Victron Argodiode 100-3AC 3 batteries Isolator
Victron Argodiode 100-3AC 3 batteries Isolator
SKU:792-ARG100301000R
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Victron Argodiode 100-3AC Battery Isolator
100A | 3 Battery Banks | Alternator Energize Input
The Victron Argodiode 100-3AC is a robust diode battery isolator designed to enable simultaneous charging of up to three independent battery banks from a single alternator or charging source. This essential component ensures that while all batteries receive charge, they remain electrically isolated, preventing a discharged accessory battery from affecting your vital starter battery.
Utilising high-efficiency Schottky diodes, the Argodiode 100-3AC minimises voltage drop, offering approximately 0.3V at low current and 0.45V at its rated 100A output. This model includes a compensation diode and an alternator energize input, making it suitable for a wide range of marine, automotive, and off-grid applications where reliable, isolated multi-battery charging is critical.
KEY FUNCTION: Charges up to three battery banks from one source while maintaining full electrical isolation between them.
Key Features
| ▶ Three Battery Bank Isolation — Safely charges up to three separate battery banks from a single alternator or charger. |
| ▶ Low Voltage Drop Schottky Diodes — Minimises energy loss with approximately 0.3V drop at low current and 0.45V at full 100A output. |
| ▶ Alternator Energize Input (AC Model) — Ensures modern alternators start charging correctly by providing initial DC voltage to the B+ terminal. |
| ▶ Compensation Diode — Allows for a slight increase in alternator output voltage to offset the voltage drop across the isolator diodes. |
| ▶ Robust M6 Stud Connections — Provides secure and reliable connections for high current applications. |
| ▶ Compact & Durable Design — Suitable for permanent installation in various demanding environments. |
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | Argodiode 100-3AC |
| SKU | ARG100301000R |
| Manufacturer | Victron Energy |
| Product Type | Diode Battery Isolator |
| Max. Charge Current | 100 A |
| Max. Alternator Current | 100 A |
| Number of Batteries | 3 |
| Voltage Drop (Low Current) | ≈ 0.3 V |
| Voltage Drop (Rated Output) | ≈ 0.45 V |
| Alternator Energize Input | Yes |
| Main Connections | M6 Studs |
| Auxiliary Connections | 6.3mm Faston |
| Dimensions (H x W x D) | 60 x 120 x 115 mm |
| Weight | 0.8 kg |
System Integration Notes
The Argodiode 100-3AC is engineered for seamless integration into 12V and 24V DC systems where multiple battery banks require charging from a single source, such as an alternator or a battery charger. Its design addresses common challenges in multi-battery setups:
- Voltage Compensation: The integrated compensation diode is crucial for maintaining optimal charging voltage. Without it, the inherent voltage drop across the isolator's diodes could lead to undercharged batteries and premature ageing. This feature allows compatible alternators to slightly increase their output voltage, ensuring batteries reach a full state of charge.
- Alternator Compatibility: Many modern alternators require a small DC voltage on their B+ output to initiate charging. Diode isolators can block this return voltage. The 'AC' models, like the 100-3AC, feature a current-limited energize input that provides this necessary voltage when the engine run/stop switch is closed, ensuring the alternator starts charging reliably.
- Independent Battery Management: By isolating each battery bank, the Argodiode prevents loads on one bank (e.g., leisure accessories) from discharging other banks (e.g., the engine start battery), safeguarding critical power for essential functions.
Typical Applications
| Application | Description |
|---|---|
| Marine Vessels | Ideal for boats with separate engine start, service (house), and auxiliary battery banks (e.g., thruster, electronics). |
| RVs & Campervans | Ensures the engine start battery remains charged while powering leisure equipment from a separate house battery. |
| Off-Grid Systems | For vehicles or installations with multiple battery banks needing charging from a single alternator or DC source. |
| Commercial Vehicles | Maintains independent power for communication, safety, or specialised equipment while ensuring vehicle starting capability. |
Built-In Protection Functions
The Victron Argodiode 100-3AC provides fundamental electrical isolation to prevent cross-discharge between battery banks. It is designed for robust operation, but users should be aware that the unit can generate heat during high current operation. Installation on a non-flammable surface is recommended to ensure safety. The use of Schottky diodes contributes to efficient power transfer with minimal heat generation compared to older diode technologies.
Common Questions
What is the primary purpose of a battery isolator?
A battery isolator, like the Argodiode 100-3AC, allows multiple battery banks to be charged simultaneously from a single source (e.g., an alternator) while keeping them electrically separated. This prevents one battery bank from discharging into another, ensuring critical batteries (like a starter battery) remain charged.
How does the Argodiode minimise voltage drop?
The Argodiode 100-3AC uses high-efficiency Schottky diodes, which inherently have a lower forward voltage drop compared to standard diodes. This results in less energy loss and more efficient charging, with a typical drop of 0.3V at low current and 0.45V at rated output.
Why does this model have an "Alternator Energize Input"?
Some modern alternators require a small DC voltage on their B+ output terminal to begin charging. A standard diode isolator would block this voltage. The Argodiode 100-3AC's energize input provides this necessary voltage when the engine is running, ensuring the alternator activates and charges the batteries correctly.
Is additional compensation needed for voltage drop?
The Argodiode 100-3AC includes a compensation diode feature. When connected to an alternator with a voltage sense input, this allows the alternator's output voltage to be slightly increased, effectively compensating for the voltage drop across the isolator and ensuring batteries are fully charged.
Installation Notes
- Always disconnect battery negative cables before performing any electrical work.
- Connect the positive output of the charging source (alternator) to the isolator's input.
- Connect the positive terminals of each battery bank to the respective outputs (1, 2, and 3) of the isolator.
- For alternators requiring it, connect the 'Energize' blade terminal to the engine run/stop switch.
- Optionally, connect the alternator's voltage sense to the compensation output of the Argodiode for optimal charging.
- Ensure all negative battery poles are connected to a common negative bus bar.
- Mount the Argodiode on a non-flammable surface, as it can become warm during operation.
- Keep cable lengths as short as possible and ensure adequate cross-section to minimise additional voltage drop.
Before You Buy
- System Voltage: Confirm your system operates at 12V or 24V DC, as Argodiode isolators are designed for these common voltages.
- Current Rating: Ensure the 100A maximum current rating of this isolator is sufficient for your alternator and total charging current requirements.
- Number of Batteries: Verify you require isolation for three battery banks. Other Argodiode models are available for two banks.
- Alternator Type: If your alternator requires a B+ energize signal to start charging, this 'AC' model with the energize input is suitable.
- Installation Expertise: Installing a diode isolator requires careful consideration to avoid undercharging. Consult the Victron Energy 'Energy Unlimited' guide or seek specialist advice for optimal setup.
Always verify product specifications and compatibility with your existing system before purchase. Victron Energy offers a 5-year standard warranty on power products.
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