sunshine_eggo
Victron's little biatch
My 12.8V 100ah GoKwh battery measures 4mΩ.
My 8S 280Ah EVE cells measure about 2mΩ.
My 8S 280Ah EVE cells measure about 2mΩ.
You are correct. As is AntronX. A higher-capacity cell will have a lower internal DC resistance.But a 10 amp cell won't have the same amount of amps flowing compared to a 1000 amp under a fault condition (ie direct short)- I'm trying to calculate fuse/breaker break load capacity (the load at which the fuse/breaker can sustain before being destroyed - not to be confused with trip current).
Well, everything else being equal (not that it is), but 1/4 the resistance. But see @AntronX aboveOK, it's sinking in now. So a 56v LIFEPO4 pack 16s 280amp (with a resistance of .21 mΩ would be 56/0.0021 - approx 26kA. What about a 4p16s pack (1120amp x 56 volt)?
Thanks
No, i was thinking of using that fuse for the group of batteries. I will be having two more groups (each with a NH00 125A fuse), so in totalt nine 15kWh batteries.
The caracteristics is shown here:
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In what way?The correct type of NH fuse ist type gR.
gR is designed for DCIn what way?
I meant why specific, what differs them apart?gR is designed for DC
gG is designed for AC
So how do you mean the physical structure of a NH00 fuse differs if its gG or gR?At the time a fuse interrupts a current, an arc forms.
Electrical arcs require a certain minimum current to continue. Everything else equal, with AC the arc stops at the AC current zero crossing and a new one (may) start once the minimum voltage/current condition is reached again. With DC the arc is continuous. As a result, DC is much harder to switch, disconnect or fuse. Thus you require specialised fuses, switches, connectors, breakers, etc.
As an example just look into the datasheets of fuses or relais, and compare AC and DC ratings.
The gR is designed and tested for the special needs of DC.So how do you mean the physical structure of a NH00 fuse differs if its gG or gR?
I would like my fuse to handle some overload, like peaks of normal current, but cut the arc fast on a short-circuit issue.
Found this: https://hal.science/hal-04192068/documentThe gR is designed and tested for the special needs of DC.
The gG is designed and tested for AC.
Typically, if you compare the same fuse, the gR version has lower ratings for open circuit voltage and short circuit current. How much lower is model specific. E.g. a random fuse from Siemens 3NA3836 160A, is good for AC 500V/120kA, But for DC it is only good for 250V/25kA.
So how do you mean the physical structure of a NH00 fuse differs if its gG or gR?
I would like my fuse to handle some overload, like peaks of normal current, but cut the arc fast on a short-circuit issue.
gR fuses are called "semiconductor" fuses unofficially by older utility grid people. Back then, DC was only used with semiconductors (inverters, VFDs).Found this: https://hal.science/hal-04192068/document
"aR and gR fuses, often referred as “high-speed”,“ultra-fast” or “semiconductor” fuses, are dedicated to power electronics converter and DC applications with a minimized thermal stress, peak current and arc voltage [10]-[12]. On the other hand, existing AC distribution grids use gG fuses whose requirements are described in [13]. Both technologies may be suitable for LVDC distribution grid."