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Orion-Tr Smart 24/12-20A (240W) Isolated DC-DC converter: External Fuses

Hello community,

Orion-Tr Smart 24/12-20A (240W) Isolated DC-DC converter: External Fuses

I am confused about external fuses required in a system with the above device.

The spec shows 25Amp maximum current under nominal operating voltage and 50Amp short circuit on the 12V output channel.


But the fuse advice in the manual is for 30 amps on the 24V channel and 60 amps on the 12V channel - surely these are too high?


I am specifying the integration of this component and am looking at advising 25Amp (24 volt channel) and 50Amp (12 volt channel)

Any confirmation would be appreciated.


andrew.g asked
Sten answered ·

2 Answers

MPPT 100/20 internal breaker

Hello all, hope this community can help.

I have a van that has all loads (except inverter) going through the solar controller (MPPT 100/20). They are properly fused with a blue sea systems fuse block and there is a fuse between the block and controller as well. Occasionally when I start my diesel heater the whole system resets. Everything blinks off for a second before coming back online as if there is some internal breaker being blown in the solar controller. No fuses ever blow. I've tried adjusting the load settings in the controller to account for any sudden voltage drop being the issue, problem its intermittent so I'm not sure if changing those settings has solved it or not. I have lithium batteries so sag should not be the issue but if I turn off everything else then usually I can start the heater without the system resetting.

Hoping you can shed some light on this issue for me. Thanks

ExpressLife asked
ExpressLife edited ·

0 Answers

The fuse blows for my second (starter) battery connected to BMV602S


We have had a Victron BMV602S installed onbord our boat for a number of years. Now the 1Amp fuse has suddenly started to blow for the second battery. The current looks very high. Any idea what it can be??? The meter says 0.11V although the fuse is removed.

GunM asked
Kevin Windrem answered ·

3 Answers

32v mega fuse compatible with 33-34v operational voltage?

I’ve got a nominal voltage of 24 for my off grid solar system but the operational voltage at full capacity will ideally be between 33-34v. Will 32v mega fuses work?

Dragon Wagon asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

Skylla-TG 24/50 Charger Inexplicably Dead

My Skylla-TG 24/50 Charger has suddenly and inexplicably stopped working completely. No lights on front when power coming in (from genset), and no charge going to batteries. I have tried to disconnect and reconnect with no luck.

Inside the unit there are no obvious places that look 'burnt out' and the fuses that I can see don't have visible damage. I've only noticed one small chip on the PCB that seems to be damaged, or even broken (see photo).

I'm assuming that a fuse may have blown, so I will try to source replacements. Other than that, do I have any other options to try before replacing the whole thing at great expense?

On a related note: is it recommended to put a fuse breaker before the power input of the charger to avoid future fuse breaks (if that's what happened)?





mbelgil asked

0 Answers

MPPT tripping breakers

I've had my system installed for ovear a year with no issues, and suddenly this started happening. (no changes to system)

So, I've got a 290 watt single panel the goes to a 30amp circuit breaker, then to my victron 100/20 mppt. To another 30amp breaker and then to a bus bar. Which goes out to the battery, fuse panel, and inverter, all of which also have breakers.

So a week ago i get in and pull up my stats and notice no solar coming in. I look and the breaker between the panel and the mppt had tripped. Well it's in a not so great place, and I thought i may have bumped it. So I reset it and everything was good until the following afternoon.

Now the breaker between the mppt and bus var tripped. I inspect all of my wiring and can find nothing wrong. I reset the breaker and move wires etc as much as possible to see if i can get it to trip. Nothing. Again works great until the following afternoon!

Is m charge controller at fault? Any ideas? My battery died due to this. And as much as I would love a valid excuse to go lithoumm, I just want my fridge to stay running.

Sorry for the long post! Thanka if you made it this far!

UrbanOverlanding asked
JohnC commented ·

4 Answers

How to mount the Modular MEGA stacked fuse holder and bus bar correctly together


I worked today the first time with the Victron stacked fuse holder and the bus bar.


I am confused how to mount the stacked fuse holder with the Victron busbar. By dismounting one "screw stack" I got the screw M8, 1 pc. of wave washer, 2 pcs. of washer, 3 pcs. of nuts.


First question: Is it stupid to think the cable itself has to be fixed in a way that it can't accidentally jump off when changing a blown fuse?

Second question: Is how to mount the whole puzzle in combination with the fuse, cable lug and busbar?

To mount it as it can be seen on the Victron leaflet, seems to me at the first idea not correct, because than it is not possible to use the cover anyway.

So I tried first to mount it on top of the busbar.


By doing so it is not possible to mount the fuse 100% horizontal, because the thickness of the washers, nuts, cable lugs are not equal so at the end the fuse is some how crooked. And I feel not sure if it is perfect in sense to get the most possible contact from the fuse to the screw - busbar - nut - cable lug. There is always as contact surface "only" a washer, which is somehow smaller as the fuse and smaller as the cable lug. And it looks with all the nuts, washers etc. in the best way of thinking strange.

Therefore I tried the version to mount it under the busbar.


With this version it looks for me quit good. The fuse has a wide and 100% contact area from fuse to busbar and from fuse to cable lug. Still the fuse is somwhow crooked and not 100% horizontal. I don't care about this really. But I wonder there might be somehow some unwanted torsion onto the fuse, itself by this. Or doesn't this matter? And when dismounting the fuse when it is blown the cable lug is loose, too and it can "jump" off at an unattended moment and cause unwanted problems ... Is this the price you have to pay when wanted to get as much contact area as possible? And still I see no way to use the cover.

As I couldn't find any answers for my question at Victron, I hope to get some feedback here.

And last question. What maximum torque I should use to tighten the nuts?

I am looking forward for your ideas and thinking how to get the best and safest way of fixing all correctly together.

Kind regards and stay healthy


DayAndNight asked
DayAndNight published ·

4 Answers

Multi Plus II 48/3000 Fuse AC-IN for on grid topology

Hi !

I'm planning the installation for my Multi Plus II 48/3000 on grid ESS (zero feed in).

The Multi Plus II is only connected with the AC-IN terminals to the grid. The two outputs (OUT1 & OUT2) will not be used.

What is the recommeded fuse on AC-IN?

From my understanding in that case max. 3000kW will flow through the wires which leads me to the assumption that 16A are sufficient.

Please give me advice.



deichel asked
ejrossouw commented ·

2 Answers

Victron Phoenix 12/375


I have a Victron Phoenix 12/375 (230V). I could not see any mention in the installation menu of it requiring a fuse on the DC supply side.

Is it required?



bigal asked
klim8skeptic edited ·

3 Answers

Correct way to fuse parallel conductors with Quattros and Lynx

I've noticed Victron often recommends using 2 conductors each for negative and positive DC input to inverters, and it's unclear to me whether each conductor should be fused separately. I'm looking at battery fuse and cable sizing recommendations in the manual here: https://www.victronenergy.com/upload/documents/Manual-Quattro-5k-8k-10k-15K-100-100A-230V-(firmware-xxxx4xx)-EN-NL-FR-DE-ES-SE-IT.pdf.

What's confusing to me is for the 48 V, 8 kVA Quattro, it recommends a 300 A fuse, and 2x 50 mm^2 conductors for each positive and negative. I believe a 50mm^2 conductor can carry 235 A, so it seems to me it's recommending to use a single fuse for both cables. This makes me uneasy though; I thought each conductor should be protected by a fuse rated for its ampacity.

So if the answer is that the two wires share a single fuse, when connecting to a Lynx Distributor, does that mean that I would be fixing both conductor terminals to a single bolt (1 of the 4) on the distributor?

Thanks for your help.

Jonathan Lee asked
Stavarda commented ·

4 Answers

what is the correct fuse size for a 24/5000/120 multiplus

Good morning all. I have a multiplus 24/5000/120 going into a battery protect 220 then into a 300 amp fuse and then into a Tesla 5 KW battery module. Maybe I'm doing the math wrong but as I understand 300 amps x 24 volts should be good for a 7200 watts?

If I over load the AC side of this unit, will that cause the issue?

Next question... Is the 220 battery protect adequate for this setup?


bruce32466 asked
Justin Cook - Bay Marine Supply USA answered ·

3 Answers

Output short circuit protection on IP65 12/15 charger

How good is the output short circuit protection on an IP65 12/15 charger? Is it necessary to add a fuse on the 12v DC output side?

Rob James asked
Justin Cook - Bay Marine Supply USA edited ·

1 Answer

Double pole breaker?

According to install manual, a DOUBLE pole fuse/breaker is required on the AC input to a 12/2000 multiplus in a 30 amp circuit. Is this correct? Or could I use an inline fuse?

Davis Kyle asked
Justin Cook - Bay Marine Supply USA answered ·

2 Answers

Mega and ANL fuse specification


Is there a document describing the blow speed / excess current relationship for the different Victron fuse types?



eliott asked
Justin Cook - Bay Marine Supply USA answered ·

1 Answer

Orion Tr 48/12-20 fuses


The manual of the device says that "48V models don't have input fuse, external required". However manuals doesn't specify the fuse sizes or max input current whatsoever.

Output amperage should be max 20 Amps so the fuse on the output should be around 25A as I understand.

But what size should be the input fuse?
Counting from 240W by 48 V the amperage should be 5A. Considering the losses in the device, the max input current could be little higher. So would 7,5A fuse be correct size?

Arctic SeaCamel asked
Arctic SeaCamel commented ·

1 Answer

Fusing Smart MPPT 75/15

My Swift Conqueror 2016 come factory fitted with a Sargent 80w mono solar panel to a Sargent PWM controller the to a Sargent EC600 system ( which has a 6 amp polyfused) and fused at the fuse board.

I have now fitted a Victron Smart MPPT 75/15,

(a) I have noticed the solar panel to the original PWM controller is not fused, Do I need fuse this circuit.

(b) I am going to upgrade (as advised my member on this site in a previous post) the wiring from the Victron MPPT 75/15 as I plan further upgrades. I have already fitted some busbars, do I fuse the circuit from the MPPT to the busbar at the MPPT or just near the busbars.

Oscarmax asked
Oscarmax answered ·

2 Answers

BMS 12/200 Max fuse spec

On the recent Blog post, Jono shows the BMS 12/200 with a 200amp fuse across AB. Victron spec sheets indicate 100amp fuse maximum. I do not have enough info on how or why this is OK @Jono (Victron Energy Staff)

rodney abbott-buchanan asked
Sam Salwei answered ·

2 Answers

Fuse for AC in on Multiplus 48/5000?

Had a power surge from grid a while back and this then required a new control board to be fitted. This has been done and the inverter side works fine now but when connected to AC power in, this does not register and charge the batteries or switch the inverter side off. There is none of the LED operating on the left side of the unit either? Having looked at documentation it is telling me that it may be a fuse/breaker on the AC in side that needs to be closed, any ideas where?

TonyR asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

SmartSolar MPPT 100/50 - fuse blowing between controller and battery

I have four 12V 140 watt solar panels wired in parallel that have worked for 5+ years on my former Blue Sky controller. I want to switch over to Victron so bought the SmartSolar MPPT 10/50 and move the four wires (two PV and two Battery) from the Blue Sky to the Victron. Everything came up and my VictronConnect app showed the panels charging. After 10 minutes my 50 amp fuse between the Victron the batteries blew. A replacement fuse blew instantly. Perplexed because I did not change any wiring - just moved them over from the old controller to new. I've rechecked my wiring and did not accidentally reverse any.

sailaway3662 asked
JohnC answered ·

2 Answers

I overloaded 12/800 it alarmed. I reset, then did it again. No lights now. Internal big fuse is unbroken.

I tried resetting a few times. I charged batteries for not very long and reset. I will check in engine bay for breaker and check fuse, not done yet. But wondering if anyone has any other suggestions? Many thanks

AnnaBanana asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Esaysolar need external fuse online cable

Hi, i've opened my easysolar to connect the differents wire and i see a 200Amp fuse. On the documentation (Multiplus 48/5000) i see i need a 200 amp on the cable between EasySolar and batt. Is it usefull ? Or just a redundancy ?

Lambish asked
WKirby commented ·

3 Answers

Blue Smart Charger not charging battery, how to change fuse?

Hi, I have a blue smart IP22 charger 12v/30a.

The charger isn't showing any signs of voltage, and it does not charge my battery. When plugged into the mains power, the charger starts up, and I can connect to it via Bluetooth. Just no dc power output.

I've tried a few different cables, no dice.

I tried to take out the fuse by just pulling it, no dice.

I tried to unscrew the screws next to the fuse blade that I thought was holding the fuse in, the screws just spin in its place and not actually coming out. No dice.

What do I do to actually replace the fuse, or know anything else to try?

Cyanogenic asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Mega or Class T fuse for Multiplus DC supply

I’ve seen conflicting information for protecting my 3000W Multiplus inverter, in Victron’s system guides they show a Mega fuse. Many installers recommend a Class T fuse.

Does anyone from Victron have a recommendation for which fuse type is best to protect the Multiplus DC input?

AirstreamSolar asked
kai edited ·

2 Answers

Parallel wiring of Lifepo Batteries

I would like to install 3 of the new 200Ah Lifepo batteries in a parallel setup. The Documentation asks to have each string fused per battery. Usually i would go for simply interconnecting the batteries with well dimensioned short length cables and have one fuse for the complete battery bank. The simple way would save me space, save transition resistance, less failure points etc.

Is there any special reason to have each battery fused individually or is it "just" the way of the very lowest risk.

Any advise is appreciated :-)

EDIT: @Margreet Leeftink (Victron Energy Staff) Four posts later your awesome handbook got posted. Maybe you might pick up my question in this in any future release. ;-)


hkettler asked
hkettler edited ·

3 Answers

Orion 24 v to 12 v 70 amp fuse size on the 24 input side

I would like to fuse the dc to dc converter on the bus bar, at the battery box. What size should I fuse it at ?

jaman asked
jaman commented ·

1 Answer

Skylla-TG blown fuse

The circuit board in one of my Skylla-TG 24/100 has a blown fuse. It's hard to access on the board and so far no luck extracting it. A - is this typically replacable/ known issue. B - can the entire board be replaced?

rhroberts asked
rhroberts commented ·

1 Answer

I have a 100/30 charge controllerover voltage errors for 5 days.. Can it be fixed in phoenix az

I have a 100/30 charge controller that was showing over voltage errors for 5 days...100.3 - 102 volts.I added a 5 watt resistor to lower the no load voltage condition on the panels. There is now no output from the controller. It shows 97 volts from the panels and the batteries at full float. I have four panels on my RV and a 2000 watt Trace inverter / charger with it's own controller. I think I may have blown the internal fuse. Is there someone in Phoenix, AZ that can fix it? I just bought this controller in August of this year.

Timaz asked
Guy Stewart (Victron Community Manager) answered ·

2 Answers

Guidance on Multiplus II 3000 fuse and wire for Pylontech batteries


Little confused about battery wire requirements and fuses for using the Multiplus II with Pylontech batteries. It would seem that you have to use Pylontech branded cables as the batteries have a proprietary connector on one end to go into the battery. I can see in the manual it recommends 35mm2 cable and a 125A fuse. My dealer gave me a 200A fuse, I read on here, someone else had their distributor give them an 80A fuse. Confusion number one!

Confusion number two, I can't see what the cables provided by Pylontech are in terms of thickness, there doesn't seem to be a rating on them. But like I say, they have a special connector on them so it would seem you have to use them? Confusion number two!


Then finally, I have seen two installers here in the UK, who don't have a breaker, isolator or fuse on their installs between inverter and battery. Mind you, one of them also puts the batteries below the inverter, which the manual pretty clearly says not to do! Confusion number three! See pics.

Any help advice, particularly from someone who has Pylontech batteries would be much appreciated.

Many thanks,




garethcurtis asked
Tommas answered ·

3 Answers

Does Victron 2000/80 multiplus need an in-line fuse to battery

Looking inside the unit there is a fuse on the power connection. In the manual there is no mention of needing the 300 amp fuse. However if you look at the manual online it says you need a 300 amp fuse. I am assuming I have a newer model that now has an internal fuse and the manual online is outdated. Does anyone know If I need to put a fuse in the power line to the battery?

Kaplan78 asked
WKirby answered ·

1 Answer

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