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04-28-2010 06:21 AM  8 years agoPost 1
michael88997

rrElite Veteran

Lewisville,Tx

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ok im fixing to build a 8s 500 and would like to have an anti spark on there to protect the connectors... i seem to lost the page and cant find it but how do i know what size resistor to use? im going to have 8s into a phoenix ice 50 on it

thanks

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04-28-2010 06:27 PM  8 years agoPost 2
Coolrunnin

rrVeteran

Manchester U.K.

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Kontronik recommend a 5 to 6 ohm 1/4 watt resistor, not sure about Castle's recommendations though.

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04-29-2010 01:13 AM  8 years agoPost 3
Andy Younker

rrNovice

Chino Valley, Az.

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Castle says to use a 1 ohm 1 watt resistor, I am using it and it works great. I put it on a six cell and twelve cell setup with great results.

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04-29-2010 02:21 AM  8 years agoPost 4
Justin Stuart (RIP)

rrMaster

Plano, Texas

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You can buy a whole assortment of different size resistors for only a few dollars. Try them all, and see which one decreases the spark the most and doesn't screw up the cell count on the ESC. Then let us know what you decide on. If you choose too small a resistor, it will simply burn up, while if you choose too big of a resistor, it will take so long to charge the capacitors that the ESC will think your running fewer cells than you really are.

The fact is, it is a combination of the battery voltage and the size of the capacitors along with the ESC's initialization time which decide what size resistor you need to use. It would be best to start with the smallest resistor you can find, and then slowly work your way up.

If you're good with math, you can investigate the RC time constant which will allow you to calculate the exact size resistor you need:

http://en.wikipedia.org/wiki/RC_time_constant

Avant RC
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04-29-2010 02:28 AM  8 years agoPost 5
michael88997

rrElite Veteran

Lewisville,Tx

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ya im going to talk to castle and see what they recommend on the 8s

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