Size your electric boat propulsion system in minutes
Enter your boat's dimensions, target speed, and range — get battery kWh, DC & phase currents, and a professional spec sheet ready for any installer or supplier.
What makes it useful
Built for real electric boat projects
Monohull or multihull, shaft drive or saildrive — sized from your real LWL and displacement.
Speed vs power curve shows how close you are to hull speed and available headroom.
DC current, phase RMS, pack kWh, and Ah — exactly what installers and suppliers need.
Who uses it
Who is this for?
Planning a diesel-to-electric repower? Get credible numbers before talking to any installer.
Understand what current, cable size, and battery capacity you actually need before buying.
Use Installer mode for conservative continuous ratings and a shareable spec to vendors.
Works for any electric auxiliary or hybrid setup, not just full repowers.
Deliverables
What you get
Every output is backed by the math — formulas shown inline. Free to run; buy the PDF when you're ready to share with suppliers.
- Battery voltage, kWh & Ah sizing
- DC and phase current (RMS + peak)
- Power bucket recommendation
- Estimated charging time
- DC voltage drop & cable sizing
- 48V vs 96V bus voltage comparison
- Downloadable PDF spec sheet
Run the wizard free — pay only when you're ready to download.
No account needed · pay only for the PDF
kWh, Ah, and runtime from your DoD and reserve assumptions.
DC continuous, DC peak (10 s / 30 s), and phase RMS + peak.
Copy as plain text or buy a formatted PDF to share with vendors.
Ready to size your build?
Takes ~10 minutes. No signup. Professional output.