Electric mountain board anti-spark plug/co burnt - advice ne

Lightweight / Folding / Portable EVs - seats optional

Electric mountain board anti-spark plug/co burnt - advice ne

Postby nunchaku101 » Sun Jun 18, 2017 4:24 am

Hello

So I have been using my electric mountainboard for a couple of months, here is a video: https://www.youtube.com/watch?v=Z4Bapyc4Bsw&t=40s

My setup is as follows.

ESCs: https://hobbyking.com/en_us/turnigy-tra ... r-esc.html
Bullet connectors/Anti spark plugs (Red attaching cable connectors)

https://hobbyking.com/en_us/7mm-as150-a ... pairs.html

Bullet connectors to connect motors to ESCs: https://hobbyking.com/en_us/8mm-gold-co ... -pack.html

UBEC: https://hobbyking.com/en_us/turnigy-5a- ... -lipo.html

I had been running at 14V / 4s as initially I had bought parallel connectors rather than series connectors due to not paying attention to what I was buying. My board had been going well, I had been using the board for a couple of months and as i had a couple of spare 7mm bullet connectors I decided to solder them onto a series connector I had available to get the board working at its full power 30V/8S.

The moment the two halves of the red wire connected, the 7mm anti spark plug (which was on the side of the ESCs) made a somewhat large pop/crack and the resistor began smoking, I have included a close up picture of the burnt spark plug to show the extent of the smoking, I had it wrapped in some PVC oversized shrink tube to act as a water shield.

I spoke to Hobbyking and they suggested trying a single 8sa battery rather than use four 2S2C 7V batteries as according to them it could have bee a ripple effect from having many batteries with many connections but I am not sure.

I am by no means an expert with electronics but I did read that if a resistor is used for a while at a certain voltage that running it at a higher voltage can break it as the resistor will have adapted to the lower voltage, is this likely to be the case?

I have re-connected the board at 14V and the board works, the motors run forward and backwards but due to not having anti-spark connectors I did not want to frazzle the parts as small sparks were occurring at 14V, at least everything is working though.

Right now I am wary of getting it going in case there is something that I have forgotten but I am wanting to buy the parts I need get it going again.

I tried to add photos but it did not work, I can make a small YT video to show how it looks at the moment if needed.

Any help would be appreciated as I was hoping to get my board at full power to enjoy it during summer, thanks for reading.
nunchaku101
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