Argo Diode Battery Isolators - 120A dual output - Victron Energy
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Product Information
Full details
The Victron Energy ARG120201020R is a diode battery isolator designed for systems needing to charge multiple batteries from a single alternator without cross-connecting them. It's ideal for marine, RV, or off-grid applications where maintaining separate battery banks (e.g., starter and accessory) is crucial. A key benefit is preventing discharge of one battery from affecting another. The primary caveat is the inherent voltage drop associated with diode-based isolation.
All features
| Model Part Number | 120-2AC |
|---|---|
| Brand | Victron Energy |
Extended Product Information
FAQs
What is the main purpose of a diode battery isolator?
Its main purpose is to allow a single alternator to charge multiple batteries simultaneously while keeping them electrically isolated from each other. This prevents one battery from discharging another.
Why is there a voltage drop with this type of isolator?
A voltage drop occurs because the diodes require a certain forward voltage to conduct electricity. The Victron Energy ARG120201020R uses Schottky diodes to minimize this drop compared to standard diodes.
What does the compensation diode do?
The compensation diode is connected to the alternator's field winding (if applicable) or is used to slightly boost the alternator's output voltage, helping to counteract the voltage drop across the isolator's main diodes.
Can I use this with a smart alternator?
While it can be used, smart alternators often have variable voltage outputs. It's recommended to consult Victron Energy's documentation or a qualified technician to ensure compatibility and optimal performance with smart alternators.
How many batteries can I charge with the ARG120201020R?
This specific model, the 120-2AC, is designed to charge two batteries from one alternator.
What is the maximum current rating?
The ARG120201020R is rated for a maximum alternator current of 120 Amperes.
Does this isolator require any special wiring for charging?
Standard wiring involves connecting the alternator output to the isolator input, and then connecting each battery to a separate output terminal. Ensure correct polarity.
Troubleshooting
One battery not charging
Check connections to the isolator. Ensure the alternator is functioning correctly. Verify the integrity of the diodes within the isolator.
Low charging voltage at accessory battery
Verify the compensation diode is correctly wired. Check cable lengths and gauge for excessive resistance. Ensure the isolator is not overheating.
Isolator getting excessively hot
Ensure proper ventilation. Check if the alternator's current output exceeds the 120A rating. The isolator is designed to get warm, but excessive heat may indicate a problem.
Both batteries discharging each other
Confirm that the batteries are connected to separate outputs of the isolator and that the isolator is correctly wired to the alternator. Check for any accidental direct connections between battery banks.
Pros and Cons
Pros
- Ensures starter battery remains available by isolating accessory battery usage.
- Low voltage drop due to Schottky diode technology.
- Built-in compensation diode helps maintain optimal charging voltage.
- Durable construction suitable for demanding environments.
- Simple installation for basic dual-battery setups.
Cons
- Introduces a voltage drop, requiring compensation.
- Not suitable for systems requiring absolute zero voltage drop.
- Requires careful consideration of alternator capacity.
- Limited to two battery banks.
- Diode technology generates heat that needs dissipation.
Setup, Compatibility & Care
Setup:
- Identify the alternator output terminal and the input terminal on the isolator.
- Connect the alternator output to the isolator's input.
- Connect the starter battery positive terminal to one of the isolator's output terminals.
- Connect the accessory battery positive terminal to the other isolator's output terminal.
- Ensure all connections are secure and properly insulated.
- Connect battery negatives to a common ground.
Compatibility:
- Compatible with 12V systems.
- Suitable for alternators rated up to 120A.
- Can be used with lead-acid, AGM, Gel, and other standard battery chemistries. Ensure battery charging profiles are compatible with the alternator's output.
Care:
- Periodically check all electrical connections for tightness and corrosion.
- Ensure adequate ventilation around the isolator to dissipate heat.
- Keep the unit clean and free from debris.
- Inspect for any physical damage.