ANL is only rated up to 32V though.
Do we still need T-Class Fuses?
- Thread starter priorityelec
- Start date
ANL is only rated up to 32V though.
Not if you get the right one.
ANN-100
ANN 100 Amp, 125V, Specialty Fuse, Bussmann ANN-100, ANN 100A | aka: Cooper Bussmann ANN-100, Eaton ANN-100, UPC: 051712706445
www.allfuses.com
https://www.allfuses.com/all-products/fuses/anl/anl-100 for ANL (Higher AIC, slower blow time)
Tulex
Solar Wizard
I thought the interrupt rating was too low for ANL fuses?
Yeah, I made a error on the voltage - the interrupt rating on ANL is only 2700A though.
Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,916
But did you blow it with a worst-case short?
Overload doesn't count. Short through longer higher resistance wire doesn't count.
To test this correctly, you want short fat wires and a fat switch or contactor to create a bonded fault.
And you want to test with margin above voltage and current you plan to "rate" it for.
It's not that necessary if you have a single server rack battery or two power pros. Anything under 30kWh. But once you start having multiple towers or 100+kWh, it's smart to use t class fuse.
Large low resistance batteries in parallel are dangerous. When a supply conductor or anything gets shorted, you can create a large DC arc that's hard to extinguish.
Circuit breakers and fuses can also fail. Or have an AIC rating unable to stop an arc.
Keep in mind that if you only have a few batteries, the resistance of the bms and small wires connecting the batteries is enough to reduce the current for the bms or breaker to trip. It's hard to reach AIC for most dc breakers when used properly.
But if you have five stacks of server rack batteries, the amount of current that can create is scary. The arc would be very difficult to destroy. So it is best to have a t class fuse for each stack. Keep in mind it's not the batteries in the stack that pose a threat, it's all the others connected in parallel feeding into the faulty string or pack.
T class fuse is best we have for high AIC rating OCPD. They can disconnect 20-30k Amps. Sometimes higher depending on manufacturer and model. Most small fuses and breakers AIC are 500-6000A at a specified voltage. Voltage actually matters here too, so make sure OCPD is rated for voltage range you plan to use it in.
Large low resistance batteries in parallel are dangerous. When a supply conductor or anything gets shorted, you can create a large DC arc that's hard to extinguish.
Circuit breakers and fuses can also fail. Or have an AIC rating unable to stop an arc.
Keep in mind that if you only have a few batteries, the resistance of the bms and small wires connecting the batteries is enough to reduce the current for the bms or breaker to trip. It's hard to reach AIC for most dc breakers when used properly.
But if you have five stacks of server rack batteries, the amount of current that can create is scary. The arc would be very difficult to destroy. So it is best to have a t class fuse for each stack. Keep in mind it's not the batteries in the stack that pose a threat, it's all the others connected in parallel feeding into the faulty string or pack.
T class fuse is best we have for high AIC rating OCPD. They can disconnect 20-30k Amps. Sometimes higher depending on manufacturer and model. Most small fuses and breakers AIC are 500-6000A at a specified voltage. Voltage actually matters here too, so make sure OCPD is rated for voltage range you plan to use it in.
Picture shown is after the accident. Battery pack is 16S 105AH LiFePo4. ANL is 150A rated. AWG #6 cables used. Ends of red and black 3 ft cables (right side of picture) accidentally touched together.
yabert
Solar Enthusiast
Affordable alternative to class T
diysolarforum.com
Eaton AMX and AMH Fuses alternative to Class T
I think I found a really interesting 10-15$ fuse alternative to Class T fuses. Eaton Bussmann AMH specs: -current ratings 350A, 400A or 500A -ultra-high interrupting ratings, up to 20,000 A. -voltage ratings, up to 125 Vdc Eaton Bussmann AMX specs: -current ratings 80A to 350A -ultra-high...
diysolarforum.com
Yeah, I HATE any crossover of primary cables on any of my builds.
I am kinda anal about it.
I ordered Victron switches, DC breakers, and 250a T-class fuses for every battery for battery to bus bar.
As well as 300a T class from inverter to bus bar.
No clue if that’s “excess” or not, but figured the peace of mind was cheaper
As well as 300a T class from inverter to bus bar.
No clue if that’s “excess” or not, but figured the peace of mind was cheaper
DIYrich
Solar Wizard
Depends upon how many batteries you have. If you have 4 batteries, that is the potential for 1000 amps (4x250) before the Battery Class T blows. So protecting the Inverter line with a Class T can protect against a short after the busbar.
If you just have 2 batteries, then the inverter class T may not be worth it.
Zwy
Emperor Of Solar
For $59.99, I received 175A Class T fuse and the holder and I had free shipping.Affordable alternative to class T
Eaton AMX and AMH Fuses alternative to Class T
I think I found a really interesting 10-15$ fuse alternative to Class T fuses. Eaton Bussmann AMH specs: -current ratings 350A, 400A or 500A -ultra-high interrupting ratings, up to 20,000 A. -voltage ratings, up to 125 Vdc Eaton Bussmann AMX specs: -current ratings 80A to 350A -ultra-high...
The fuse holder is very stout and includes a cover. It is UL rated.
While your fuse might be $15, where is the holder and how much is shipping? UL rating for the holder?
I might be tight with a buck but I'm not cheap.
Zwy
Emperor Of Solar
I'm not a fan of stacking on terminals either. I'm anal about busbars.
When I did my junction box for charge controllers, I made an insulated standoff under one busbar so the cables would not lay over the other busbar or cables. Shown here in this part of a video of mine.
Andrewr05
[Replicant 42069]
It's not my system, but I don't like how close those uncovered/unshielded busbar/terminals are.
That seems like an(other) accident waiting to happen.
Attachments
Agreed, but I was trying to fit everything in a space not intended for the EVE F105 cell/battery pack. By the way, not shown, the cabinet has a non-metal cover on top.
If you cannot reroute the cable, at least rotate the lug over so cable isn’t resting on the negative stud.
12VoltInstalls
life passes by too quickly to not live in freedom
Right. But a breaker on the battery? Should, right?
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
- Messages
- 18,925
Yup
You can't really get any closer to the positive terminal, than the other side of it. lol
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