72v + users, do you use a pre-charge resistor?

[Alan B]

The high current is not good for the capacitors either.

 

[GCinDC]

from: http://www.rcgroups.com/forums/attachment.php?attachmentid=1726156

 

[GCinDC]

these are what i use @20s, fyi.

 

[icecube57]

Im changing resistors.. they still gonna be 5w but im ditching the ceramic ones and getting the ones you have and making it similar to yours but instead of andersons I will use bullets...

 

[Tommy L]

I use a 100watt light bulb

I plug my Negative leads together, then I put this light bulb in series with the Red + battery lead and Red + Main controller lead wire.
I wait 5 to 10 seconds and then quickly put my two Red+ together, removing the light bulb from the circuit.
Oh, the things we learn here on the ES Forum! :lol: I'm running a 128v nom battery pack. This lights up, briefly!

Tommy L sends.... \\m//

 

[sn0wchyld]

I use a 100watt light bulb

I plug my Negative leads together, then I put this light bulb in series with the Red + battery lead and Red + Main controller lead wire.
I wait 5 to 10 seconds and then quickly put my two Red+ together, removing the light bulb from the circuit.
Oh, the things we learn here on the ES Forum! :lol: I'm running a 128v nom battery pack. This lights up, briefly!

Tommy L sends.... \\m//

not a bad idea. You could use a smaller, say 12 volt globe in series with another hunded-or-so resistor, for a easy way to know when things are charged, and that they're working each time you plug in!

 

[Tommy L]

not a bad idea. You could use a smaller, say 12 volt globe in series with another hunded-or-so resistor, for a easy way to know when things are charged, and that they're working each time you plug in!

Great Idea!

Tommy L sends.... \\m//

 

[nechaus]

from: http://www.rcgroups.com/forums/attachment.php?attachmentid=1726156

i do it this way, or do it with the contactor

 

[John Bozi]

Would it work temporarily to just plug in a 6s battery first, unplug and then plug in the rest of the batteries. My controller seems to spark very little the first few times I used them, got worse though...

I got to get to the shops to buy all the resistors etc.

 

[TMaster]

All I use is a crystalyte 40A key switch with 12AWG modified wires. I've been pumping peaks of over 100A through it for the last 3 years. All I have between the battery and the controller is this switch. 0 problems. no sparks, nothing.