11A to 20A DC-DC Chargers

Mid-Range 11A to 20A DC-DC Chargers for Dual Battery Systems

This collection groups Victron Orion-Tr DC-DC chargers rated between 12A and 20A. These models suit auxiliary and house batteries that need more charging current than a compact unit provides, without the size or cabling demands of a high-output charger. It covers 12V to 12V, 12V to 24V, 24V to 24V, 24V to 12V, 48V to 24V and 48V to 12V conversion. You can match a 20A DC-DC charger or a lower-rated unit to your vehicle's alternator and your battery bank's voltage.

Models in This Range

• 12V to 12V: Orion-Tr Smart 12/12-18A Isolated, for caravan, 4WD and camper dual battery setups
• 12V to 24V: Orion-Tr Smart 12/24-15A, available in isolated and non-isolated versions, for charging a 24V bank from a 12V vehicle
• 24V to 24V: Orion-Tr Smart 24/24-12A Isolated, plus the 24/24-17A in isolated and non-isolated versions, for trucks and 24V vessels
• 24V to 12V: Orion-Tr Smart 24/12-20A Isolated, for running or charging 12V circuits from a 24V start system
• 48V to 24V: Orion-Tr 48/24-16A Isolated, for 48V house systems supplying 24V equipment
• 48V to 12V: Orion-Tr Smart 48/12-20A Isolated (240W), for 12V loads and batteries in 48V off-grid and marine installs

Choosing the Right Current Rating and Voltage

Start with your input (source) voltage and your output (battery) voltage. Then choose a current rating that suits your battery capacity and alternator headroom. Chargers in the 11A to 20A band are a practical middle ground for many lithium and lead-acid auxiliary batteries. They deliver meaningful recharge during regular driving while keeping cable sizes and alternator load moderate. If you run a large lithium bank or have short daily drive times, compare these with our 31A+ DC-DC chargers.

The Smart models in the Orion-Tr range can be configured over Bluetooth using the VictronConnect app. This makes it easier to set charge parameters for your battery chemistry and to monitor operation without extra hardware.

Isolated vs Non-Isolated Models

Most chargers in this range are isolated. Isolated units separate the input and output electrically, which helps protect sensitive electronics and suits systems where the start and house circuits should not share a common negative. That is common in marine and some commercial installs. Non-isolated versions of the 12/24-15A and 24/24-17A suit vehicles and caravans with a shared ground. For a detailed explanation, read our guide to isolated vs non-isolated DC-DC chargers, or browse the full isolated DC-DC charger range.

Common Use Cases

• Caravans and 4WDs: 12V to 12V charging of a house battery from a smart alternator while touring
• Trucks and buses: 24V to 24V auxiliary charging, or 24V to 12V supply for 12V accessories and fridges
• Boats and marine: isolated charging between start and house banks, or 12V to 24V for 24V thrusters and equipment
• Off-grid and tiny homes: 48V to 12V or 48V to 24V conversion to run lower-voltage loads from a 48V battery system
• Commercial and industrial vehicles: reliable auxiliary power for tools, lighting and communications gear

Pick the Victron Orion-Tr model that matches your input and output voltages to get consistent, multi-stage charging from your alternator or main battery. Compare the models above and add the right 11A to 20A DC-DC charger to your cart to protect your batteries on every trip.