SKU: 30821840512

Victron 100A Battery Isolator Argo FET 100-3 | 3 Batteries

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Description

Victron 100A Battery Isolator Argo FET 100-3 | 3 BatteriesReliable multi battery charging without cross discharge The Victron Argo FET 100 3 100A Battery Isolator is a high efficiency battery isolator designed to charge 3 battery banks from a single alternator or a single output battery chargerwhile keeping each battery electrically separated. That separation is the key benefit: powering lights, a fridge or a winch from your auxiliary battery bank is far less likely to flatten the starter battery, helping

Reliable multi-battery charging without cross-discharge

The Victron Argo FET 100-3 100A Battery Isolator is a high-efficiency battery isolator designed to charge 3 battery banks from a single alternator or a single-output battery charger—while keeping each battery electrically separated. That separation is the key benefit: powering lights, a fridge or a winch from your auxiliary battery bank is far less likely to flatten the starter battery, helping improve vehicle reliability for touring, marine and off-grid power setups across Australia.

Unlike traditional diode splitters, this unit uses FET isolator technology to minimise voltage drop. In practical terms, more of your alternator’s output reaches your batteries, which can support better charge acceptance and shorter run times in real-world systems. It also avoids the common need to raise alternator voltage to compensate for isolator losses—particularly helpful when you’re integrating modern battery chemistries or managing longer cable runs.

Designed for touring, marine and off-grid electrical systems

This isolator suits common 12V and 24V automotive and marine power systems with 12/24V auto-ranging operation. It’s a strong fit for caravans, 4WD dual-battery installs, work utes, boats, and remote power cabinets where you want straightforward alternator charging distribution without tying battery banks together. Each output is independently isolated, so different battery banks can be charged simultaneously while remaining protected from mutual discharge paths.

Helps alternators start charging when split charging is installed

Some alternators require a sense/return voltage on the B+ output to begin charging. When an isolator is installed, that return path can be reduced—occasionally leading to delayed or no alternator start-up. This unit includes an alternator energise input to assist with alternator excitation in these scenarios, supporting stable charging behaviour when the engine run/stop circuit is engaged. This is particularly relevant in modern vehicles and certain marine alternator configurations.

Installation notes that protect performance

As with any high-current battery isolator, overall charging performance depends heavily on cable sizing, connection quality and cable length. Keeping cable runs short and selecting an appropriate conductor cross-section helps reduce voltage drop in the wiring so the benefits of low-loss FET switching are preserved. For best results, follow Victron wiring guidance and use properly crimped lugs, secure fasteners and sound corrosion protection—especially in coastal and marine environments.

Key features

  • Simultaneous charging of 3 battery banks from one alternator or charger
  • FET technology for very low voltage drop compared with diode splitters
  • Battery bank isolation helps reduce the risk of draining the starter battery from auxiliary loads
  • 12V/24V system compatibility with auto-ranging operation
  • High-current terminals for secure connections in demanding automotive and marine installs
  • Status indication to support quick checks during commissioning and fault-finding

Very low voltage drop (typically around 0.02V at low current, averaging about 0.1V at higher currents) helps maximise charging voltage at the batteries compared with diode isolators.

Alternator energise input can assist alternator start-up in systems where the alternator needs B+ voltage present to begin charging.

Build a more dependable dual-battery or multi-battery system

If you’re planning a 3-battery split-charging setup and want a proven way to distribute alternator charging while keeping battery banks isolated, the Victron Argo FET 100-3 100A Battery Isolator is a practical, low-loss solution. Add it to your setup to support cleaner power management and more confident starts on the road or at sea.

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SKU: 30821840512

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4.6 ★★★★★
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Jenna H
Birmingham, US
★★★★★ 4
Good discussion book to eliminate conflict between couples
Format: Kindle
Use this book as a checklist of things you should discuss with your partner - especially if you're considering or are in a long-term relationship. It explains each topic, why it's a likely source of conflict, how to prevent the conflicts, and includes questions for discussion between partners. Understanding and discussing these topics may not feel romantic and fun, and some of the conversations may be challenging for couples who aren't accustomed to such discussions. Do it anyway though because it will eliminate future conflicts before the conflicts even begin and make your relationship run smoother, last longer, and be a source of relaxation and contentment for you both. I'm speaking from experience here. If you are new to the study of this topic, this book will be extremely valuable for you. If you've already studied interpersonal relationships, preemptive conflict resolution, and collaborative negotiation tactics, it's still a great checklist of topics to discuss with your partner. I'm on this end of the spectrum, hence 4 of 5 stars because I'm familiar with the author's other work and this book didn't contain much new content. As a compact, all-in-one, relationship discussion guide though, it's great and worth reading and having on hand for future reference for new relationships or for when new conflicts crop up.
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Reviewed in the United States on March 3, 2018
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Johanna
Chelsea, US
★★★★★ 5
Easy to read
Format: Paperback
Very interesting book!
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Reviewed in the United States on April 20, 2026
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Susan
Bozeman, US
★★★★★ 5
Great for Everyone!
Format: Paperback
This book is very useful to prepare people for marriage and I would recommend it for teens (even if they're not in a relationship), engaged couples, and even those already married since this provides realistic information about love and that not everything in a relationship is easy. It also helps people understand and attempt to loosely preset chores around the house and understand what to do with the extra money earned that isn't needed for bills. While I was already aware and have read about the 5 love languages, that is only briefly covered in one chapter while the rest provides other information so if you already read the 5 Love Languages book understand that there is a lot more involved in this book than that concept. The concept that I want to highlight in this book that I haven't read about before was the 5 Different Ways to Apologize. Increasingly, I think people need to be aware that what we consider to be a 'sincere apology' isn't necessarily the same as everyone else's though there are 5 of them that are fairly common. I was surprised when I found what I thought to be a sincere apology was listed word-for-word! This concept alone can be applied to anyone you socialize with and I especially recommend this piece if you are having apology problems between your friend, significant other, coworkers, and/or boss. Teens and those single will be able to learn a lot from this book, especially to realize that people, on average, are no longer "falling in love" within two years of the relationship and I think this would help them understand that relationships take a lot of work even when it's not convenient for you. Giving them an understanding of how to be flexible when apologizing and to know that people feel loved according to different love languages will make them more aware of how to improve their friendships and relationships in the future. Finally, there is reinforcement in being willing to do chores even if they're not popular and generally establishing healthy spending habits. I personally found this book to be thrilling and Gary Chapman successfully backs up some of his findings with Psychological research and definitions. I loved it so much that I read it in one sitting and now I'm getting my teen friends and budding couples into reading it. Awesome book; give it a try if you haven't already! (:
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Reviewed in the United States on June 30, 2016
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Jane Sen Gupta
Carnegie, US
★★★★★ 5
I love this!
Format: Paperback
This is a different type of marriage book. It’s very practical and addresses topics will affect you marriage that you can discuss beforehand. Many of these things get figured out along the way by way of arguments and disagreements or worse, just acquiescing without agreeing. (10 years later this is the reason you’re getting divorced and you haven’t ever talked about it. The other person has no idea & you never trusted them enough to tell them your feelings.). These topics range from who is going to clean the toilet to handling money and marrying into another family. It’s good practical thought and food for discussion. As the first chapter says “Being in love is not is not an adequate foundation for a successful marriage.”
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Reviewed in the United States on November 25, 2024
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Tina
Waukegan, US
★★★★★ 5
Thank You for this Incredible Book!
Format: Kindle
I am 19 and I am "unofficially" engaged. I know that he and I will most certainly without a doubt be getting married. We have known each other since we were 5 and 6 years old and have built a friendship with God at the center. We are trying our hardest to do things that right way considering we have both come from very (for lack of a better word) dysfunctional house holds. Both of my parents being on their third marriages each and his finally coming back to The Lord after many years of living in the world, haven't always been the best examples for us to learn from. We know exactly how we don't want to lead a marriage but we were not sure exactly how go about leading a proper or Godly marriage. This book, which I accidentally stumbled upon a few weeks ago, has been a serious eye opener and a total reality check. Though I will admit we were in the "tingles" stage, as Dr. Gary Chapman puts it, we have always tried to stay realistic. "Things I Wish I'd Known Before We Got Married" has truly taught us a lot of valuable lessons and I know we will keep the things we have learned from this book close at hand in the coming years. We thoroughly enjoyed reading this book, but what really made it interesting and kept us flipping the pages were the little anecdotes that were shared about other couples. Listening or reading their experiences really helped us relate to the situations that were being explained. We also liked the "Talking it Over" segments at the end of each chapter. Those we extremely useful when it came to understanding all the information that was just handed to us in the previous reading. I can not stop telling people about this book. I already have my sister and her husband reading it and it has greatly improved their relationship now after almost 4 months of marriage. I have also recommended it to each of my parents and my fiancé's parents as well because I know they could greatly benefit from it as I did. Thank You!
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Reviewed in the United States on October 16, 2013

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