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Victron Energy Orion-Tr Smart 24/12-20A Intelligent Isolated DC-DC Charging for Dual Battery Systems
Product Overview
The Victron Energy Orion-Tr Smart 24/12-20A (ORI241224120) is a professional-grade isolated DC-DC charger rated at 20 amps and 240 watts, designed to charge a 12V secondary (house or lithium) battery from a 24V primary (starter) system in dual battery setups across vehicles, 4WDs, boats, and off-grid installations. Unlike a basic DC-DC converter, the Orion-Tr Smart is a true 3-stage adaptive charger delivering Bulk, Absorption, and Float charge stages to both lead acid and lithium battery chemistries, with eight pre-programmed battery profiles and a fully programmable custom algorithm configurable through the VictronConnect app via built-in Bluetooth.
What makes the Orion-Tr Smart the correct choice for modern vehicles is its smart alternator compatibility. Current-generation vehicles use ECU-controlled variable-voltage alternators that can confuse or damage basic DC-DC converters. The Orion-Tr Smart includes an engine running detection mechanism that actively monitors whether the alternator is supplying power preventing the charger from discharging the starter battery when the engine is off or the alternator is in a low-output phase. The unit is galvanically isolated between input and output, making it suitable for marine applications and lithium battery systems with BMS control. It operates to IP43, sustains full rated output to 40°C, and can handle up to 55°C with thermal derating relevant in Australian 4WD and marine environments where ambient temperatures regularly challenge electronics.
Key Specifications
- Part Number: ORI241224120
- Charger Type: Isolated DC-DC adaptive 3-stage charger
- Input Voltage: 24V DC nominal
- Output Voltage: 12V DC
- Output Current: 20A
- Output Power: 240W
- Isolation: Galvanically isolated (input and output fully separated)
- Charge Algorithm: Adaptive 3-stage — Bulk, Absorption, Float
- Battery Compatibility: Lead acid (all types) and lithium
- Pre-Programmed Profiles: 8 (plus fully custom programmable)
- Bluetooth: Built-in (VictronConnect app — iOS and Android)
- Smart Alternator Compatible: Yes — engine running detection
- Remote On/Off: Yes — hardwired connector or VictronConnect app
- Parallel Operation: Yes — unlimited units
- IP Rating: IP43
- Operating Temperature: Full rated output to 40°C; operates to 55°C with thermal derating
- Protection: Over-temperature with power derating, overload, short circuit, connector over-temperature
Features & Benefits
- Galvanic Isolation — The input (24V starter) and output (12V secondary) circuits are fully electrically separated. This protects the secondary lithium battery and BMS from starter battery noise and voltage events, prevents stray current corrosion in marine installations, and allows correct BMS integration where the secondary battery's charge/discharge cycle must be independently managed.
- True 3-Stage Adaptive Charging — Bulk, Absorption, Float — The Orion-Tr Smart charges like a proper battery charger, not just a DC power supply. Bulk delivers maximum available current to rapidly recharge a depleted battery. Absorption holds at the correct voltage to fully saturate the cells without overcharging — with adaptive absorption time that shortens for shallow discharges and extends for deep discharges on lead acid, and a fixed 2-hour default for lithium. Float maintains a full battery at a safe holding voltage. This is the charge profile your secondary battery needs for long-term health — a flat DC voltage from a basic converter is not.
- Smart Alternator Compatibility with Engine Running Detection — Modern ECU-controlled alternators vary their output voltage and can shut down during low-demand phases — a basic DC-DC converter may interpret a shut-down alternator as a power source and discharge the starter battery. The Orion-Tr Smart detects whether the alternator is actively supplying power and disables itself when it is not, protecting the starter battery in all conditions.
- Built-in Bluetooth — VictronConnect App — Monitor charging status, configure battery profiles, adjust charge parameters, and update firmware wirelessly from any iOS or Android device. No wiring to a GX device required for basic monitoring — Bluetooth provides direct phone-to-charger access in the field.
- Lead Acid and Lithium Compatible — Eight pre-programmed profiles cover the full range of lead acid battery types (flooded, AGM, gel) and lithium chemistries, with a fully programmable custom algorithm available for non-standard battery specifications. Switch profiles via the app — no hardware changes required.
- Remote On/Off — Hardwired and App-Controlled — Enable and disable the charger via a hardwired remote switch, a BMS output signal, or directly through the VictronConnect app. Supports both user-operated manual control and automatic BMS-driven charge management.
- Unlimited Parallel Operation — Multiple Orion-Tr Smart units can be connected in parallel without limit to increase combined charging current — scale to 40A, 60A, 80A, or beyond by adding units. Each unit operates independently, maintaining its own charge algorithm.
- IP43 Rated — Protected against solid objects greater than 1mm and water spray up to 60° from vertical. Suitable for enclosed panel, under-bonnet, and protected bilge installations — not designed for direct rain or immersion exposure without an enclosure.
- Full Output to 40°C — Operates to 55°C — Sustains full 20A rated output in ambient temperatures up to 40°C. Above 40°C the unit applies progressive thermal derating rather than hard cut-off, maintaining some output even in hot engine bays and tropical conditions — relevant across the Australian climate range.
- Over-Temperature Power Derating — Rather than shutting down abruptly when hot, the charger progressively reduces output to keep operating temperatures safe. Charging continues at a reduced rate rather than stopping entirely — important for live systems that cannot afford an unplanned interruption.
- Connector Over-Temperature Protection — Independent protection for the terminal block and connector assembly, guarding against heat buildup at the connection points under sustained high-current operation.
Technical Specs
| Specification | Detail |
|---|---|
| Part Number | ORI241224120 |
| Charger Type | Isolated DC-DC adaptive 3-stage charger |
| Input Voltage | 24V DC nominal |
| Output Voltage | 12V DC |
| Output Current | 20A |
| Output Power | 240W |
| Isolation | Galvanically isolated |
| Charge Stages | Bulk, Absorption, Float |
| Adaptive Absorption | Yes — lead acid (depth-based); lithium fixed 2hr default |
| Battery Profiles | 8 pre-programmed + fully custom |
| Battery Compatibility | Lead acid (all types) + lithium |
| Bluetooth | Built-in (VictronConnect — iOS and Android) |
| Smart Alternator Compatible | Yes — engine running detection |
| Remote On/Off | Yes — hardwired connector and VictronConnect app |
| Parallel Operation | Yes — unlimited units |
| IP Rating | IP43 |
| Full Rated Output Temperature | Up to 40°C ambient |
| Maximum Operating Temperature | 55°C (with thermal derating above 40°C) |
| Over-Temperature Protection | Yes — with progressive power derating |
| Overload Protection | Yes |
| Short Circuit Protection | Yes |
| Connector Over-Temperature Protection | Yes |
Compatible With / Goes Well With
Primary Applications:
- 24V vehicle dual battery systems — charging 12V secondary (house/lithium) bank from 24V starter system
- 4WDs, utes, and expedition vehicles with 24V primary systems and 12V accessory banks
- Marine vessels — 24V start bank to 12V service bank (isolated, suitable for corrosion-sensitive marine wiring)
- Off-grid and solar systems with 24V primary bank and 12V secondary loads or battery
- Caravans and camper trailers connected to 24V tow vehicles
Secondary Battery Types:
- All lead acid chemistries — flooded, AGM, gel
- Lithium (LiFePO4 and compatible chemistries — confirm profile via VictronConnect app)
Parallel Expansion:
- Unlimited Orion-Tr Smart 24/12-20A units in parallel for higher combined output (40A, 60A, etc.)
Accessories:
- Victron ASS070300100 Remote Cable (required if BMS remote on/off is referenced to secondary battery — see separate listing)
- Victron SmartShunt or BMV-712 (secondary battery monitoring)
- Victron Cerbo GX (full system integration via VE.Direct or VE.Can — confirm connectivity)
- Victron VictronConnect app (free — iOS and Android)
Frequently Asked Questions
What is the difference between this and a basic non-isolated DC-DC converter?
A basic DC-DC converter outputs a fixed voltage — it does not manage charge stages and cannot correctly charge a battery. The Orion-Tr Smart is a true 3-stage charger (Bulk, Absorption, Float) with adaptive algorithms for lead acid and lithium, galvanic isolation between input and output, and smart alternator detection. It charges your secondary battery correctly rather than just applying voltage to it.
Why does galvanic isolation matter in a dual battery system?
Galvanic isolation fully separates the electrical circuits of the two batteries. In marine applications this prevents stray current corrosion caused by ground loops. In lithium systems it allows the BMS to independently manage the secondary battery without the primary battery interfering. It also protects sensitive lithium cells and BMS electronics from starter battery voltage spikes and noise.
Does the Orion-Tr Smart work with smart alternators in modern vehicles?
Yes. The built-in engine running detection mechanism monitors whether the alternator is actively supplying power. When the alternator is shut down by the ECU — a normal operating state in fuel-efficiency-optimised vehicles — the Orion-Tr Smart disables itself rather than drawing from the starter battery. This makes it compatible with variable-voltage smart alternators in current-generation vehicles.
Can multiple units be run in parallel for higher charging current?
Yes. An unlimited number of Orion-Tr Smart 24/12-20A units can be connected in parallel. Each unit operates its own charge algorithm independently — combine two for 40A, three for 60A, and so on.
Do I need the ASS070300100 remote cable if I have a lithium BMS?
Possibly. If your lithium BMS controls charging by switching the remote on/off signal and that signal is referenced to the secondary (lithium) battery, the ASS070300100 Remote Cable is required for correct integration. If your remote on/off signal is referenced to the primary battery — or you are using a manual switch — the standard remote connector works without the additional cable.
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