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The Orion-Tr Smart 12/12-18A isolated DC-DC charger is Victron's professional solution to charging a 12V auxiliary or leisure battery from your engine's 12V alternator. It is fully compatible with 'smart' alternators found in Euro 5 and later vehicles and is Bluetooth-enabled, so can be monitored and configured remotely via the VictronConnect app. It can be used to charge all lead-acid battery types (wet, Gel, AGM) as well as lithium and the charging profile is fully configurable to allow you to match the voltages recommended by your battery's manufacturer.

This charger has separate, galvanically-isolated negative connections for the starter and auxiliary batteries. You would require the isolated version where your starter and auxiliary batteries don't have an electrically-common negative connection or where, for your particular application, it is preferable to keep them separated. This unit will still function perfectly well in a setup where the batteries have a common negative connection, but you would not be making use of the isolation feature.

The Orion Smart unit can operate as a fully configurable battery charger with an adaptive 3-stage charging algorithm, or as a DC-DC converter. The adaptive charging algorithm means that, for lead-acid batteries, the charger will automatically modify the absorption time to account for the depth of discharge. For shallower discharges, the absorption time is reduced to prevent over-charging.

Unlike other DC-DC chargers that rely on hard-wired signaling from the alternator or ignition, the Orion Smart does not require any additional wires or sensors which simplifies installation.  The 'engine-on' detection is software-driven and is fully configurable via the VictronConnect app.

This unit will operate in high temperatures up to 55°C and it will produce the full rated output of 18A up to 40°C.


  • Electrically-isolated negative connections
  • 'Smart alternator' compatible (Euro 5, 6, 6+)
  • Built-in Bluetooth and fully configurable via smartphone app
  • Adaptive 3-stage charge algorithm
  • Fully programmable battery charging profile
  • Suitable for all battery types (including lithium)
  • Can operate as a fixed voltage DC-DC converter
  • 'Engine-On' software detection for simplified wiring
  • Short-circuit proof
  • Remote on/off facility
  • High temperature protection
  • Units can be wired in parallel to increase output

Victron Energy Orion-Tr Smart 12/12-18A Isolated DC-DC charger

SKU: ORI121222120
Sales Tax Included |
    • Input voltage range: 8-17 V
    • Under-voltage shut down: 7V
    • Under-voltage re-start: 7.5V
    • Nominal output voltage:  12.2V
    • Output voltage range: 10-15V
    • Output voltage tolerance: +/-0.2V
    • Continuous output current: 18A (up to 40ºC)
    • Maximum output current (for 10s): 25A
    • Short circuit output current: 40A
    • Continuous output power at 25ºC: 280W
    • Continuous output power at 40ºC: 220W
    • Ingress Protection rating: IP43 (screw terminals facing downwards)
    • Efficiency: 87%
    • No load input current: <80mA
    • Standby current: <1mA
    • Operating temperature range: -20 to +55ºC
    • Cable connections: Screw terminals
    • Max. cable cross-section: 16mm2 (6 AWG)
    • Dimensions: 130 (H) x 185 (W) x 80 (D) mm
    • Part Number:  ORI121222120
    • Bar Code:  8719076046066
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