Thank you Jahannes. That is a great help. I will assume the same on the Non-NG which will help with project planning. It is good to stay up with the latest knowledge and keep it all as safe as we can. Regards Dave and Magda at Akupalma (MMAS)
can a mutiplus 2 3000va 24v be parallelled up to a easysolar 2 3000va 24v even though one has a cerbo controlloing it and one has its built in gx device thanks in advance
theoraticly yes but this requires changing the internal wiring , so I would advise not to do so and go for a Multi GX plus a Multi and a stand alone Smart MPPT charger
I've got two easy solar linked together 3000va 48v, as already said above you need to change the internal wiring and both pcbs in the multi's need to have the same series or product no to make sure they are compatible, both of mine have GX screens, only one can be used, there isn't a lot of extra space inside the box, I haven't had any issues since they were installed 5 years ago.
Can the new Lynx class T(M10) be interconnected with de Lynx Shunt (M8) by making the holes on the left side of the Lynx Shunt bigger to fit the M10 on the Lynx Class T? Would this be safe and work properly? Is there a Lynx Class T in M8 version planned for the future? Thanks in advance
@@johannesboonstra6917one more question: I would like to connect 2x 12v 300ah lifepo4 to the Lynx Class-T, each battery with its own fuse. But I would also like this batteries to have its own disconnect in case of service needed or replacing one of the batteries (so the other one that is not been replaced/serviced can be still working) I have read the ideal connection would be Battery-Fuse-disconnect but what I want to do it’s only possible by battery-disconnect-fuse Would this be safe and recommended to place a Disconnect between the battery and the Lynx Class-T? Thanks in advance
If you allready have an m8 lynx system, is it possible without drilling to upgrade to the m10 t fuse lynx with an adapter? Or will that be soon on the market?
AC ? well thats a different game, we have energy meters for that (not a 1000A busbar), for DC loads we have the smart shunt, small and elegant (and very accurate)
@@johannesboonstra6917 At this connection point, it's protecting the battery and up to 4/0(120) battery cables from a SS. This device can handle max 4/0(120) In ideal conditions the max ampacity of copper is say 445 amps while the US NEC puts it around 260@90c, less if cables are in wet conditions@75c max. So this puts us in fuse size 250-400range. Depending on blow characteristics of the fuse size of 350amps might keep us from exceeding 445 for any extended period. Not counting derating due to high ambient, multiple conductors, or insulated cable placement. So why care about more expensive harder to get T-fuses, unless there are some standards that require them at these amperage? I like the integrated nature of the fuses, but at 2 connections per device, I'm failing to see an advantage. The M10 connection is good for the surface area. I've always wondered if I could take a power distribution device, move to left of the shunt, hook up to 4 batteries there with fuse size up to 500amps, and nice lights to tell me when one blows. Then put another on the right side of the shunt for loads. This gives me 4 mega fuses on each side. Not suggesting this is a supported or intended configuration, but it felt useful to me. This is why I feel I'm missing something here. I'm great with safety, correct sizing/fusing as death by electrical fire is not high on my bucket list. Always seeking to learn.
After posting, went and read the lynx distributor manual. Was pleasantly surprised to see it is supported to use it for mega fused battery connections. I may have missed it but could not find a max cable size in the doc, or if the M8 or M10 versions supported different sized connection cables. Which leaves wondering why I want T fuses? I don't know much about mega/T-fuse blow characteristics or if they are similar to breaker A-F rating curves? I'll keep my batteries close to power distribution, but some may have longer cable runs that need protecting. So I'm scratching various body parts wondering about this new device, and how I would deploy one vs the 4 connection mega fuse device?
@@johannesboonstra691799% of the batteries don't show the possible short curcuit current in the manual. Victron has to also account for that Lynx is not only used with their batteries. In short megafuse should be never used with lithium batteries, as exception you can use them till approx 200AH batteries. I always use NH fuses, which also works as disconnect switch till 48V systems as you can pull it even under full load. Means 2 connections less (=less failure points and less voltage drop) and money saved for disconnect switch.
Always use class T or NH fused with lithium batteries, the very small till 200AH a megafuse can be used but shouldn't. Instead class T use NH fuses, much saver as 50-80kA short curcuit protection and avaliable in all characteristics, not only superfast which is actually too fast as battery protection if you eg use your lithium also as starter due to high surge loads. The battery can do it but the class T not and need to be oversized which means now your continuous overcurrent protection is now too high. NH fuse in GG fast is correct choice here, as it has the correct continuous overcurrent protection as well as the peak on for the surge starters or bowtruster or windlass creates.
QQQ. 1:58 if I have 6, 12 V 100 amp batteries and what you’re considering “two strings”you’re saying I need two class T fuses 😮 Why can I not just put fuses directly on each battery?
You need 6 fuses, one for each battery. Being 100AH you can use MRBF fuse directly on the terminals BUT only because they are 100AH ones, each battery must also have a disconnect switch so you can isolate the battery. Means 6 times fuses+disconnect switch...better use 2x300AH batteries and you only need 2 fuse+switch+cables+lugs...less failure points, less volatge drop plus spend more on capacity and less on install equipment. Always use the biggest capacity lithium avaliable that fits in your space and if that's not enough fit a 2nd/3rd....one till you reach capacity you need.
i appreciate the increase from M8 to M10, as M10 has significant larger contact surface (+60 to 80% larger surface) will you offer conversion kits for owners of the "old" Lynx? I mean kits to convert the plastic inlets to house m10 screw heads Cheers Michael
I am just looking through the specs on victron batteries and can not find the scc stated for the different models. Is there a list so we can correctly configure a system? as i understand the class-T can handle up to 20k AIC, MRBF fuses can handle up to 6k AIC, but i am unsure what rating the standard mega fuses are, and are the 32v megafuses rated different to the 58v on AIC?
For the NG models the list of minimal and maximal short circuit are listed below, would that help you ? 12,8V-100Ah 1500 3500 12,8V-150Ah 3000 5500 12,8V-200Ah 3000 7500 12,8V-300Ah 6000 11000 25,6V-100Ah 1500 3500 25,6V-200Ah 3000 7500 25,6V-300Ah 6000 11000 51,2V-100Ah 1500 3500
Hi I have three Victron Lithium Battery Smart 12,8 batteries, each wired separately to a Lynx Distributor. Each one has a 300 amp Mega Fuse. I had my installation reviewed by someone who installs allot of Victron systems on boats. He suggested I replace my Lynx Distributor with a Lynx Power in, and install a 400 amp Class-T fuse on each of my three batteries. He the Mega Fuses could arc and melt into a solid connection. Do you think I should do this? Is this good advice with stand alone batteries?
Thanks for this demo. Are these Class-T fuses are compliante with Pylontech and Seplos (DIY) batteries ? Or do we still have to continue to use NH fuses ? Thanks.
@Victron Energy - it would be nice to have a Lynx X in the Product Range - so you can Switch Inputs Upside Down. Especialy on ESS System's from Top you came down with the connection from the Multiplus - from the Buttom you came from the Battery's 🙂
@@donalexey the fact that there are priority elsewhere, therefore its not happening soon I am afraid. its always about making choices what to do first..
Only 2 class-T fuses makes it a lot more expensive and an extra unit provides also an unnecessary extra connection in your busbar system. Is the production of a 4 channel Power-IN in sight?
Depending on your application, you should be ok to connect pairs of batteries using standard diagonal parallel cable connections. Then connect each pair to a class-T fuse. This will let you connect 4 lithium batteries
Use NH fuses instead, they have 50 till 80kA AIC, are cheaper and saver. Also no knock offs are avaliable. The heat distrubuted by these fuses also show their high resistance means voltage drop is bigger with class T then with NH. A 3rd issue with them is they are superfast so if you have high peak draws like starting engine from your main house classT must be oversized otherwise they blow due to surge but that means your overcurrent protection is too high. Another reason to use NH as they are avaliable in all characteristics you need. You actually wanna have GG fuse means fast acting as they allow much higher peak currents which your lithium bank can deliver savely. 4th the lynx distributor is rated for 1000A but only carries a 8mm x 30mm busbar in it which is rated to 418A till 478A depending on which busbar calculator you use, so how does victron get to a 1000A rating here....I pulled 550-600A over 20min over it and the case started to deform because getting too hot means the rating is simply not correct as the busbar calculators show. All correctly installed and torqued down, no bad connections or crimps. With NH3 all stays handwarm at that load.
My victron requires a 600A fuse coming from the battery’s,can this working with 2 300A t- class fuses, i ask this because i have 3 battery banks from 48V 608 Ah and will connect them to a busbar but every bank separately have a breaker from 125A for redundancy and maintenance
3x125A (475A) is max system current, system will work using 2x300A of course, but those fuses will never go open as those smaller 3 (125A) will go first. Also, if you're batteries are 608Ah max, I would use 400A main fuse (2x200A will do), still alowing each bank to pull 125A but in total it limit max battery SC current to 400A thus saving battery life span. Always mind fuses thermal properties, how long they could take max current before meltdown... good luck.
I’d like to see a Lynx style component with: 1) 1 Class T fuse slot (sized for up to 400A), 2) A 500A rated shunt, 3) A manual battery disconnect switch (rated to at least 400A). All in one. Retail price target: $300-400.
I have secured my rather small setup (200Ah) with a Victron 100A Mega-Fuse. Now I saw a video where somebody tested such a Mega-Fuse and found out that they not melt at a bit more current than 100A but melted at around 16 minutes at 250A. Since than I am unsettled if my system is safe because my cable diameter is not capable of 16 minutes 250A. My van would burn. My question: Can I be sure that Victron megafuses really break at that current which is printed on? Can you proof that in a video where you test numerous Mega-Fuses? That would calm me down... Are Mega-Fuses reliable? Are there other fuses also for smaller systems which a definitely reliable?
Victron is not a company that is known for making crap (but I don't believe they making own fuses), so you're safe as you can be. Nothing is 100% reliable. Any fuse has rating, maximum load at ambient temperature and how long it can take it, close to maximum load and time delay factor (how long it takes to open). More on this you can find in datasheet regarding megafuses. If it would be my van, I would ether raise system voltage (lets say from 12VDC to 24 or higher) or split power to 4 banks using smaller inverters thus fuses. I'm not fan of crazy large current over low voltage. Also, mind to always use DC-DC wherever is possible instead going DC to AC than back to DC, like using 110/220VAC laptop charger to power laptop in a DC loom, use 12VDC to 19VDC (if that what laptop is rated for) boost converter, it's much more efficient. Good luck.
Your characteristics of the fuse is wrong, you need a superfast acting one. You have a slow or fast acting model, that's why it's allowing you significantly higher and longer peak currents. Also your cable can carry shorttermed significantly more current that it's rated for. How big/diameter is your cable?
I only use NH fuse with lithium, safest fuses avaliable as 50-80kA short curcuit interrupt current, are avaliable in all characteristics (not only superfast like class T) and have the lowest voltage drop. You also spec them to 100% and not to 125-130A as with the other fuses as they are made to run at max rating for 14/7/365...your megafuse not.
Mind if you diy drill M8 to M10, any imperfections in contact surface, like pitting or burr, will induce drastically more junction heat rendering M10 less current capable than M8.
What is considered a large battery bank system? I have 3 24V 200Ah lithium batteries wired in parallel via a Victron Power-in powering my Multiplus 24/3000/70 2x120. Would it be considered large?
I have a similar question I have six 100 amp powers at 12 V which I believe is the same as what you have in 24 V. And I have mine in two groups of three… So I need two, class T fuses?😮😮
I also have 3 25.6v/200Ah Smart Lithium connected to a Lynx with 3 Mega Fuses (24v system). The spec sheet does not show max short-circuit. Should I be looking at Max Continuous Discharge? For these batteries, that is 400A, which appears to be within range for the Mega Fuses. And, since I have 3 batteries, I'd need 2 of the new Class T modules. Believe I'm OK with the current configuration.
M10 vs M8 doesn't do anything in terms of current capacity, except possibly lower it, but I haven't done the math on that. However, the M10 bolts make a more secure connection, which is nice when the project calls for four, five, or more Lynx products in a line. The bigger issue is that the advertised 1000A continuous capacity of the buss bars is not even close to correct. Measure the buss bars inside the Lynx and do the computations OR use any of the copper buss bar calculators on the web and you'll see that 500A continuous current is about the max before heating issues arise. 1000A continuous across the Lynx system can actually melt the plastic surrounding the buss bars. That means in large systems with many large inverters you cannot put your batteries at one end of the buss bars and loads/sources at the other. This also means building very large systems with Victron batteries is difficult since the VE batteries require an external battery monitor (i.e. the Lynx Smart BMS or Lynx Shunt) and that battery monitor is limited by the current carrying capacity of the buss. Doing so with eight Quattro 10kVA inverters and thirteen MPPT RS 450/200 (one of our recent projects) means interleaving the batteries, loads, and sources across the buss bars to keep localized currents within the bounds of the 500A continuous capacity of the Lynx system. This is very doable, but requires using multiple standard Lynx Power Ins with smaller class-T fuses (for each battery string) and MEGA fuses (for sources and loads). This is how integrators have been doing larger systems for years, though it's not supported by Victron. Alternatively, use batteries with communicating BMS's along the DC buss to avoid having an external battery monitor that is a choke point. This is the approach our Victron reps have suggested. For 90% of Victron installations the Lynx system is just fine and you don't need to worry about batteries on one end of a buss and the sources/loads on the other.. But if you're building larger systems then you need to take into account the limitations of the Lynx system. We still prefer to string together multiple Lynx PowerIn since it gives a neater look than custom buss bars. It just means interleaving all the sources, loads, and batteries evenly along the buss.
Absolutely correct. This is why all gear has ambient temperature ratings, like 20*C or 68*F (NIST standard) current rating means, no matter how hot buss bar gets, ambient temp still has to be maintained to those 20*C rated aka forced cooling should be used. Back in a days we had RMS or continuous ratings which meant 100% duty cycle, which further meant if it's rated 1000Amps it will endure that load throughout entire lifespan of a product in acceptable temperature range, like commercial 0:70*C, industrial 0:125*C or military -55:125*C which is today reserved for very narrow product range...
I just had a look on the total internal resistance of a real-world 60kWh battery bank that I recently built (under optimal conditions, battery temperature slightly below 30°C). On a 140A sudden load change, the voltage is reacting with a delta of 0.4V, as seen by the Multiplus, all wiring, breakers, fuses and DC distribution included. Hence the Ri of the whole battery system is only 0.003 Ohms. Assuming 56V, this could result in a short-circuit current of whooping 18666A or almost 19kA!
@@JohannesBoonstra-ol2nz Yes, two strings of two battery modules paralleled externally on each Class T fuse (additional breaker within each battery module), with rather short wiring 70sqmm. The planned/calculated/expected Ir was bit higher, though. 
Compliments to mr. Boonstra as it's takes great skill to be able to talk 3,5 minutes about something that's so obvious and already on the market made by same company... and yes, speaking about connections, bigger is not necessarily better, M10 bolts could handle less current than M8 if metallurgic is wrong, for example golden plated M8 has less contact resistance than M10, or even M16 in stainless steel, means there more room for developing "new" models...also, loom SC current should be less than battery internal SC current as no engineer would suggest to drive batteries to their 100% current capacity. Mind that I know Victron is among greatest companies on the market.
Those contemplating using this T class Lynx for marine installations should be aware that the ABYC regulation for the maximum distance between the Lithium battery positive terminal and the fuse is no longer than 7 inches in order to protect the cable! It seems more feasible and safer to just use 2 Class T fuse blocks.
Thank you Jahannes. That is a great help. I will assume the same on the Non-NG which will help with project planning. It is good to stay up with the latest knowledge and keep it all as safe as we can. Regards Dave and Magda at Akupalma (MMAS)
can a mutiplus 2 3000va 24v be parallelled up to a easysolar 2 3000va 24v even though one has a cerbo controlloing it and one has its built in gx device
thanks in advance
theoraticly yes but this requires changing the internal wiring , so I would advise not to do so and go for a Multi GX plus a Multi and a stand alone Smart MPPT charger
I've got two easy solar linked together 3000va 48v, as already said above you need to change the internal wiring and both pcbs in the multi's need to have the same series or product no to make sure they are compatible, both of mine have GX screens, only one can be used, there isn't a lot of extra space inside the box, I haven't had any issues since they were installed 5 years ago.
Can the new Lynx class T(M10) be interconnected with de Lynx Shunt (M8) by making the holes on the left side of the Lynx Shunt bigger to fit the M10 on the Lynx Class T?
Would this be safe and work properly?
Is there a Lynx Class T in M8 version planned for the future?
Thanks in advance
Yes that would be fine
@@johannesboonstra6917one more question:
I would like to connect 2x 12v 300ah lifepo4 to the Lynx Class-T, each battery with its own fuse.
But I would also like this batteries to have its own disconnect in case of service needed or replacing one of the batteries (so the other one that is not been replaced/serviced can be still working)
I have read the ideal connection would be Battery-Fuse-disconnect but what I want to do it’s only possible by battery-disconnect-fuse
Would this be safe and recommended to place a Disconnect between the battery and the Lynx Class-T?
Thanks in advance
@@currocampos2072 it should be ok, the fuse will protect the whole systems still.
@@kapokee thank you
If you allready have an m8 lynx system, is it possible without drilling to upgrade to the m10 t fuse lynx with an adapter? Or will that be soon on the market?
There is no other way to drill I am afraid (beside swapping for a new Lynx of course)
Would you consider to make a larger Lynx shunt VE.Can with space for a class T- fuse?
Maybe with an additional battery switch included?
there are many ideas on getting the range more useable then it already is, but time is the restraining thing here. Thanks for your suggestion!
Please fix the Lynx shunt so it will read DC and AC properly. Also when are you going to make a cut-off switch for the Lynx system
AC ? well thats a different game, we have energy meters for that (not a 1000A busbar), for DC loads we have the smart shunt, small and elegant (and very accurate)
Is there Victron guidance on Mega vs Class-T fusing so I can choose the correct Lynx components for my application?
The short circuit value of the battery is the guidance here
It’s not for the the other components
@@johannesboonstra6917 At this connection point, it's protecting the battery and up to 4/0(120) battery cables from a SS. This device can handle max 4/0(120) In ideal conditions the max ampacity of copper is say 445 amps while the US NEC puts it around 260@90c, less if cables are in wet conditions@75c max. So this puts us in fuse size 250-400range. Depending on blow characteristics of the fuse size of 350amps might keep us from exceeding 445 for any extended period. Not counting derating due to high ambient, multiple conductors, or insulated cable placement.
So why care about more expensive harder to get T-fuses, unless there are some standards that require them at these amperage? I like the integrated nature of the fuses, but at 2 connections per device, I'm failing to see an advantage. The M10 connection is good for the surface area.
I've always wondered if I could take a power distribution device, move to left of the shunt, hook up to 4 batteries there with fuse size up to 500amps, and nice lights to tell me when one blows. Then put another on the right side of the shunt for loads. This gives me 4 mega fuses on each side. Not suggesting this is a supported or intended configuration, but it felt useful to me.
This is why I feel I'm missing something here. I'm great with safety, correct sizing/fusing as death by electrical fire is not high on my bucket list. Always seeking to learn.
After posting, went and read the lynx distributor manual. Was pleasantly surprised to see it is supported to use it for mega fused battery connections. I may have missed it but could not find a max cable size in the doc, or if the M8 or M10 versions supported different sized connection cables. Which leaves wondering why I want T fuses? I don't know much about mega/T-fuse blow characteristics or if they are similar to breaker A-F rating curves? I'll keep my batteries close to power distribution, but some may have longer cable runs that need protecting. So I'm scratching various body parts wondering about this new device, and how I would deploy one vs the 4 connection mega fuse device?
@@johannesboonstra691799% of the batteries don't show the possible short curcuit current in the manual. Victron has to also account for that Lynx is not only used with their batteries. In short megafuse should be never used with lithium batteries, as exception you can use them till approx 200AH batteries. I always use NH fuses, which also works as disconnect switch till 48V systems as you can pull it even under full load. Means 2 connections less (=less failure points and less voltage drop) and money saved for disconnect switch.
Always use class T or NH fused with lithium batteries, the very small till 200AH a megafuse can be used but shouldn't. Instead class T use NH fuses, much saver as 50-80kA short curcuit protection and avaliable in all characteristics, not only superfast which is actually too fast as battery protection if you eg use your lithium also as starter due to high surge loads. The battery can do it but the class T not and need to be oversized which means now your continuous overcurrent protection is now too high. NH fuse in GG fast is correct choice here, as it has the correct continuous overcurrent protection as well as the peak on for the surge starters or bowtruster or windlass creates.
I use DC circuit breakers on each string. They work well. Is there a problem using these? What is the advantage of a fuse, over a circuit breaker?
More money for Victron 😊
QQQ. 1:58 if I have 6, 12 V 100 amp batteries and what you’re considering “two strings”you’re saying I need two
class T fuses 😮
Why can I not just put fuses directly on each battery?
You can , but if the battery short circuit is high you need to find the correct fuse
You need 6 fuses, one for each battery. Being 100AH you can use MRBF fuse directly on the terminals BUT only because they are 100AH ones, each battery must also have a disconnect switch so you can isolate the battery. Means 6 times fuses+disconnect switch...better use 2x300AH batteries and you only need 2 fuse+switch+cables+lugs...less failure points, less volatge drop plus spend more on capacity and less on install equipment. Always use the biggest capacity lithium avaliable that fits in your space and if that's not enough fit a 2nd/3rd....one till you reach capacity you need.
Can this new fuse protect against EMP and Solar Flares?
its a fuse with a high short circuit capacity,
i appreciate the increase from M8 to M10, as M10 has significant larger contact surface (+60 to 80% larger surface)
will you offer conversion kits for owners of the "old" Lynx? I mean kits to convert the plastic inlets to house m10 screw heads
Cheers
Michael
but with m 10 most lugs loose metal
I am just looking through the specs on victron batteries and can not find the scc stated for the different models. Is there a list so we can correctly configure a system? as i understand the class-T can handle up to 20k AIC, MRBF fuses can handle up to 6k AIC, but i am unsure what rating the standard mega fuses are, and are the 32v megafuses rated different to the 58v on AIC?
For the NG models the list of minimal and maximal short circuit are listed below, would that help you ?
12,8V-100Ah
1500
3500
12,8V-150Ah
3000
5500
12,8V-200Ah
3000
7500
12,8V-300Ah
6000
11000
25,6V-100Ah
1500
3500
25,6V-200Ah
3000
7500
25,6V-300Ah
6000
11000
51,2V-100Ah
1500
3500
Hi I have three Victron Lithium Battery Smart 12,8 batteries, each wired separately to a Lynx Distributor. Each one has a 300 amp Mega Fuse. I had my installation reviewed by someone who installs allot of Victron systems on boats. He suggested I replace my Lynx Distributor with a Lynx Power in, and install a 400 amp Class-T fuse on each of my three batteries. He the Mega Fuses could arc and melt into a solid connection. Do you think I should do this? Is this good advice with stand alone batteries?
Thanks for this demo. Are these Class-T fuses are compliante with Pylontech and Seplos (DIY) batteries ? Or do we still have to continue to use NH fuses ? Thanks.
The Class-T have an extreme high short-circuit value so will also be fit to be used with Pylon (if these are to already internally fused)
@@johannesboonstra6917 Thanks.
@Victron Energy - it would be nice to have a Lynx X in the Product Range - so you can Switch Inputs Upside Down. Especialy on ESS System's from Top you came down with the connection from the Multiplus - from the Buttom you came from the Battery's 🙂
yes agree, we have some discussions on these solutions already but due to priority elsewhere its not happening soon I am afraid.
It is so easy to implement and it should be done already. To just need a bended piece of copper and a different plastic mold. Please do it
@@donalexeyyeah right 😂
@@johannesboonstra6917 no? What have I missed?
@@donalexey the fact that there are priority elsewhere, therefore its not happening soon I am afraid. its always about making choices what to do first..
Only 2 class-T fuses makes it a lot more expensive and an extra unit provides also an unnecessary extra connection in your busbar system. Is the production of a 4 channel Power-IN in sight?
Depending on your application, you should be ok to connect pairs of batteries using standard diagonal parallel cable connections. Then connect each pair to a class-T fuse. This will let you connect 4 lithium batteries
That’s the way Victron rolls. Just like we all need five fuses in the VictronConnect, but they only give you four.😢😢😢😢😢😢😢
I am afraid not on short term , the size and temperature generation of these are the reason 3-4 units are not possible in this housing
@@johannesboonstra6917 Thank you for the info. That makes sense.
Use NH fuses instead, they have 50 till 80kA AIC, are cheaper and saver. Also no knock offs are avaliable. The heat distrubuted by these fuses also show their high resistance means voltage drop is bigger with class T then with NH. A 3rd issue with them is they are superfast so if you have high peak draws like starting engine from your main house classT must be oversized otherwise they blow due to surge but that means your overcurrent protection is too high. Another reason to use NH as they are avaliable in all characteristics you need. You actually wanna have GG fuse means fast acting as they allow much higher peak currents which your lithium bank can deliver savely.
4th the lynx distributor is rated for 1000A but only carries a 8mm x 30mm busbar in it which is rated to 418A till 478A depending on which busbar calculator you use, so how does victron get to a 1000A rating here....I pulled 550-600A over 20min over it and the case started to deform because getting too hot means the rating is simply not correct as the busbar calculators show. All correctly installed and torqued down, no bad connections or crimps. With NH3 all stays handwarm at that load.
My victron requires a 600A fuse coming from the battery’s,can this working with 2 300A t- class fuses, i ask this because i have 3 battery banks from 48V 608 Ah and will connect them to a busbar but every bank separately have a breaker from 125A for redundancy and maintenance
3x125A (475A) is max system current, system will work using 2x300A of course, but those fuses will never go open as those smaller 3 (125A) will go first. Also, if you're batteries are 608Ah max, I would use 400A main fuse (2x200A will do), still alowing each bank to pull 125A but in total it limit max battery SC current to 400A thus saving battery life span. Always mind fuses thermal properties, how long they could take max current before meltdown... good luck.
What is the maximum short circuit interruption current of a Victron MEGA Fuse? 5000A?
Depends on the model , also 2500 is normal
I’d like to see a Lynx style component with: 1) 1 Class T fuse slot (sized for up to 400A), 2) A 500A rated shunt, 3) A manual battery disconnect switch (rated to at least 400A).
All in one.
Retail price target: $300-400.
Actually, minus $25-50 since the class T fuse won’t be included.
yes there are many options/ideas. The issue we have is that we need to prioritize development power , but this will be on the list.
I have secured my rather small setup (200Ah) with a Victron 100A Mega-Fuse.
Now I saw a video where somebody tested such a Mega-Fuse and found out that they not melt at a bit more current than 100A but melted at around 16 minutes at 250A.
Since than I am unsettled if my system is safe because my cable diameter is not capable of 16 minutes 250A. My van would burn.
My question: Can I be sure that Victron megafuses really break at that current which is printed on?
Can you proof that in a video where you test numerous Mega-Fuses? That would calm me down...
Are Mega-Fuses reliable? Are there other fuses also for smaller systems which a definitely reliable?
Victron is not a company that is known for making crap (but I don't believe they making own fuses), so you're safe as you can be. Nothing is 100% reliable. Any fuse has rating, maximum load at ambient temperature and how long it can take it, close to maximum load and time delay factor (how long it takes to open). More on this you can find in datasheet regarding megafuses.
If it would be my van, I would ether raise system voltage (lets say from 12VDC to 24 or higher) or split power to 4 banks using smaller inverters thus fuses. I'm not fan of crazy large current over low voltage.
Also, mind to always use DC-DC wherever is possible instead going DC to AC than back to DC, like using 110/220VAC laptop charger to power laptop in a DC loom, use 12VDC to 19VDC (if that what laptop is rated for) boost converter, it's much more efficient. Good luck.
There are other fuses that mount on a post post, but I have not seen any videos of anybody testing those😮
Your characteristics of the fuse is wrong, you need a superfast acting one. You have a slow or fast acting model, that's why it's allowing you significantly higher and longer peak currents. Also your cable can carry shorttermed significantly more current that it's rated for. How big/diameter is your cable?
I only use NH fuse with lithium, safest fuses avaliable as 50-80kA short curcuit interrupt current, are avaliable in all characteristics (not only superfast like class T) and have the lowest voltage drop. You also spec them to 100% and not to 125-130A as with the other fuses as they are made to run at max rating for 14/7/365...your megafuse not.
does this mean, that M8 Lynx will not be sold any longer? My hole system with Multiplus 2 5000 uses M8.
M8 will be phased out indeed , but by drilling the m8 to m10 you could theoretically interconnect
Mind if you diy drill M8 to M10, any imperfections in contact surface, like pitting or burr, will induce drastically more junction heat rendering M10 less current capable than M8.
@@johannesboonstra6917 That is a very bad idea! It is not simple to find cables with M8 on one side and M10 on the other side.
What is considered a large battery bank system? I have 3 24V 200Ah lithium batteries wired in parallel via a Victron Power-in powering my Multiplus 24/3000/70 2x120. Would it be considered large?
I have a similar question I have six 100 amp powers at 12 V which I believe is the same as what you have in 24 V.
And I have mine in two groups of three… So I need two, class T fuses?😮😮
I also have 3 25.6v/200Ah Smart Lithium connected to a Lynx with 3 Mega Fuses (24v system). The spec sheet does not show max short-circuit. Should I be looking at Max Continuous Discharge? For these batteries, that is 400A, which appears to be within range for the Mega Fuses. And, since I have 3 batteries, I'd need 2 of the new Class T modules. Believe I'm OK with the current configuration.
M10 vs M8 doesn't do anything in terms of current capacity, except possibly lower it, but I haven't done the math on that. However, the M10 bolts make a more secure connection, which is nice when the project calls for four, five, or more Lynx products in a line. The bigger issue is that the advertised 1000A continuous capacity of the buss bars is not even close to correct. Measure the buss bars inside the Lynx and do the computations OR use any of the copper buss bar calculators on the web and you'll see that 500A continuous current is about the max before heating issues arise. 1000A continuous across the Lynx system can actually melt the plastic surrounding the buss bars. That means in large systems with many large inverters you cannot put your batteries at one end of the buss bars and loads/sources at the other. This also means building very large systems with Victron batteries is difficult since the VE batteries require an external battery monitor (i.e. the Lynx Smart BMS or Lynx Shunt) and that battery monitor is limited by the current carrying capacity of the buss. Doing so with eight Quattro 10kVA inverters and thirteen MPPT RS 450/200 (one of our recent projects) means interleaving the batteries, loads, and sources across the buss bars to keep localized currents within the bounds of the 500A continuous capacity of the Lynx system. This is very doable, but requires using multiple standard Lynx Power Ins with smaller class-T fuses (for each battery string) and MEGA fuses (for sources and loads). This is how integrators have been doing larger systems for years, though it's not supported by Victron. Alternatively, use batteries with communicating BMS's along the DC buss to avoid having an external battery monitor that is a choke point. This is the approach our Victron reps have suggested.
For 90% of Victron installations the Lynx system is just fine and you don't need to worry about batteries on one end of a buss and the sources/loads on the other.. But if you're building larger systems then you need to take into account the limitations of the Lynx system. We still prefer to string together multiple Lynx PowerIn since it gives a neater look than custom buss bars. It just means interleaving all the sources, loads, and batteries evenly along the buss.
Absolutely correct. This is why all gear has ambient temperature ratings, like 20*C or 68*F (NIST standard) current rating means, no matter how hot buss bar gets, ambient temp still has to be maintained to those 20*C rated aka forced cooling should be used. Back in a days we had RMS or continuous ratings which meant 100% duty cycle, which further meant if it's rated 1000Amps it will endure that load throughout entire lifespan of a product in acceptable temperature range, like commercial 0:70*C, industrial 0:125*C or military -55:125*C which is today reserved for very narrow product range...
When is it available in Suid-Afrika
It will indeed
You don't necessarily need the Lynx Class-T. You can also use the normal Lynx together with the adler ef3 fuses.
Depending on the possible short circuit current that’s correct
I use NH fuses
I just had a look on the total internal resistance of a real-world 60kWh battery bank that I recently built (under optimal conditions, battery temperature slightly below 30°C). On a 140A sudden load change, the voltage is reacting with a delta of 0.4V, as seen by the Multiplus, all wiring, breakers, fuses and DC distribution included. Hence the Ri of the whole battery system is only 0.003 Ohms. Assuming 56V, this could result in a short-circuit current of whooping 18666A or almost 19kA!
could be, but thats connected in several strings to the busbar I suppose?
@@JohannesBoonstra-ol2nz Yes, two strings of two battery modules paralleled externally on each Class T fuse (additional breaker within each battery module), with rather short wiring 70sqmm. The planned/calculated/expected Ir was bit higher, though.

@@holger2806 then you should be well below 20kA per fuse so thats fine
I use knife fuses, 120kA cutting capacity...far from those t-fuses and they cost like 5€ a piece
can be used as well, its just not as nice to integrate in a lynx system But as always, there are more solutions then one.
🩵👊😎
Compliments to mr. Boonstra as it's takes great skill to be able to talk 3,5 minutes about something that's so obvious and already on the market made by same company... and yes, speaking about connections, bigger is not necessarily better, M10 bolts could handle less current than M8 if metallurgic is wrong, for example golden plated M8 has less contact resistance than M10, or even M16 in stainless steel, means there more room for developing "new" models...also, loom SC current should be less than battery internal SC current as no engineer would suggest to drive batteries to their 100% current capacity. Mind that I know Victron is among greatest companies on the market.
😂 thanks
Mr Boonstra talked a lot longer than that ;-). All day in fact as you will soon see on other products!
Those contemplating using this T class Lynx for marine installations should be aware that the ABYC regulation for the maximum distance between the Lithium battery positive terminal and the fuse is no longer than 7 inches in order to protect the cable! It seems more feasible and safer to just use 2 Class T fuse blocks.