36 and 48 volt motor controllers

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james joule
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36 and 48 volt motor controllers

Hi, can anyone tell me if it's better to use a 48 volt controller on my 36 v 30 amp bicycle, the original one has gone up in smoke, it looks like the mosfets were not touching the heat sink properly, great site many thanks, James.

win32forth
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Re: 36 and 48 volt motor controllers

Have you considered just replacing the FETs?

Tom

e-doggies
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Re: 36 and 48 volt motor controllers

James,

A 48V controller probably won't work. They usually have a Low Voltage Cutoff (LVC) of about 41+/- volts. Your 36V pack won't be high enough.

james joule
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Re: 36 and 48 volt motor controllers

Hi, Thanks for the replies,I'm going to have a go at replacing the mosfets, cheers james

antiscab
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Re: 36 and 48 volt motor controllers

When mosfets blow, they have a tendancy to destroy the gate driver aswell (because they fail short circuit).
If you are replacing the mosfets, id also suggest replacing the gate drivers.

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

james joule
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Re: 36 and 48 volt motor controllers

Cheers matt I'm not sure what a gate driver is though I'll try to find out, do you know what causes a brushless controller to spark and seem like a dead short when I try to connect just the battery and nothing else, I only have to touch the battery wires + and - to the controller + and - and I get an almighty crack and a big spark and I dont have anything else connected, cheers james

marylandbob
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Re: 36 and 48 volt motor controllers

You could be seeing a spark from a current surge charging capacitors on the controller board. Try connecting the battery with a 10 ohm, 10 watt wirewound resistor in series, to limit the surge. If the resistor gets very HOT, you have a defective controller part.--Bob

Robert M. Curry

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