Orion XS 12/12-50A

Victron Orion XS 12/12-50A wiring diagram

Name: Victron Orion XS 12/12-50
Brand: Victron

See how the Orion XS connects your starter and house batteries, where the fuses go, and which cable assumptions this example uses. Open the wired example and adapt it to your installation.

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Open this example as a new project. Use your own parts and cable lengths to make the plan yours.

Battery-side sizing for this example

These sizes describe the output-to-house-bank circuit. Open the editable example to inspect both battery paths and their fuses. The drawn returns share the charger's single physical GND terminal.

3 m one way

12 V system

Wire: 16 mm² · 6 AWG
Example fuse: 60 A
Design current: 50 A
Voltage drop: 2.8%

Sized against ABYC E-11. The design current is the unit's rated output. The length is one way; voltage drop includes an equal-length return.

Run-length and manufacturer assumptions

The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.

This example uses the manual's minimum cable size and a fuse within its permitted range on each battery-positive path. Those choices are pinned in the starter; review them when changing the installation. Input and output are sized at their current limits, not a prediction of simultaneous charging performance. Manufacturer installation manual

Show sizes in AWG

Wiring diagram

How the Orion XS 50A is wired.

Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.

Victron Orion XS 12/12-50 wiring diagram, 16 mm² (6 AWG) positive feed protected by a 60 A fuse and a matching negative return between the 12 V battery bank and the unit, plus IN +, IN −.50 A · 2.8% drop · ABYC E-11

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Installation notes

Connections and installation requirements.

Guidance for this model, with sources linked beside the relevant advice.

Verified against the manufacturer's documentation (rev. 11 — 06/2026), checked 2026-09-11. Manufacturer documentation →

How is the Orion XS 12/12-50A connected?

This page covers the non-isolated Orion XS 12/12-50A. In a campervan B2B installation, the starter battery feeds IN + through its battery-end fuse; OUT + charges the leisure or house bank through a second battery-end fuse. The banks and charger share a negative connection. Follow Victron's charger-mode connections, including remote on/off and battery-profile setup before enabling charging.

The diagram separates the return paths for readability. They correspond to the unit's single physical GND terminal, not two isolated negative terminals. Remote and BMS control connections are outside this starter's power-circuit drawing.

What fuse and cable size does the Orion XS require?

Section 3.3 of the manual specifies 60–70 A external battery protection and a minimum 16 mm² / 6 AWG for runs under 5 m, with a larger conductor for longer runs. These are manufacturer requirements; the fuse rating is not the input draw. The example pins a fuse within that range and the minimum conductor choice on both battery paths. Review routing, cooling and the manual's termination instructions for your installation.

The reference above describes the output-to-house-bank circuit. Open the starter to inspect both battery paths. Each positive and return run is 3.048 m (10 ft); the metric overview rounds this to 3 m. Voltage drop includes the return. The AGM source bank and 200 Ah house bank are planning placeholders: replace them with your actual batteries and cable lengths.

Does a 50 A output mean a 60 A alternator load?

No. The 50A model's technical specification gives adjustable input and output limits up to 50 A. At low input voltage, the input limit can reduce available output. Do not assume both sides deliver their maximum simultaneously.

Allow for the vehicle's own loads and alternator performance at idle when setting the input limit. Crimp sizes the starter paths at the model's ratings; it does not simulate VictronConnect limits, engine-run detection or an alternator output curve. See Victron's operating settings for detection and lockout configuration.

What belongs around the charger?

Use the lead-acid to LiFePO4 conversion guide to plan battery and charging changes together.
Add a SmartShunt 500A when planning house-bank monitoring and its return path.
Review the fuse checker for exact fuse, holder and fault-current evidence. An amp rating alone does not verify a protective device.
Read the sizing methodology for the engine's assumptions and coverage.

Explore complete campervan solar and alternator wiring or dual-battery B2B examples with this charger. The boat starter/house demo uses an Orion-Tr Smart 12/12-18. Each opens its displayed circuit in Crimp.

Use the wire size calculator to compare ampacity and voltage drop for your one-way run and installation conditions. Fuse selection remains separate.
Check DC-DC charger size and vehicle headroom using actual input voltage, efficiency and battery/BMS limits before setting charging current.

Build it out

Connect it to the rest of your system.

Add Orion XS 12/12-50A to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.

Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.

Technical reference

Specifications, terminals and supporting parts.

Check the model, ratings and connection points against your own unit before choosing installation hardware.

Catalog specification

Rated output: 50 A
Planning charge current: 50 A

Supporting parts

6 m total of 16 mm² (6 AWG) marine cable
Terminations for 16 mm² cable, matched to the equipment's screw terminals, leads or studs
60 A fuse and holder on the positive run
Heat-shrink, strain relief and terminal boots sized to the cable

Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.

Terminal map

IN + and OUT + are separate power paths. IN − and OUT − below are logical return connections to the same physical GND terminal on this non-isolated unit. The listed currents are catalog planning limits, not connector ratings. Follow the manual's physical connections and remote-control wiring.

TerminalPolarityRoleLimit

IN +

in-pos

positive · input

positiveinput50 A

IN −

in-neg

negative · input

negativeinput50 A

OUT +

out-pos

positive · output

positiveoutput50 A

OUT −

out-neg

negative · output

negativeoutput50 A

Method & provenance

Where the specifications and sizing come from.

Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.

From the maker

What the catalog says

Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.

ABYC E-11

What Crimp worked out

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 run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.

Read how the sizing works

Next step

Plan your installation with Orion XS 50A.

Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.