24V to 48V DC-DC Chargers

Charge a 48V Battery Bank From a 24V System

A 24V to 48V DC-DC charger lets you charge a 48V house or auxiliary battery from an existing 24V supply. That supply might be a truck alternator, a 24V marine start battery or a 24V commercial vehicle system. The charger steps the voltage up and regulates the output, so you can run a 48V inverter or energy storage system without replacing the vehicle's 24V electrical system.

This collection features the Victron Orion-Tr 24/48-8.5A Isolated DC-DC Charger. It is a compact, galvanically isolated unit built for professional mobile and off-grid installations.

Why Choose an Isolated Victron Orion-Tr Charger

Isolation keeps the input and output circuits electrically separate. This helps:

• Prevent ground loops between the 24V vehicle chassis and the 48V house system.
• Reduce electrical interference on sensitive marine electronics and communications gear.
• Protect equipment by keeping faults on one side of the system from passing straight through to the other.
• Simplify compliance on boats and commercial vehicles where separate negative circuits are preferred.

For a deeper look at when isolation matters, read our guide to isolated vs non-isolated DC-DC chargers and converters.

Typical Applications

The Orion-Tr 24/48-8.5A suits setups where a 24V source needs to support a 48V battery bank. Common uses include:

• Trucks and heavy vehicles carrying 48V inverter or lithium systems.
• Marine vessels with 24V engine systems and a 48V house bank.
• Industrial, mining and service vehicles running 48V equipment.
• Off-grid builds and tiny homes that combine 24V and 48V circuits.

Sizing and Selection Tips

Start with your source voltage. This charger is designed for a nominal 24V input. If your vehicle runs on 12V, browse the 12V to 48V DC-DC chargers instead.

Next, compare the 8.5A rated output with your daily 48V energy use and the time you expect to spend driving or running the engine. Where more charging current is needed, several Orion-Tr units can be installed in parallel. Always check the alternator's available current headroom before adding chargers.

Finally, size the input cabling and fusing for the full input current. The 24V side draws considerably more current than the 48V output delivers, so undersized input cable is a common cause of voltage drop and poor charging.

Build a Reliable 24V to 48V Charging System

The Victron Orion-Tr 24/48-8.5A gives you isolated, regulated charging from a well-established power electronics range, in a form factor that fits tight installs. To compare other input voltages, see the full range of 48V DC-DC chargers. Order the Orion-Tr today to keep your 48V battery bank topped up every time your engine runs.