Re: (ET) Ok, 400a fuse it is...

[David Tiefenbrunn <davidtief comcast net>]

I am not sure .   I did once measure the locked rotor current that I 
could get with the drive motor on my E12 held from moving.  It has a big 
PM motor for the drive, not one with a field winding.   I prevented the 
motor from turning by putting the frame against an immovable object.  
Used the power pulse to get full power.  I used a scope with a precision 
0.001ohm  resistor [very high power, non inductive] to make the 
measurement.  The locked rotor current peaked at about 300Amps.
It had a decent set of flooded cell golf cart batteries at the time.

Dave


On 6/4/2017 10:47 PM, Christopher Zach wrote:
> Didn't hear back on thoughts, and given that my tractor now has an AIR 
> of over 4,000 amps with the 4 strings of BB600's I figured it was time 
> to buy a real fuse.
>
> So I just ordered a 400a Class T fuse holder with a 400a JLLN fuse in 
> it. The rating on the fuse is 20,000 amps at 125 volts DC, which is 
> well within the range of an Elec-trak. I thought about going with a 
> much cheaper ANL type fuse, but those have an AIR of only 2,700 amps 
> max which as I saw years ago can lead to a very large and nasty plasma 
> arc that will not. go. out.
>
> Anyone know what the AIR is for the stock fusable link?
>
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