible disconnects, a BMS that retains fault state — is increasingly what underwriters ask to see. It is a modest cost line, but it is no longer optional in practice.

This post focuses on the cost figures themselves.

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Quick summary: what a complete repower actually costs

For a 35–40 ft sailboat targeting 5.5 knots, expect:

Budget tier	What you get	Installed range
Entry (DIY)	Component-sourced, self-installed	€10,000–15,000
Mid (partial install)	Good components, professional install	€19,000–28,000
Premium (turnkey)	Integrated system (e.g. Torqeedo Deep Blue or Cruise Pod), fully installed	€34,000–50,000

These are retail-pricing estimates, not quotes — component pricing moves, and yard labour rates vary by a factor of two across Europe. Where a local grant programme applies it can reduce the mid and premium tiers materially, but eligibility rules differ enough by country that any net figure has to come from your own authority rather than from a table like this one. DIY installs are frequently excluded from such programmes entirely.

These are installed costs including battery, motor, controller, charger, monitoring, cables, and yard labour. They exclude any structural work, new battery-box construction, or replacement of associated systems (windlass, galley, etc.).

Component-by-component breakdown

Motor and motor controller

For a 10–25 kW continuous system, expect:

OceanVolt ServoProp AV 20 kW: €9,500–11,000 (motor + controller, excluding battery)
Torqeedo Deep Blue 25R saildrive: €12,000–15,000
Torqeedo Cruise 25R Pod (new in 2026): ~€18,500 installed, excluding battery — bolt-in single-package alternative to Deep Blue with materially easier cable sizing (peak 580 Arms vs Deep Blue 50R's 1,040 A)
E-Tech or Bellmarine inboard 15 kW: €6,000–9,000

Note: "motor price" almost always means motor + controller as a matched pair. Using a third-party motor controller with a manufacturer's motor typically voids the warranty and creates integration complexity. For a full comparison of motor + controller pairings, see the motor and controller selection guide.

Battery pack

The single largest cost in most repowers, though prices dropped meaningfully through 2025 and into 2026 as cell-manufacturer capacity caught up with demand. LiFePO₄ pricing as of mid-2026:

DIY prismatic cells (CATL/EVE/BYD-grade): €80–110/kWh for cells alone (~15% below 2024)
Pre-assembled marine pack (BMS included): €300–450/kWh installed (~20% below 2024)
Manufacturer-matched pack (e.g. Torqeedo): €450–650/kWh

For a 24 kWh pack (typical for a 35 ft boat with 3-hour range at 5 kn):

DIY cells only: ~€2,000–2,650 (add BMS, enclosure, wiring: ~€1,500–2,500 more)
Pre-assembled marine pack: €7,200–10,800
Manufacturer-matched: €10,800–15,600

The chemistry decision matters for cost AND insurance — NMC packs are cheaper per kWh on the cell market but carry a 20–35% insurance surcharge versus LFP at most European underwriters. The LiFePO₄ battery marine guide covers the chemistry trade-offs in detail.

On-board charger

A 7–11 kW single-phase AC charger for 48 V:

Victron MultiPlus-II 48/5000: €1,800–2,200 (includes inverter)
Mastervolt ChargeMaster 48/25: €900–1,200 (charger only)
Manufacturer-matched charger: typically bundled or €1,500–3,000

BMS

If not included in the battery pack:

REC Active BMS (16S): €350–450
Victron Lynx Smart BMS: €500–650
Orion BMS 2: €600–900
Batrium Watchmon Core: €700–1,000

All four units retain fault and event state across a power cycle. Cheaper generic CAN-bus BMSs that lose state on power-cycle do not — which matters because a surveyor or underwriter investigating an incident will ask what the BMS recorded, and "nothing" is an expensive answer.

Monitoring and display

Victron Cerbo GX + 7" touch display: €600–800
Torqeedo TorqTrac display: included in Deep Blue system
OceanVolt Energy Management unit: ~€800

Cables, fusing, and contactor

Often under-estimated. For a complete main circuit:

8–10 m of 70–95 mm² tinned marine cable (+ and −): €400–700
Class T fuse + holder (250–400 A): €90–170
Main DC contactor (e.g. Gigavac GX14): €150–250
Pre-charge circuit: €50–100
Terminal lugs and crimping: €100–200

Subtotal cables/protection: €800–1,400

Installation labour

The most variable cost and the one most often omitted from online budget estimates:

Saildrive swap (straightforward hull): 15–25 hours
Inboard shaft drive (simple swap): 20–30 hours
Complex routing, battery-box fabrication, new panel: 40–60 hours

At a European boatyard rate of €80–120/hour, installation labour alone runs €2,000–7,200 for most repowers.

What drives total cost above the estimate

Battery-box fabrication. If the boat doesn't have a suitable existing compartment for the battery (correct size, above waterline, ventilated), a custom fibreglass or aluminium box must be built. Budget €800–2,500.

Electrical panel upgrade. Many older boats have undersized DC panels that cannot accommodate the shore-power and charging loads of a new system. A full panel replacement costs €1,500–3,500 installed.

Prop replacement. The optimal propeller for electric drive (lower pitch, larger diameter, slower turning) differs from a typical diesel prop. A new folding or feathering prop sized for electric: €800–2,500.

Sea trial and commissioning. A reputable installer will charge 3–5 hours for commissioning, sea trial, and handover documentation. Budget €300–600.

Compliance fittings. Plan for these from day one rather than retrofitting them — ABYC E-30 and IEC 60092-507 both point in this direction, and insurers increasingly ask for them. Three small line items: dual-location emergency disconnect (€200–500 in switchgear plus a few hours of labour), isolation monitoring for systems above 60 V DC (€400–900 for a Bender ISOMETER or equivalent), and a BMS that supports non-volatile event logging (no extra cost if specified upfront, ~€800–1,500 to swap if you already bought a non-compliant unit). Total: €600–1,400 added to a new install, €1,400–2,900 to retrofit an older one.

Post-subsidy net cost — what European buyers actually pay

For repowers completed by an approved integrator in one of the 14 participating EU member states, the subsidy meaningfully reduces the net price. The math is mechanical: 35 % of eligible cost, capped at €15,000 per vessel. Eligible costs are propulsion-side only — motor, controller, BMS, propulsion-only battery, on-board charger, propulsion cabling, and certified install labour. House batteries, hotel-load inverters, solar panels, and unrelated upgrades don't count.

Worked example for the mid-tier 35–40 ft sailboat repower priced at €25,000 gross above:

Eligible cost portion (propulsion-side only): ~€23,000
35 % × €23,000 = €8,050 subsidy paid
Owner net outlay: ~€16,950

For the premium-tier €45,000 turnkey install:

Eligible cost portion: ~€42,000
35 % × €42,000 = €14,700 — under the €15,000 cap
Owner net outlay: ~€30,300

The subsidy closes most of the previous cost gap to a like-for-like diesel rebuild. For the first time at this scale, a turnkey electric repower on a mid-size cruiser is within ~€5,000 of a comparable diesel rebuild on a financial basis alone.

DIY component sourcing can still be cheaper in absolute terms, but DIY installs typically don't qualify for the subsidy because the scheme requires a pre-registered approved integrator. The cost arithmetic is genuinely close — see the next section.

DIY vs professional installation: the real trade-off

DIY component sourcing can save €8,000–15,000 on a mid-range repower. A rough comparison for a mid-tier €25,000 install:

DIY route: ~€12,000
Professional install: ~€25,000

That gap buys a documented install, warranty pass-through, insurance paperwork, and no fabrication weekends lost. It also narrows wherever a local grant programme applies, because most such programmes require an approved installer and exclude self-installed work — which is worth checking before you assume DIY is the cheaper path.

The full trade-off:

Time: expect 150–300 hours for a first-time electric repower, including research, component specification, fabrication, and commissioning.
Risk: a wiring error in a 48 V propulsion system can damage the motor controller (€3,000–6,000 to replace) or start a fire. DIY does not mean unchecked — have the electrical work inspected by a certified marine electrician before sea trials. The DC safety guide covers what an inspection should look for.
Insurance: many underwriters now ask for certified-installer documentation before granting all-risks cover on an electric propulsion install, and policies differ — ask your own insurer before you start, not after. Retrospective certification of a DIY install is usually possible but costs money and may identify items requiring rework.
Grants: where an incentive programme exists, it will typically require an approved installer, so DIY work is often ineligible.

Five-year total cost of ownership vs diesel

A diesel auxiliary refit (new engine + installation) typically costs €8,000–18,000. But operating costs favour electric decisively, using the same constants the site's diesel-vs-electric savings calculator applies:

Diesel fuel at €1.80/L, 100 engine hours/year: ~€575–820/year (depends on duty cycle)
Electric equivalent at €0.30/kWh shore power: €100–180/year
Diesel servicing (annual + 500h): €400–800/year
Electric servicing (annual inspection): €100–200/year

Over five years, the running cost advantage of electric is approximately €4,500–7,500 — closing a meaningful portion of the upfront cost gap, though rarely all of it on its own. Whether the total position crosses break-even inside five years depends heavily on how many hours you motor, what you pay for fuel and shore power, and whether any local incentive applies. The payback calculator lets you run it on your own numbers.

For the per-season replacement math (diesel litres displaced, CO₂ avoided, maintenance saved), the diesel-vs-electric savings calculator runs it interactively with your own hours.

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