Electric Boat Motor Prices

The first line is the motor: NS-INB, NS-OUT, NS-SAIL, NS-STERN or NS-POD, in the chosen power step. New Stream is built in five steps. Length alone does not set the step: displacement, waterline length, hull form and wetted surface work together. A heavy gulet and a light sailing yacht of the same length need different steps; length still matters for the displacement-speed ceiling. The HP figures alongside are equivalents: they show which diesel the electric step replaces on a displacement hull at cruising speed, not a unit conversion. The ratio arises because the electric driveline is highly efficient while diesels are, in practice, always specified well oversize.

• 8 kW — 6-12 m · 1.5-14 t · 50-70 HP equivalent
• 12 kW — 6-17 m · 1.5-30 t · 75-100 HP equivalent
• 16 kW — 6-17 m · 1.5-40 t · 95-120 HP equivalent
• 20 kW — 6-24 m · 1.5-80 t · 130-170 HP equivalent
• 25 kW — 6-24 m · 1.5-80 t · 180-230 HP equivalent
• 8 / 12 / 16 kW: typical cruise 7–10 kn · 20 and 25 kW: 8–12 kn
• All direct drive — no reduction gearbox in between

This line follows the drive type. The parts match how the motor sits on the hull; a pod quote and an inboard quote are not the same here.

The control and thrust pack beside the motor. Same family on all five drive types; the difference is single or twin motors and propeller size.

• Cooled driver cabinet and motor driver
• IoT card; humidity, temperature and vibration sensors
• Emergency stop and key switch
• 7/10-inch helm display and connector
• Electronic throttle — single on one motor, dual on two
• Propeller and propeller nut; Kort nozzle where needed

This is the most variable item in the total cost. The quote is not just kWh: it includes the protection and connections that make the pack work. Capacity is driven not by an abstract range figure but by your actual consumption at your target speed.

• 16 / 24 / 48 / 72 / 96 kWh LiFePO4 unit and aluminium case
• Smart BMS — master, slave and relay
• Charge and discharge contactors, anti-spark switch
• Power socket-connector set and battery cable
• Consumption is calculated per nautical mile — ≈0.7 kWh/nm at 6 kn on 8 kW (roughly 4 kW at that speed)
• Consumption grows with the cube of speed; a single knot slower can multiply range
• Pack weight runs into hundreds of kilos — trim and stability are part of the sizing

How quickly you refill the pack is usually set not by the boat but by what the dock can supply. Solar panels, if wanted, open a separate solar line; they do not replace the pack. Regenerative charging under sail is a property of a shaft or sail drive — not a quote line, a behaviour that extends range.

• Marine charger (87.6 V, 35–200 A) — its output directly sets charging time
• Shore-charge module and shore-power marine cable
• Rough estimate: time ≈ pack kWh ÷ charger kW
• Shore power: single phase about 3.5 kW; three phase cuts the time markedly
• Optional: solar panels, MPPT and solar cable
• If range is a concern, an independent generator (range extender) can be planned

This is the layer that turns hardware into a system. Motor torque, every battery cell and the passage itself run under the same software; on the helm display the skipper sees power, discharge, remaining range and alerts — only what a decision needs. It is a separate line on the quote and is installed per drive line; on twin motors the software doubles too.

• SMCS

  Motor control

  Smart Magnetic Commanding Systems. Delivers torque to match demand in real time; no current peaks, so consumption stays linear.

• BMS

  Energy management

  Boards and software developed by Nawis engineers. Monitors the cells in real time; limits charging in the cold and switches on pre-heating when needed.

• NMACS

  Passage analytics

  Analyses cruising data in real time, catches anomalies in cruising discipline and turns them into controlled alerts.

• GET-HOME

  Get-home mode

  Continuously calculates remaining range and state of charge; below the threshold it warns you and switches to power management.

• NRDSS

  Remote monitoring Optional

  Remote access to telemetry data. Faults appear on the display with a code and description; send them to us and we diagnose remotely.

• OTA

  Remote updates

  New features and improvements are largely installed remotely while the boat is in port. Standard updates are covered by our support.

• Standard: smart cruising software and GPS location services
• Optional: telemetry data monitoring, Wi-Fi / GPRS connectivity, IoT 4.0 smart boat automation — runs the boat’s fused switching from the touchscreen
• Logged operating data simplifies warranty and diagnostic processes

Installation, commissioning and engineering are one line on the quote. Conversion or new build, work on site or not — the scope follows from that. There are also items that fall away compared with diesel: cooling circuit, seacock and exhaust.

• Installation, commissioning and engineering of the New Stream drive system
• Shaft-coupling alignment, battery placement, DC wiring and earthing
• Inboards have air cooling as extra assurance; underwater models are cooled naturally by seawater