Anti spark XT90 connectors

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benj   100 W

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Anti spark XT90 connectors

Post by benj » Sep 11 2014 3:17am

I hadn't seen these before, but they look great for a budget setup and if space is at a premium. They fit a standard XT90 but handle all the anti-spark stuff for you, so just solder them in and happy days. Cheap too!

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SunCoaster   100 W

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HobbyKing Anti-Spark Connector - XT90-S

Post by SunCoaster » Sep 11 2014 4:42pm


itchynackers   100 kW

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Re: Anti spark XT90 connectors

Post by itchynackers » Sep 11 2014 5:15pm

It doesn't really give any information on what wattage/resistance these are. I currently have a 1000ohm 10 watt resistor for my 100V setup. Not sure if this would work or not.
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Re: Anti spark XT90 connectors

Post by teslanv » Sep 11 2014 11:05pm

So if I understand correctly, these connectors have "pre-charge" resistors built into the housings?
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Re: Anti spark XT90 connectors

Post by Drevious » Sep 14 2014 3:42am


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Re: Anti spark XT90 connectors

Post by whereswally606 » Sep 23 2014 4:31pm

Just received my connectors today. Installed 3 minutes ago and I can confirm no spark with a 54.6v pack, a very happy uk customer.
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Re: Anti spark XT90 connectors

Post by itchynackers » Sep 23 2014 8:16pm

Thanks for the update. I have mine on order. I have a 25s lipo pack to try. Hopefully no spark, but I doubt it.
9c 9x7f w/ 12awg phases
9c 8x8r w/ 10awg phases, temp sensor, vented
9c 6x10r w/ 10awg phases, temp sensor, liquid cooled, 3rd Place Pikes Peak 2012!

"Don't argue with the galactically stupid...they drag you down to their level and beat you with experience"

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Re: Anti spark XT90 connectors

Post by Silenthunter » Sep 23 2014 8:48pm

What is the amps rating for this connectors?

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Re: Anti spark XT90 connectors

Post by amberwolf » Sep 25 2014 7:00pm

I'd guess it's 90A, minimum, possibly a bit more?

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Re: Anti spark XT90 connectors

Post by Silenthunter » Sep 25 2014 10:13pm

I would like to buy some for my mountain board with 8S 33.6V pack....I pull average 40 amps and max about 120-150 amps. I guess it should do it...

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Russell   10 MW

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Re: Anti spark XT90 connectors

Post by Russell » Sep 25 2014 11:42pm

itchynackers wrote:It doesn't really give any information on what wattage/resistance these are. I currently have a 1000ohm 10 watt resistor for my 100V setup. Not sure if this would work or not.
Why so big?



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Re: Anti spark XT90 connectors

Post by itchynackers » Sep 26 2014 6:04am

Because it doesn't spark. What would you suggest?
9c 9x7f w/ 12awg phases
9c 8x8r w/ 10awg phases, temp sensor, vented
9c 6x10r w/ 10awg phases, temp sensor, liquid cooled, 3rd Place Pikes Peak 2012!

"Don't argue with the galactically stupid...they drag you down to their level and beat you with experience"

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Russell   10 MW

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Re: Anti spark XT90 connectors

Post by Russell » Sep 26 2014 9:42am

Of course it depends on the size caps in your controller but 100 ohms would be fine for 100V. I'm using 50 ohm for a 12S pack w/main caps of 470-1000uF. Peak current of 1A for a tiny fraction of a second.

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Re: Anti spark XT90 connectors

Post by itchynackers » Sep 26 2014 4:25pm

Just got my xt90's in the mail. Looks like there is a very small "5.6ohm" printed on the connector. With that, what maximum voltage should these be good for?
9c 9x7f w/ 12awg phases
9c 8x8r w/ 10awg phases, temp sensor, vented
9c 6x10r w/ 10awg phases, temp sensor, liquid cooled, 3rd Place Pikes Peak 2012!

"Don't argue with the galactically stupid...they drag you down to their level and beat you with experience"

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Re: Anti spark XT90 connectors

Post by teslanv » Sep 26 2014 4:29pm

I thought the point of a "pre-charge" was to slow the current flow during the initial connection. If the 5.6ohm resistor is in the primary (And ONLY) path of the current flow, won't it inhibit the flow of current and heat up when discharging the battery at high amps? And wouldn't you need a clear path with minimal resistance from the battery to the controller/motor?
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Re: Anti spark XT90 connectors

Post by itchynackers » Sep 26 2014 4:35pm

I'm fairly sure the pre-charge only "charges" when you begin to make the connection. As you slide the connector on all the way, the pre-charge disengages, while the main connects completely.
9c 9x7f w/ 12awg phases
9c 8x8r w/ 10awg phases, temp sensor, vented
9c 6x10r w/ 10awg phases, temp sensor, liquid cooled, 3rd Place Pikes Peak 2012!

"Don't argue with the galactically stupid...they drag you down to their level and beat you with experience"

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Re: Anti spark XT90 connectors

Post by jackjetful » May 18 2015 2:20am

Also bought this connectors for my current build; have a 20S Battery ant Kelly Controller.

the required precharge resistor is 1K!

I opened up the XT90 and here is what it looks inside:
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Re: Anti spark XT90 connectors

Post by jackjetful » May 18 2015 2:25am

5.6OHM seemed to be to less to charge the capacitors of the Kelly.

I think they would charge up to fast; this could damage them.

I also don't know how many watts the 5.6OHM Resistor has.
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Re: Anti spark XT90 connectors

Post by nutnspecial » May 18 2015 3:50am

Hey brother! My 2cents= I think I heard the resistor is just really to protect the connectors, and caps are not damaged by 'surge' that don't exceed rated capacity.

Also, from what my infineon does without any anti-draindown mods, you have to leave the battery disconnected for days to fully drain down the 18fet 4110, and even then it's no real big deal to reconnect the 82v, but it does SNAP a little lol. I leave it connected except when charging anyway.

Ps, I didn't know you were doing 20s!!!!! I wish we were able to get together and ride!

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Re: Anti spark XT90 connectors

Post by Nobuo » May 18 2015 5:59am

jackjetful wrote:5.6OHM seemed to be to less to charge the capacitors of the Kelly.

I think they would charge up to fast; this could damage them.

I also don't know how many watts the 5.6OHM Resistor has.
Do you think is as small that is useless?

i found them at a good price.

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Re: Anti spark XT90 connectors

Post by riba2233 » May 18 2015 7:01am

You didn't have to bother, 5.6 ohm would work fine. With 1k you need to hold the connector partially plugged for few seconds, which might be easy to forget every time. And with 5.6 ohm you don't have to think about it, just plug it in, it precharges pretty fast.

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Re: Anti spark XT90 connectors

Post by KalSteve » May 18 2015 9:34am

I've got them, use them on 48v and 72v setups. Work great, no fuss no spark. Easiest precharge resistor setup I have seen.

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Re: Anti spark XT90 connectors

Post by Hummina Shadeeba » May 18 2015 10:41am

These say 150

I have too many if ur interested. Nice because they allow you to separate the wires.

http://rcsearch.info/hobbyking/i42825/

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Re: Anti spark XT90 connectors

Post by Vanarian » May 18 2015 11:42am

Hummina Shadeeba wrote:These say 150

I have too many if ur interested. Nice because they allow you to separate the wires.

http://rcsearch.info/hobbyking/i42825/
How many do you have? I'm interested ;)
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Re: Anti spark XT90 connectors

Post by Hummina Shadeeba » May 18 2015 1:09pm

I went crazy buying plugs of different types. these I have at least 6 extra. you need two. connect the black then the red.

write me pm and we can figure out what you can send me in exchange. Maybe you can let me live on your nice outdoor patio I saw in your video.

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