Orion XS 12/12-50A
Victron Orion XS 12/12-50A wiring diagram
Charge your house battery from the vehicle with the Orion XS 12/12-50A. See both battery fuses and the shared ground, then check cable sizes, charging settings and reverse-charge questions.
- Rated output
- 50 A
Connection essentials
Starter bank → IN+
Protect the positive supply at the starter battery. Set the input limit for the vehicle’s available charging capacity.
OUT+ → house bank
Protect this positive at the house battery too. Select its charging profile before enabling the charger.
One shared GND
Both banks share the charger’s single physical GND terminal. The diagram separates return paths for readability.
Wiring diagram
How the Orion XS 50A is wired.
Starter bank → charger → house bank. The two drawn returns connect to one physical GND terminal; remote and BMS controls are not shown.
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
Edit this wiring exampleBattery-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
Supporting parts
- 6.1 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.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. 12 — 09/2026), checked 2026-10-11. 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.
Can the Orion XS 12/12-50A reverse charge the starter battery?
Yes. Victron's 24 September 2026 firmware release added emergency reverse charging with Orion XS firmware 1.15 and VictronConnect 6.43 or later. Start it from the app's engine icon to transfer energy from the auxiliary battery to the starter battery for 15 minutes, followed by a five-minute settling period for starting the engine.
The 50A model's specification limits reverse charging to 25 A, or the lowest configured input/output limit if lower. This is a manually started emergency cycle; it does not provide continuous automatic starter-battery maintenance from house-bank solar.
Why is the Orion XS 12/12-50A reverse-charge button greyed out?
The charger must be in charger mode and stopped because input-voltage lockout is active or engine-shutdown detection has detected a stopped engine. Remote-off does not prevent reverse charging, but remote-off alone does not satisfy those start conditions. Power-supply mode and active forward charging also prevent it.
If the button is entirely missing, check the firmware and app versions. Victron's troubleshooting section distinguishes a missing control from a disabled one.
What should I check before emergency reverse charging?
Check the whole charging system before using emergency reverse charge.
- With parallel Orion XS units, start reverse charging on all units or switch the others off first. A unit left in normal operation can charge forward against the reversing unit, circulating current between them. Follow Victron's parallel-unit precautions.
- Battery ready means the 15-minute charge has finished; it does not guarantee the engine will crank. Battery condition and cable voltage drop can limit the energy transferred. See reverse-charge troubleshooting.
- Crimp's starter diagram and technical reference model normal forward charging. The emergency reverse-charge cycle is not simulated.
What do owners and installers say about the Orion XS 12/12-50A?
In a September 2026 Victron Community discussion, an owner reported a greyed-out button on remote-controlled units and said enabling engine-shutdown detection made it work. That is one installation report; the current manual's start conditions below govern troubleshooting.
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.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
Non-isolated 50A DC-DC charger with high efficiency.
- Rated output
- 50 A
- Planning charge current
- 50 A
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.
IN +
positive · input
IN −
negative · input
OUT +
positive · output
OUT −
negative · output
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with Orion XS 50A.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
Free for up to 10 equipment components, with no account needed. Cables, busbars and fuse hardware do not count toward the limit. Your drawing saves in this browser. File exports are included with Crimp Pro.