Hello Plamen, Dacian and others,
thank you a lot for testing results of breakers.
In the end I have discovered "better local Langirs".
Local company OEZ is offering here in Czech republic breakers at lower price level than those Langirs.
For example here:
According to datasheet 63 rated breaker should have 1.5mOhm and 125 rated breaker even 0.7mOhm!!!
That is imho way better than chinese Tomsns. My solution is in the van so every watt maters to me as I am not able to add more PVs.
Even though I am not sure, how these OEZ breakers are internationally available, I will share some real life measurements.
The point can be that searching for local vendors of this kind of stuff maybe also the way.
I will also buy some T-class equivalent fuses from OEZ for very pleasant price.
Can I discuss here breakers vs fuses subject?
As I understand it now, breakers are better than fuses in terms of:
- speed in breaking short circuit thanks to the coil, even 5x continuous current rating which is way better than T class fuses,
- switching ability.
Disadvantages of breakers in comparison with fuses are:
- only up to 125A,
- slightly higher internal resistance than fuses, seems it highly depends on quality of the breaker,
- smaller breaking capacity - typically 10kA in comparison with 50kA+ of T class fuses, but it is still acceptable for our LiFePo4 batteries,
- i would like to write price but some fast acting fuses are pretty damn expensive.
Would you guys agree with simplification mentioned above?
Considering breaking capacity 10kA of breakers..
Would anyone know what the approximate short-circuit current of LiFePo4 is? I was not able to find it online and I am not able to test it myself.
For example what could be short circuit current of 100A LiFePo4 cell?
Can I put 10kA breaker next to my 600A LiFePo4 pack?
Dne neděle 16. května 2021 v 20:54:42 UTC+2 uživatel Plamen napsal: