24V to 12V DC-DC Chargers

Charge 12V Batteries Reliably from a 24V System

A 24V to 12V DC-DC charger lets a 24V starting or house system charge a separate 12V auxiliary battery bank. It does this through a controlled, multi-stage charge profile rather than a simple voltage drop. This setup is common in trucks, buses, coaches, 24V 4WD conversions, boats and commercial or industrial vehicles that need to run 12V fridges, lighting, communications or camping gear. This collection includes Victron Orion-Tr Smart chargers in 20A and 30A ratings, the Victron Orion XS 1400 and the Enerdrive 40A+ ePower DC-DC/MPPT charger.

Choosing the Right 24V to 12V Charger

Start with your charge current. Then decide whether your installation needs electrical isolation between the 24V and 12V sides.

• Victron Orion-Tr Smart 24/12-20A Isolated: suits smaller 12V auxiliary banks and installations where the input and output circuits must remain galvanically separated.
• Victron Orion-Tr Smart 24/12-30A Isolated: provides higher charge current for larger banks and keeps the isolated design favoured in many marine and commercial installs.
• Victron Orion-Tr Smart 24/12-30A Non-isolated: delivers 30A where the 24V and 12V systems share a common negative, which is typical of many vehicle installs.
• Victron Orion XS 1400: a compact, high-output smart charger for owners wanting more charging capacity from a single unit.
• Enerdrive 40A+ ePower DC-DC/MPPT: combines DC-DC charging with an MPPT solar input, so one unit can manage both vehicle and solar charging.

If you are unsure which architecture suits your vehicle or vessel, read our guide to isolated vs non-isolated DC-DC chargers and converters before you buy.

Why Use a Smart DC-DC Charger Instead of a Converter

A basic step-down converter only supplies a fixed voltage. A smart DC-DC charger applies a staged charge profile that you can configure to match your auxiliary battery chemistry, including lithium. This helps protect battery life and supports full charging on long drives. The Victron Orion-Tr Smart and Orion XS models can be configured via Bluetooth using the VictronConnect app, which makes setup and monitoring straightforward in the field.

Need a different input voltage? Browse our 12V to 12V DC-DC chargers for standard passenger vehicles. You can also view the full 12V DC-DC charger range.

Frequently Asked Questions

Do I need an isolated 24V to 12V DC-DC charger?

Isolated models keep the 24V and 12V circuits electrically separate. Installers often choose them for boats and for systems where the negatives must not be joined. Non-isolated models suit installs with a shared negative.

Is 20A or 30A better for my auxiliary battery?

Higher current recharges a larger 12V bank faster during shorter drives. Match the charge current to your battery capacity and the manufacturer's recommended charge rate.

Can one unit handle solar as well?

Yes. The Enerdrive 40A+ ePower charger includes an MPPT solar input, which suits 4WD and touring setups with roof or portable panels.

Upgrade Your 24V Vehicle's 12V Power

Give your 12V auxiliary battery the controlled, adjustable charging it needs on every drive. Compare the Victron and Enerdrive 24V to 12V DC-DC chargers above and choose the current rating and isolation type that match your truck, boat or 4WD build.