This is a thread about EF3’s in Lynx’s.
It’d be pretty economically compelling if they worked.
Just thinking if you could have two batteries EF3 fused into a Lynx power in. Then have the last two studs as MEGA outs, one strait to the inverter and one for DC distribution.
That was my initial thought. Having a potential - and very unlikely - short in mind (wrench bridging the busbar …), such a AF3 could bring more safety regarding arcs and fire without the effort and invest of a new additional Class-T Lynx module.
I also agree with @NFBR , Class-T might a little bit over the top for only two US5000 PylonTechs.
It’s more the inner feeling, having done as much as possible in an affordable way on the safety site for my LI battery connection.
Sorry to be blunt, but your post is dangerous misinformation.
People have measured the short-circuit current of 16S 280 Ah packs at 5500 A, and that is with cabling and a fuse. That is way beyond what any MegaFuse is rated for, it explodes and shoots molten metal all over the place. https://youtu.be/KgK6XCGayz0?t=2000
Ohm’s law: I measured my whole 16S block at 4,5mΩ, which at 50V gives 11 kA of theoretical short circuit current.
So why are the cell mfr’s quoting such a different internal resistance?
For the EVE LF280K for example, the datasheet gives a resistance of < 0.25mΩ, and all my cells measured below 0.2mΩ; multiply by 16 and add a bit for busbars and the 4.5mΩ for the whole pack looks reasonable.
The new Lynx Class-T Power-In arrived and it is now installed in my small DESS System with two PylonTech US5000:
So the bus bar section just attaches to the next module no worries? In my case it’d be a lynx distributor. I guess going from M10 holes to M8 isn’t a problem.
Only real issues are connecting cables to it which need an M10.
Good news I guess
Correct. You just need M10 connectors.
Awesome, thanks for letting me know.
So you would say MRBF is Ok on a lifepo4 24v battery?
I have been wanting to use T class, but the smallest I can find is like 80 amps. We don’t need that much for what we are doing.
MRBF has much smaller amp fuse sizes.
Could I put lets say a 60 amp MRBF and a 80 amp T class on the same wire that only supports 60 amp? The T class would just be a backup incase direct short?
Any smaller than 80amp T class and they look like little bullet fuses, and I have no idea how to get the in line on my cable.
https://www.eaton.com/us/en-us/skuPage.50LET.html
Would this be an alternative for T class? It says aR class?
Interrupt rating 200 kA RMS Sym, 50 kA DC at 150 Vdc
Those are superior to Class T, and more readily available in some markets.
Would it be acceptable to put a MRBF 50 amp at the battery terminal along with a 50 amp aR class fuse such as this one? On the same wire leading to my stuff.
https://www.eaton.com/us/en-us/skuPage.50LET.html
This would be on a 24V lifepo4 battery. The wire is 60amp rated.
Sure, you can do that.
You can think of the aR as the catastrophic failure prevention device, and the MRBF as the normal fuse. Honestly, 32V-rated MRBFs with 24V batteries are pretty decent. But if you want the added protection to sleep better at nights, that will work.
The downside of doing that is increased resistance from having two fuses (some power will be lost to heat), and of course the added cost.
