SKU: 80140866035

Victron 120A Battery Isolator Argodiode 120-2AC | 2 Batteries

Sale price$105.30 Regular price$117.00
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Description

Victron 120A Battery Isolator Argodiode 120-2AC | 2 BatteriesVictron 120A Battery Isolator Argodiode 120 2AC: High Efficiency Schottky Diode Battery Isolator for Dual and Multi Bank Charging Reliable Simultaneous Charging Without Battery Interconnection The Victron 120A Battery Isolator Argodiode 120 2AC is a robust diode battery isolator engineered to enable simultaneous charging of 2 separate battery banks from a single alternator, without electrically connecting the batteries together. This ensures that

Victron 120A Battery Isolator Argodiode 120-2AC: High-Efficiency Schottky Diode Battery Isolator for Dual and Multi-Bank Charging

Reliable Simultaneous Charging Without Battery Interconnection

The Victron 120A Battery Isolator Argodiode 120-2AC is a robust diode battery isolator engineered to enable simultaneous charging of 2 separate battery banks from a single alternator, without electrically connecting the batteries together. This ensures that discharging an accessory or auxiliary battery—such as a house bank in a caravan, boat, or 4WD—will not drain the starter battery, preserving engine start capability and reducing the risk of being stranded. Unlike generic split-charge relays or basic isolators, this Victron unit uses advanced Schottky diode technology to minimise voltage drop, delivering more efficient charging and longer battery life.

Designed for 12V and 24V DC systems, this isolator is ideal for marine, automotive, and off-grid applications where reliable multi-battery management is critical. Its low forward voltage drop—approximately 0.3 V at low current and 0.45 V at rated output—reduces energy loss and heat generation, ensuring more of the alternator’s output reaches your batteries. This is a significant advantage over conventional silicon diode isolators, which can drop 0.7 V or more, leading to chronic undercharging and premature battery failure.

Advanced Schottky Diode Technology for Superior Performance

At the core of the Victron 120A Battery Isolator Argodiode 120-2AC are high-efficiency Schottky diodes, which provide a lower forward voltage drop compared to standard PN-junction diodes. This means less power is wasted as heat, and the alternator can operate closer to its intended voltage setpoint. The integrated voltage compensation diode allows you to fine-tune the alternator’s output voltage to offset the small remaining drop, ensuring batteries reach a full state of charge. This feature is especially valuable in systems where battery longevity and performance are paramount, such as in deep-cycle AGM or lithium battery setups.

Additionally, the Victron 120A Battery Isolator Argodiode 120-2AC includes a current-limited alternator energize input which is essential for modern alternators that require a DC voltage on the B+ terminal to initiate charging. Without this input, a diode isolator would block the return voltage, preventing the alternator from starting. The energize circuit provides a safe, controlled current to the B+ terminal when the engine run/stop switch is closed, ensuring reliable alternator activation.

Built for Demanding Environments

Victron’s Argo Diode isolators are constructed with a durable anodised aluminium heat sink that efficiently dissipates heat, allowing continuous operation at high currents without thermal throttling. The compact footprint—60 x 120 x 115 mm—and light weight of 0.8 kg make installation straightforward in tight engine bays or electrical compartments. Heavy-duty M8 Studs stud terminals ensure secure, low-resistance connections for high-current cables, while the 6.3 mm Faston connectors for compensation and energize simplify wiring.

All models are rated for mounting on non-flammable surfaces and are tested to withstand the vibration, temperature extremes, and salt-laden air common in marine and automotive environments. This rugged design reduces the risk of premature failure and electrical faults that can occur with lesser-quality isolators.

Key Features

  • Simultaneous charging of 2 battery banks from one alternator without interconnection
  • Low voltage drop Schottky diodes: ~0.3 V at low current, ~0.45 V at rated output
  • Integrated voltage compensation diode to optimise alternator output
  • Current-limited alternator energize input for modern alternators
  • Heavy-duty M8 Studs stud terminals for secure high-current connections
  • Compact, lightweight aluminium heat sink for efficient cooling
  • Suitable for 12V and 24V DC systems
  • Robust construction for marine, automotive, and off-grid use

Applications

The Victron 120A Battery Isolator Argodiode 120-2AC is an excellent choice for a wide range of dual-battery and multi-battery systems, including:

  • Marine vessels: separate starter and house battery banks
  • Caravans and motorhomes: charging auxiliary batteries while driving
  • 4WD and off-road vehicles: powering winches, fridges, and camping accessories
  • Commercial vehicles: maintaining separate battery systems for equipment
  • Off-grid solar systems: combining multiple charge sources without back-feed

Installation Considerations

When installing a diode battery isolator, it is important to account for the slight voltage drop across the diodes. The integrated compensation diode can be used to adjust the alternator’s voltage regulator, but in some systems, additional wiring modifications may be required. For optimal battery health and charging performance, consult the Victron ‘Energy Unlimited’ book or seek advice from a qualified auto electrician or marine installer. Proper cable sizing and termination are critical to minimise additional voltage losses and ensure safe, reliable operation.

Upgrade your battery management system with the Victron 120A Battery Isolator Argodiode 120-2AC and enjoy the peace of mind that comes with Victron’s proven reliability and engineering excellence. Whether you’re outfitting a bluewater cruiser, a remote-area tourer, or a commercial fleet vehicle, this isolator delivers the performance and durability you need to keep all your batteries charged and ready.

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 80140866035

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4.9 ★★★★★
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AKO
Battle Creek, US
★★★★★ 5
Comfortable Even After Long Hours
Color: Black, Number of Items: 1
I purchased this chair for my husband’s home office, and it has been a great choice. The height and angle can be adjusted very easily, making it comfortable to customize. Assembly was also simple and straightforward. The size is just right, and it remains comfortable even after sitting for long periods of time without causing fatigue. Overall, the quality exceeded my expectations for the price. If it ever breaks, I would definitely purchase the same one again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
M
Verified Purchase
MrDerp
Los Angeles, US
★★★★★ 3
Not an average-to-large person's chair by any means.
Color: Brown, Number of Items: 1
PROS: Comfortable seat cushion Feels sturdy and manufactured well Swivels and rolls effortlessly Height adjustment Not terribly heavy Easy assembly CONS: Reclining feature is not great Back cushion forces a very upright sitting posture Pleather material will deteriorate within a couple years It's overpriced for what it is, even at $100. SUMMARY: I'm a little guy. 5'7 and 145 lbs. This chair feels like it was scaled for me and my little frame. Now, while that's perfect for me, nearly everyone else I know or have ever known, are at least twice my size. And I can't imagine them finding the overall size of this thing to be enough chair for them. Maybe I'm way off base here, but I've sat in regular sized office chairs and while they'd swallow me, they're essentially perfect sized for most other people. Feels good to sit in, nothing amazing but it's comfortable enough. Remember, it's made with pleather. Every day use for long periods of time will wear the material out within two or three years. Won't effect it's performance but it will be ugly with cracks and wear/tear far quicker than real leather, of course. It looks very nice right out the box though. Not too heavy either. The reclining feature is a bummer, it's like you really have to force it to lean back, like it's fighting against your doing so. Which if your trying to lean back, you know putting a bunch of effort into your legs is the opposite of what you're trying to achieve - which is relax without tension in any part of your body. It's basically useless for my needs, anyway. The price, even at a measly $100 for an "executive office chair" does not reflect the hiccups with this thing because it's not a one size fits all kind of chair. Anyone over 180 lbs and 5'10 will surely find it to be a bit snug and the back cushion to sit a bit short. The back forces you to sit very upright. Something that will take getting used to, especially since I can't recline. This chair is kinda "meh" to be completely honest. I'll spend at least twice as much next time and get five times the quality. Look, it'll do the job for a while but there really isn't anything very impressive about it besides what it visually looks like. I've no idea how so many people rated this thing with so many glowing reviews. There's not a lot to boast about with a cheap $100 pleather chair that's undersized for most people. I really don't get it. I'd only recommend this at $65-$70. No way this is worth the $100 Amazon is currently pricing it at. Spend just a little a bit more, you'll notice a huge jump in quality over this.
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Reviewed in the United States on August 15, 2024
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MrTruth
Grantham, US
★★★★★ 3
Just Great!
Color: Beige, Number of Items: 1
Comfortable. Wheels roll very well. Great padding. Seems durable. Assembly is the standard with such chairs, takes about 15 minuttes. Do not know how long the PL? leather fabric will last? Probably wear in a couple of years. But for the price, this is perfect. UPDATE: After 2 1/2 months, seat feels flat and very uncomfortable.
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Reviewed in the United States on March 12, 2026
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VicYay
Carnegie, US
★★★★★ 5
Modern and comfortable, easy to assemble
Color: White, Color: White
Reliable chair with solid quality. Assembly took about 35 mins following the clear instruction sheet. Chair can hold at least 220 lbs, stable and easy to move. Wheels can move in multiple directions. Seat heights and arm are both adjustable. No stain or scratches on the padding surface. White finish looks clean and modern.
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Reviewed in the United States on April 27, 2026
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boo h 1964
Lowell, US
★★★★★ 5
Impressive Chair for the price!
Color: Black
Purchased for my mother, she absolutely loves it. She used a secretary style chair forever and said she didn't want a big bulky chair like the executive type until she saw this one. It's comfortable like an executive chair but not quite a big or cumbersome as the executive can be. It took a hot minute to put together but well worth it. Instructions were very clear and easy, I'm in my 60's, if I can put it together anybody can! Chair is well made, solid!
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Reviewed in the United States on May 8, 2026

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