The Victron Orion XS 12/12-70A is designed for campervans that need to put more energy back into their leisure battery while driving. With up to 70A of charging current, it offers a significant step up in alternator charging for suitable 12V systems.
But does your campervan actually need a 70A DC–DC charger?
The answer depends on your battery bank, how much power you use, how long you normally drive and what your vehicle's alternator can comfortably support.
The short answer
The Victron Orion XS 70A is best suited to higher-demand campervan electrical systems where faster alternator charging is useful.
It can make particular sense if you have a larger lithium leisure battery, regularly spend time off-grid or only drive for relatively short periods between stops.
However, 70A isn't automatically better for every van. Your battery, alternator, cabling, fuses and overall electrical system all need to support the chosen charging current.
What does the Orion XS 70A actually do?
The Orion XS sits between your vehicle's starter/alternator side and the leisure battery.
While you're driving, it takes available power from the vehicle and provides the leisure battery with a controlled charging profile suited to the battery chemistry.
This is particularly useful in modern vehicles with smart alternators, where alternator voltage can change depending on driving conditions and the vehicle's electrical demands.
Rather than simply connecting the starter and leisure batteries together, the Orion XS controls the charging current and voltage.
Why choose a 70A DC–DC charger?
The biggest advantage is the amount of energy you can potentially recover while driving.
A simple way to understand this is:
Charging current (A) × charging voltage (V) × driving time (h) ≈ energy delivered (Wh)
At around 14V, a charger delivering 70A is transferring close to 1,000W while operating near full output.
In ideal conditions, one hour of driving could therefore put considerably more energy back into the battery than a lower-current charger.
Real-world charging varies with battery state of charge, temperature, alternator behaviour, charger settings and other system conditions, but the calculation shows why higher-current charging can be useful.
Example
Imagine you've used around 1,000Wh from your leisure battery overnight.
If you're only driving for an hour the following day, a higher-output DC–DC charger gives you more opportunity to replace that energy during the journey.
For a campervan that moves regularly but doesn't spend hours on the road every day, that can be a major advantage.
Who is the Orion XS 70A best suited to?
A 70A charger starts to make more sense as your electrical demands increase.
It may suit a campervan with:
- A larger lithium leisure battery
- Regular inverter use
- A compressor fridge and multiple 12V loads
- Laptops and other devices charged frequently
- Longer periods spent away from hook-up
- Shorter driving periods between overnight stops
- Solar that needs additional support during poor weather
For a small weekend setup running lights, phones and a few basic 12V appliances, 70A charging may be more than you actually need.
The goal isn't to choose the biggest charger available. It's to choose one that matches the way you use your van.
Can your leisure battery accept 70A?
This is one of the most important checks.
A large lithium battery bank may comfortably accept a relatively high charging current, but that doesn't mean every leisure battery can.
Check the battery manufacturer's recommended and maximum charging currents before deciding on the charger.
Battery capacity alone isn't enough.
Two batteries with the same Ah rating can have different BMS limits and recommended charging rates.
Planning note: The charger's 70A rating is its maximum capability, not a requirement to charge every battery at 70A. The Orion XS allows the charging current to be configured to suit the system.
What about the alternator?
The other side of the equation is your vehicle.
A 70A DC–DC charger places a significant additional load on the alternator, so alternator capacity needs to be considered alongside existing vehicle electrical demands.
The Orion XS allows the input current to be limited, which gives the installer more control over how much power is taken from the vehicle side.
That flexibility is useful, but it doesn't remove the need to assess the alternator and vehicle electrical system properly.
Smart alternator compatibility
Many modern vans use ECU-controlled or 'smart' alternators.
Instead of maintaining a constant charging voltage whenever the engine is running, these alternators can increase and decrease their output according to vehicle conditions.
This is one reason DC–DC chargers have become such an important part of modern campervan electrical systems.
The Orion XS includes engine-running detection and is designed to provide controlled leisure-battery charging when used with compatible smart-alternator systems.
Bluetooth monitoring with VictronConnect
One of the advantages of the Orion XS range is built-in Bluetooth connectivity.
Using the VictronConnect app, you can configure the charger and view useful information about its operation without needing to access the unit physically every time.
Settings such as charging parameters and current limits can be adjusted to suit the installation.
The Orion XS also supports VE.Direct, allowing it to integrate into a wider Victron monitoring system through compatible GX equipment.
For campervans already using products such as a Cerbo GX, this can make the DC–DC charger part of a much more connected electrical system.
How does the Orion XS 70A work with solar?
They aren't alternatives to each other.
Solar and DC–DC charging are most useful under different conditions.
Solar charges the leisure battery while you're parked, provided there is enough usable sunlight.
DC–DC charging uses the vehicle's electrical system to replenish the leisure battery while you're driving.
A campervan that spends several days parked may benefit heavily from solar. A touring van that moves almost every day can make much greater use of alternator charging.
Combining the two gives you more than one way to replace the energy you use.
Do you actually need 70A?
This is the question worth answering before buying one.
Consider:
- How much energy do you normally use each day?
- What size is your leisure battery bank?
- How much charging current can the battery accept?
- How long do you normally drive each day?
- What can your alternator safely support?
- How much charging do you already get from solar?
- Do you regularly use mains hook-up?
If you have a substantial lithium battery bank and need to recover a lot of energy during relatively short journeys, the Orion XS 70A can be a very useful addition.
If you have modest power requirements and regularly have access to solar or hook-up, you may not need that much alternator charging capacity.
Build the charging system as a whole
The Victron Orion XS 70A shouldn't be chosen in isolation.
Battery capacity, alternator output, solar charging, mains charging, cable size, fuse protection and your actual daily energy consumption all affect what makes sense.
A well-balanced campervan electrical system doesn't necessarily have the biggest components. It has components that work properly together.
For suitable higher-demand systems, the Orion XS 70A provides powerful and configurable charging in a compact unit, with the monitoring and connectivity expected from Victron equipment.
Explore the Victron Orion XS 12/12-70A at Nomadic Leisure, or speak to our team if you need help matching your DC–DC charger to the rest of your campervan electrical system.
Frequently asked questions
Is a 70A DC–DC charger too big for a campervan?
Not necessarily. It depends on the leisure battery, alternator, cabling and overall system design. Some higher-demand campervans can make good use of 70A charging, while smaller systems may be better suited to a lower current.
Can I use the Orion XS 70A with a lithium battery?
Yes, when it is correctly configured and the battery manufacturer's charging requirements are followed. Always check the battery's recommended and maximum charge current.
Does the Orion XS 70A work with smart alternators?
The Orion XS is designed for controlled alternator charging and includes engine-running detection, making it suitable for appropriately configured modern vehicle systems.
Will the Orion XS 70A charge at 70A all the time?
No. Actual charging depends on the charger's configuration and operating conditions, including battery state, temperature and the available input supply.
Can I use solar and an Orion XS together?
Yes. They complement each other well. Solar can charge the battery while you're parked, while the Orion XS provides charging when the engine is running.
