Argo FET Image

Argo FET

Charging setup for LiFePo4 and Lead Acid: ArgoFET and/or Orion Tr Smart

I have three Lead Acid battery banks installed on my boat (house bank, starter battery, bow thruster battery) which are charged by the alternator (let's only focus on the alternator and ignore other chargers)

All three battery banks shall be strictly separated which is done with an ArgoFET (B+ --> ArgoFET --> 3 Battery banks).

Now I want to replace the house bank by a LiFePo4 battery. In order to protect the alternator from overheating I am planning to insert an Orion Tr Smart between the ArgoFET and the LiFePo4 battery. A great solution for me, because it's a minimal change in wiring.

In other forums I've read that this solution might not work out, because the hungry LiFePo4 will draw all the current from the alternator with the Lead Acid batteries left with next to nothing. What do you guys think, is this correct?

An alternative could be to connect the starter battery directly to the alternator, and to charge the LiFePo4 and the bow thruster (LA) battery via two separate Orions from there. But shouldn't the problem with the hungry LiFePo4 occur there as well?

Are there good reasons why this is the better setup? Well, for me it means more work and more cost.

Or is there another solution that is even better?



meester1-de asked
meester1-de answered ·

3 Answers

How to connect Smart solar MPPT 75/15 to an Argofet 100-3?

How to connect Smart solar MPPT 75/15 to an Argofet 100-3?

I have installed an Argofet to the 3 different batteries and would now like to install the Smart solar on the input of Argofet, is that possible or do I need to add some other device in between? If I only connect it to the input then will the MPPT be turned off.

ajforsberg asked
einar answered ·

1 Answer

Off grid installation with a 2. battery and ARGO Diode


I run an island system at home (currently with a 48V/120 AH LiFePo battery and a Smart Inverter 48V/3000W, as well as 9 solar panels with 150/35 Victron MPPTs).

Now I would like to integrate a 2nd battery pack 48V/50Ah with its own BMS.

That is, the charging current should come from the MPPTs, but no current should flow backwards to the inverter. I would like to supply a different circuit on this 2nd battery.

Could I interpose an Argo diode battery separator on the incoming side (from the MPPTs) and then connect the two batteries there?

The Argo diode battery separator is actually intended for the charging current from the alternator!

Thanks for helping

tbecks asked

0 Answers

Inselanlage mit 2 unterschiedlichen Batteriepacks / ARGO Dioden


ich betreibe zu Hause ein Inselanlage (z.Z. mit einem 48V/120 AH LiFePo Akku und einem Smart Inverter 48V/3000W, so wie 9 Solarpaneele mit 150/35 er Victron MPPTs).

Jetzt möchte ich noch einen 2. Akkupack 48V/50Ah mit eigenem BMS einbinden.

D.h. , der Ladestrom soll von den MPPTs kommen, aber es soll kein Strom Rückwärts zum Inverter fließen. Ich möchte an diesem 2. Akku einen anderen Stromkreis versorgen.

Könnte ich an der ankommenden Seite (von den MPPTs ) eine Argo Dioden Batterietrennung dazwischenschalten und dort dann die beiden Akkus anschließen ?

Der Argo Dioden Batterietrenner ist ja eigentlich für den Ladestrom von der Lichtmaschine gedacht !

Danke für einen Tip

tbecks asked

0 Answers

Energize permanently

I would be grateful if you could tell me if the "Energize" terminal of the Argofet battery isolator can be permanently connected to positive.

eien asked
offroadflow commented ·

2 Answers

Argo input- What does MPPT see?

The barge had it's last upgrade in the 80's; electrical system is clean and very professional, 24vdc 220v ac. When originally set up, battery charging was done through inverter/charger either via shore power, generator or engine alternator (standard vehicle unit, nothing special). There are three banks, house, starter and bow thruster. Inverter/charger (MulitPlus Compact, new 2016) is wired to house bank with trickle charger to starting bank. Alternator is routed through old school (pre-FET) Argo with one input and three outputs (Argo model 1203, max amps 120, max charger amps 75). In the mid 2000's solar was grafted onto the system with the controller connected to the Argo on the input terminal with the alternator. Since the generator has given up the ghost I'm going to significantly upgrade the solar. All battery chemistries are currently similar although lithium is in the cards for the house bank in a few years.

Is this a good way to set this up? Is there a better way? What does the MPPT "see" when running, the starter battery and bt battery full and the house bank at 70%? When there is no alternator input?

bargeman asked
eien answered ·

1 Answer

borne energize

argofet plan2.PNG


J'aimerais comprendre. On dit que la borne "energize" fournit du courant à B+. Mais sur le plan on la branche sur D+. J'ai fait mon installation et mon Argofet branché sur mes batteries j'ai une lecture de tension sur la borne input donc indirectement sur B+. Je n'ai rien changé sur mon circuit D+. Le "sense " de mon alternateur a donc une référence.

On dit que la borne "energize est optionel. Pourquoi?


menagoesenog asked
eien answered ·

1 Answer

Argo FET 200-2 "leakage"

I have an Argo FET 200-2 in my boat. Separating my LifePo4 AUX battery bank from the AGM starter batteries. I am struggling with a small reverse current flow between the battery banks.

Is it correct to say that the Argo FET 200-2 may be "leaking" and will allow som reverse current if it is Energized and as long as there is no alternator current running to the Input terminal?

mmosberg asked
roly answered ·

1 Answer

Argo FET for 2 alternators, 3 batteries

Replacing an old diode battery isolator here. The original was simple, with two inputs and 3 outputs.

Argo does not have a FET isolator with two inputs.

I was suggested to use two Argofet 100-3, and connect the outputs in parallel. I created a simple schematic of my understanding. Can someone with expertise on those boys to chime in?


jetkit asked
eien edited ·

3 Answers

Wie integriere ich den Orion TR 12/24 für das Bugstrahlruder?

Hallo zusammen,

ich plane derzeit die Neuverkabelung meiner Bootselektrik und folge dabei im wesentlichen dem angefügten Vorschlag. Nun stelle ich mir die Frage, wie ich am besten den Orion TR 12/24 für die 24V Batterie (tatsächlich zwei 12V Batterien in Reihe) des Bugstrahlruders integriere. Den Input des Orion einfach auf die positive und negative Busbar legen? Oder an den Output 1 des Argofet, also quasi parallel zur Starterbatterie?

Danke für Eure Ideen und Hinweise!



sauberli asked
Matthias Lange - DE commented ·

1 Answer

Cyrix-CT / Argofet Isolator with Supercapacitors

Hi, does anyone knows can a Cyrix-CT Battery Combiner or a Victron Argofet Battery Isolator be used to connect my w204 AGM starter battery and a pair of 100F Supercapacitors for my audio? My car has "Alternator Management" under my spec sheet.

If possible, which is preferred? Any advice will be greatly appreciated and thank you in advance.

Best Regards

davidw asked
davidw edited ·

0 Answers

230V Charger before Argofet 200-2 it works?

Argofet 200-2 and 230V charger, can you clamp the charger parallel to the alternator on the input of the Argofet and then charge both batteries with the alternator and the charger?

Background: If this works without problems, then I need a charger with only one output.

Greeting André

bugs-bunny asked
trevor-bird answered ·

1 Answer

Victron Energy Argo FET Battery Isolator (3 batt) - Need help!

Newbie to the forum...

I’m hoping someone can help me.

I purchased the Victron FET Isolator thinking this would be a simple task; connect the charging circuitry to the “IN” and batteries to the outputs 1, 2, 3...simple...right?? Well, I can't figure it out.

Here is the problem...Referring to the wiring diagram below...The batteries are charged by either the converter or the alternator in the engine compartment. The same wires that provide the charge to the batteries also supply 12Vdc to the 12Vdc fuse bay that powers all the 12v circuits in the coach.

The green lines in the circuit represent the original wiring one can see, the batteries are in parallel, and all connect to one point.

My goal was to avoid putting all the batteries in parallel by using the isolator and install 3 fuses and 3 switches so I could switch in/out any battery combination I wanted...including having a emergency spare.

To complicate things...the “E-Start Sol” is a momentary switch connects the engine battery to the coach batteries; this is in case the engine battery goes dead, you can start the engine from the coach batterie(s).

I can't figure out how I can connect up the "IN" on the isolator and still maintain the functionality. I'm not sure it's possible to incorporate the isolator and I might have to just connect the output of the switches to the common point like the original circuit.

I was thinking that perhaps I could find the 12Vdc outlet of the Converter and run that to the "IN" of the isolator, but then the issue is the E-Start Solenoid connection which is to connect all the batteries together...can't seem to figure that out using the isolator.

circuit to Victron.jpg

jusplainwacky asked

0 Answers

Connecting Argofet Isolator to Paralleled Battery Bank

When connecting an Argofet Isolator to a battery bank with paralleled batteries, do you use one isolator output for the entire paralleled bank, or use multiple outputs, one for each battery In the paralleled bank? On my boat, I have a starter bank with a single group 34 battery, and a house bank with two identical group 31 batteries. I’m believe I need a two bank isolator but just wanted to confirm that I don’t need a 3 bank isolator. Thanks for your help.

tcwippy asked
Sarah commented ·

1 Answer

ArgoFET and Voltage sense wire?


I have two battery banks, and want to separate them with a ArgoFET. My alternator has a voltage sense wire that i guess is used to measure the actual voltage as close to the battery as possible. To my understanding the regulator tries to keep the voltage as high as possible without cooking the battery. Where to I connect that wire? To the start battery, or the service bank?

andreholgersson asked
benm answered ·

1 Answer

89 Posts
75 Users

Topic Experts

There are currently no experts identified for this topic. Can you answer questions in this topic area? Community members who provide answers that are marked as correct earn reputation and may become recognized as topic experts.