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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A sizing result with its assumptions attached.
Sized against ABYC E-11 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. 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 9.8 ft one-way run is a stated reference, not a universal installation prescription.
The part the engine actually sees.
- 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 belongs around it.
- 19.7 ft total of 4/0 AWG (120 mm²) marine cable
- Four 4/0 AWG 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
See what it changes in your system
With JavaScript enabled, describe your existing boat, van, or off-grid system here. The model supplies topology; Crimp's engine computes the attachment, resized runs, checks, and supporting basket.
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 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. 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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