CrimpVictron Orion XS 12/12-50
Non-isolated 50A DC-DC charger with high efficiency.
Open in Crimp →
A sizing result with its assumptions attached.
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 design current is the unit's rated output. 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.
The part the engine actually sees.
- Rated output
- 50 A
- Typical charge current
- 48 A
Terminal map
| Terminal | Polarity | Direction | Rating |
|---|---|---|---|
| IN + | positive | input | 70 A |
| IN − | negative | input | 70 A |
| OUT + | positive | output | 50 A |
| OUT − | negative | output | 50 A |
What belongs around it.
- 6 m total of 16 mm² (6 AWG) marine cable
- Four 16 mm² cable lugs matched to the equipment studs
- 70 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.
Researched notes on the real installation.
What it does
Charges a house battery from the vehicle's alternator circuit at up to 50 A, with input and output current limits you set in VictronConnect. It is non-isolated (input and output share a negative), and at around 98.5% efficiency it runs without a fan.
Wiring it
The input side comes from the starter battery or alternator feed; the output side goes to the house bank. Both legs carry real current, so both get sized and fused — not just the output. Engine-run detection works from the input voltage, so no ignition-trigger wire is required in the common case.
What people get wrong
Sizing the input wiring for the 50 A output. A DC-DC charger is not lossless and its input voltage can sit below its output voltage while charging, so the input side draws more than 50 A — around 60 A at full load. Victron's manual calls for a 60–70 A fuse on the input; an input leg wired at 50 A runs hot and nuisance-blows.
Supporting parts
- Fuses on both legs, at the battery end of each run — the input per the manual's 60–70 A recommendation
- Cable lugs matched to the unit's terminals and the fuse holders
- A negative return sized like the positive runs — non-isolated does not mean current-free
Verified against the manufacturer's datasheet, checked 2026-08-01. Manufacturer datasheet →
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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