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Fuse connecting MPPT 100/30 solar charge controller to batteries in lynx distributor

I have a Victron MPPT 100/30 solar charge controller and I’m trying to fuse it in my victron lynx distributor before if connects to the battery. I cannot find a 30 amp MEGA fuse to connect fuse the solar charge controller at the lynx distributor. Is there such a thing as a 30 amp mega fuse because I cannot find one or what should I do to fuse this solar charge controller properly at the lynx distributor?

camkelly asked
seb71 commented ·

1 Answer

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.


andrewg asked
radman edited ·

3 Answers

BMS 12/200 really 200?

Designing an all Victron Li system for my Sprinter van. I have a 220 amp alternator and while I know that I may not be able to use half that for charging my house system, I want to be able to use as much as the system will allow. So I got a BMS 12/200 thinking it would allow up to 200 amp charging. Now I see that the input (AB) is limited to 80Amps when using a 100 Amp fuse. That's still a lot, and maybe more realistic about what I can expect but still not 200. It seems installing a larger fuse would allow more, but elsewhere it says this is limited to 80 amps.

And nowhere do I see a table of fuses I can use on the LB side. I have the multiPlus 12/3000 and other loads on the LB side - I want to put a big old fuse in there but how big?

doclayton asked
doclayton answered ·

2 Answers

SmartShunt 500A Red Wire Fuse Information

I blew the small glass fuse that goes in the red power wire for the SmartShunt 500A. Finding a replacement is proving difficult. I can't believe the fuse information isn't cited in the manual. Stunning omission. Between my smartphone & a magnifer, I can read some information off the fuse, but when I type what I see in a search, I'm not sure I'm finding the correct replacement.

Anyone been there & done that?

Victron - what the heck were you thinking by not including that information??

victronlfs asked
Matthias Lange - DE answered ·

5 Answers

Help a budding solar enthusiast please ! MPPT/Charger Related



Thank you for your time in advance, Setup is for an Electric van with a fridge unit, with PV power to top up batteries.

- 2 x 115W PV panels in series (40A inline fuse) after MPPT before DC BUS

- 1 x MPPT 100/30

(both those elements wired to bus bar) 150A

Connected to Bus bar is

1 x Fridge unit, which draws 50/70amps when under load, with built in 100A / 12V charger system, to charge batteries. Fused at 125A as shown.

1 x Smart Shunt (all negative loads pass through)

2 x212AH 12V Lithium batteries in parallel


- When the 12V charger (rated to 100A) charges the batteries, the charging current is flowing through the whole circuit. What stops the 40A fuse on the + line of the MPPT not blowing, or will it blow ? as current passes through the MPPT as it will happily give voltage of the battery etc.

What can I do, is there a risk of 'back current' or similar, as I am worried, that when I will blow the fuse before the MPPT when I turn the charger on.

I have done a similar setup before where I have not fused the MPPT, but I understand its best practise to do so.

Thank you

next-day-solar asked
next-day-solar commented ·

1 Answer

Will the Fuse LEDs on Lynx Distributor illuminate without the 4-pin cable supplied with unit?

Trying to use the Lynx Distributor (and Power In) without the Lynx Ion Shunt or BMS (using BYD batteries). I had assumed the Fuse LEDs would illuminate with a working fuse in place and powered, however a line on the old Victron Live page for DC Distribution Systems suggests that this small data cable is used to power the LEDs (rather than taking power from the busbar itself). I cannot get the LEDs to illuminate - are the LEDs useless unless using the Lynx Shunt? Because Lynx Shunt uses CANbus, it cannot be used in conjunction with BYD on a CCGX (though I think VGX would support it).

midsummerenergy asked
sharpidea answered ·

4 Answers

MPPT Bluesolar 150/85 no charge current incorrect display

Good afternoon

My Bluesolar MPPT 150/85 ceased correct operation after a small short on the pv side (unfortunately between PV panel fuses and MPPT )

First it showed a warning "inf 21 " then after complete discconnecting no more error messages but now

- current reading is 0 A , but PV current seems to be simply passed through

- measured current from PV is 7 amps ( cloudy ) and output current is exactly identical

- Voltage on panel is battery voltage + approx 0,7 V

- No MPPT function -

Is there anthing likee a fuse or so ?

Anything I can do ?

drjs asked
gdam answered ·

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
tdcgoofy answered ·

2 Answers

Fuse needed for the MPII 5000/48V and Pylontech batteries

Im trying to find out the fuse needed for this schematic that I want to install in an off-grid


I would install 4 2.4kW Pylontech batteries.

The MPII manual suggests to install 200A fuse but I think it might be too much for this?


tpwchr asked

0 Answers

Should I add extra fuse to SmartMPPT75/15

The SmartSolar MPPT 75/15 has a build in fuse. But what does it secure, and should I add an extra one.

Is it securing the Battery, or the Load. And does it make sense to add another one?

The load would go to my distribution panel (formerly connected to the hitch) and has a fuse of itself. Of course I would add a fuse as close to the battery itself as possible, but the MPPT is like 40cm away from it, lead wise.

I am assuming putting a fuse on the solar panels would not make sense. Yes, I can short them, but I would want it to be able to deliver its maximum capacity without blowing, and it seems silly to add a fuse for more Amps then the Solar can deliver.

cybermaus asked
cybermaus answered ·

2 Answers

what happens if the fuse blows ? 75/15

If the fuse on my mppt 75/15 blows are my panels still putting power into the controller ? I know that the 20 amp fuse is on the battery output and i know i should connect my battery before the solar panels so what is the fuse blows ?? will the output from the panels damage the controller ??

munromobile asked
jeroend answered ·

1 Answer

What fuses used in a Multiplus 24/3000/70-16?


I am using a Multiplus 24/3000/70-16 in my motorhome and I'd like to carry some spare fuses for every fuse build in. So before starting to disassamble the device and find out myself, could you tell me what is a complete set of spare fuses needed.



mibarmbek asked
casey commented ·

2 Answers

VE.Bus BMS System on/off switch & fuse

Hi there,
In the VE.Bus BMS manual, the installation diagram for a Multiplus shows a
"System on/off switch" connected to the Battery + on the BMS
And it shows a fuse connected between the switch and the battery positive terminal
I have circled them both in green below:


I am wondering, for a 24 system:
* What would be appropriate gauge wire for these connections
* What would be an appropriate switch for this connection
* What would be appropriate fuse for this connection

Thank you in advance :)

offgrid asked
Matthias Lange - DE answered ·

1 Answer

Quattro and Fuse/Circuit Breaker replacement

How Change Fuse/Circuit Breaker in Quattro 3kw on AC1-Out?

Question: I have a 220v boat with 3kW Quattro. I recently experience a power surge from my shore power and now I can’t get shore power on my boat.

The manual seems to suggest that when one has an overload situation and Charger is not working, one should replace fuses/circuit breaker from AC1-Out or AC2-Out. However, the manual does NOT specify how to change them or how to locate them ( which fuse is for AC1-Out and which is for AC2-Out.

Background: My shore power comes in via AC1-In and my Genset comes in via AC2-In. I know that manual stipulates Genset should be on AC1-In and AC2-In is for shore power. The previous owner installed Quattro and it works so I didn’t change it. We had no problem with Quattro until now.

After the power surge, the inverting function of Quattro still works and Genset charging via AC2-In also works. However, the shore power does NOT.

Our actions: We disconnect the AC1-In wires (ie live neutral and earth) and did voltage test and we saw 240V so we are confident that current flow from the dock to Quattro. However, once we connect the 3 wires back to AC1-In, no shore power.

We even move the 3 wires in AC1-In (Shore Power) to AC2-In Connection and still no shore power.

We also move 3 wires in AC2-In (Genset) to AC1-In as stipulated in manual. We were surprised to find when we did this, Genset also CANNOT charge.

Once we moved Genset wires to AC2-In connection then Genset can charge the battery and produce 240 AC for the boat.

Based on above, can you confirm that:

1) Is changing fuse/circuit breaker on AC1-Out is the right remedy?

2). If so what is the procedure to locate and change the fuses? What are the proper fuse size? 250 ah? (3000watt/12V).

ourrose asked
Kevin Windrem answered ·

1 Answer

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
lazy-bones answered ·

3 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
Rob Duthie commented ·

4 Answers

victron 175w mono SPM041751200max fuse rating /reverse current

SPM041751200 victron

looking for the max fuse rating of these panels if anyone can find it I have searched internet with no result.

using 3 x 175 wired in parallel in a small system

sunshine asked
sunshine edited ·

0 Answers

One or two fuses?

Hi Everyone,

The Quattro 10000KVA manual recommends x2 50mm sq wire and a 400amp fuse. Is that 2x 200amps or 2x 400amps?

As background, the 2x 50mm sq is equal to 2x 1/0 AGW. A single 1/0 can carry 150amps, so two pieces equals 300amps.

fideri asked

0 Answers

SmartSolar MPPT 75/10, 75/15, 100/15 & 100/20 Fuse Purpose

Hello, I have the SmartSolar 100/20 and am wondering what the 25A fuse built into the unit is protecting. I assume it's not for the solar input since that current will vary greatly depending on panel type. Is the fuse in line with the battery connection or the load connection? I plan to fuse the panels, load and battery connection, but don't need to be redundant since it seems like either the battery or load connection is already fused.


Followup question, the manual says on page 11 for the 75/10 and 75/15 model it says that the "automatic load disconnect" and the "continuous load current" is 15A. On page 12 it says that continuous load current is 15A for the 100/15 and 20A for the 100/20. That all makes sense, But then also on Page 12 it says for the "automatic load disconnect": "Yes, maximum load 15A resp. 20A". I would have thought it would have a separate column for the 100/15 (15A) and the 100/20 (20A) I would assume that the resp means 20A for the 100/20 version but you know what they say about assuming... On the temperature compensation it also uses "resp" but that is referring to 12 or 24V, want to make sure that the load current on the 100/20 is not voltage dependent.



benbrand asked

0 Answers

Victron MPPT 100/20 fuse keeps blowing


I got the MPPT SmartSolar 100/20 controller a few weeks ago and have so far tested it with solar panels and lead-acid batteries, both in 12V and 24V configurations, and everything's worked fine.

Now however I just got a LiFePO4 battery, 8 cells connected in series for 24V but when trying to connect the battery to the controller (no panels or anything else connected) I get a strong spark and then the controller's (25A) fuse blows. Batteries seem to work as they should, showing voltage of 26.16V. I haven't tried connecting any loads yet.

What could be the issue here? And what should I do to troubleshoot?

sco asked
rickp answered ·

3 Answers


I will be adding my solar panels this weekend to the boat and want to check where I should have fuses.

At the moment the wiring from the 4x 150W panels will be 2x parallel then the 2x parallel in to series before going to the Victron MPPT 150/60 via MC4 connections. Should I have a fuse on the +ve input to the MPPT? There is then a 32A DC DIN Mount Breaker 125V MCB C curve on the +ve going to the batteries.

Secondly i’ll be putting an ET-112 from my onboard generator to give me power info to my Venus GX (no multiplus or Quattro onboard) I see there is a fuse to go on the neutral side of the ET-112 but it doesn’t say how much it should be, the generator is a Paguro 4SY, that puts out 3.5KW @230V.

bora asked
njordan answered ·

2 Answers

what size fuse/breaker between mppt and solar panel?


I have a Victron 150/45 MPPT with a 500w solar panel.

I am using 6mm2 cable as specified in the manual. That's suitable up to 50A.

The MPPT is 45A.

The fuse should be above normal current draw but below cable size - so between 45A and 50A!

What size fuse/breaker should I use? Or should I use bigger wire than the manual specifies so I can use a 50A fuse?


missy asked
Justin Cook - Bay Marine Supply USA commented ·

2 Answers

EasyPlus Compact 12/1600/70 - Fuse Size

Hi All

Can someone confirm the correct fuse size to use ? I am thinking of using a 150A fuse.

My logic is -

When charging - the max it could throw to the batteries is 70A. When inverting the max it could be pulling from the batteries is 1600W / 12v = 133A plus about 10% = 150A.

So a 150A fuse would cover charging and inverting.

Thoughts ?



miya asked
JohnC answered ·

1 Answer

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

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