CrimpEngine 27HP — Westerbeke 30B Three
Westerbeke 30B Three — 27 HP / 20 kW @ 3000 RPM, 3-cyl 1.0 L (Mitsubishi-based). 1.4 kW starter cranks at ~150 A (300 A inrush); 50 A standard alternator (105 A optional). Common in older US-built sailboats.
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How the 30B Three 27HP is wired
The run drawn here is the 3 m reference run sized below. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Confirm your own run length, routing and terminations before ordering — open this part in the designer to size it against your actual system.
What size cable and fuse does the 30B Three 27HP need?
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The cranking current is the starter's continuous draw. ABYC E-11 excepts cranking-motor conductors from overcurrent protection, so the fuse shown is the conventional cranking-rated (Class T) choice sized to hold the draw without nuisance tripping — not a wire-protection requirement. The conductor is sized by the Crimp engine for the cranking draw and voltage drop. The 3 m one-way run is a stated reference, not a universal installation prescription.
Engine 27HP — Westerbeke 30B Three specifications and terminal map
- Continuous draw
- 150 A
- Rated output
- 50 A
- Surge current
- 280 A
Terminal map
| Terminal | Polarity | Direction | Rating |
|---|---|---|---|
| Starter | positive | input | 500 A |
| Alt B+ | positive | output | 200 A |
| Block GND | ground | bidi | 500 A |
What else you need to wire the 30B Three 27HP
- 6 m total of 120 mm² (4/0 AWG) marine cable
- Four 120 mm² cable lugs matched to the equipment studs
- 250 A cranking-rated (Class T) fuse at the battery
- Heat-shrink, strain relief, and terminal boots sized to the cable
Start from this part
Open the canvas with the 30B Three 27HP already placed, then wire the rest of the system around it. Nothing to install and no sign-up — the project is saved in this browser, and you can download the file whenever you want it.
What is known, assumed, and computed.
Catalog profile
The manufacturer, model, ratings and terminal map are maintained as planning data in Crimp's component catalog. Confirm the current manufacturer manual, exact revision and installed nameplate before ordering or wiring.
Engine reference
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The published conductor, fuse and voltage-drop result uses the visible reference length and current basis; it is not a universal installation prescription.
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