CrimpComponent folio · Engine · Yanmar
3YM30
Yanmar 3YM30 — 29 HP / 21.3 kW @ 3600 RPM, 3-cyl 1115 cc. 1.4 kW starter cranks at ~150 A (300 A inrush); 60 A internally regulated alternator. Among the most common modern small sailboat auxiliaries.
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Engine 29HP — Yanmar 3YM30 · 3 terminals
01 — Reference run
A sizing result with its assumptions attached.
Conductor120 mm²4/0 AWG
Fuse350 Apositive run
Voltage drop1.8%3 m one way
Design current250 A12 V system
The Crimp engine applies its ordinary continuous-load headroom, voltage-drop budget, terminal clamp, and standard fuse ladder. The 3 m one-way run is a stated reference, not a universal installation prescription.
02 — Catalog specification
The part the engine actually sees.
- Continuous draw
- 250 A
- Rated output
- 60 A
- Surge current
- 350 A
- Canvas footprint
- 220 × 130 px
Terminal map
| Terminal | Polarity | Direction | Rating |
|---|---|---|---|
| Starter | positive | input | 500 A |
| Alt B+ | positive | output | 200 A |
| Block GND | ground | bidi | 500 A |
03 — Supporting parts
What belongs around it.
- 6 m total of 120 mm² (4/0 AWG) marine cable
- Four 120 mm² cable lugs matched to the equipment studs
- 350 A fuse and holder on the positive run
- 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.