Over volting a controller

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steelefist   1 W

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Over volting a controller

Post by steelefist » Oct 19 2010 7:38am

What would probably happen if I ran a 24V 110A golf cart controller on 45V?

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MrKang   100 W

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Re: Over volting a controller

Post by MrKang » Oct 19 2010 7:47am

only way to know is to look inside the controller and look what's inside.....
I think that allcaps inside are 63V or 48V minimal...especially a 110Amp controller.
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
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amberwolf   100 GW

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Re: Over volting a controller

Post by amberwolf » Oct 20 2010 2:00am

Caps probalby are, but the FETs and other parts likely are not. better open it up to check all the part specs first, and see how the low-voltage supplies for the logic and control circuts are made, so you can put a front end on them to translate from the higher voltage if needed.

steelefist   1 W

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Re: Over volting a controller

Post by steelefist » Oct 25 2010 12:58pm

I checked the specs of the controller and it says they have a max cut off voltage at 36V. Suppose running it on 33.3 (Three 6S LiPo packs in series) shouldn't hurt it. Does anybody know if you can keep a LiPo battery plugged into the ESC (switched off but still wired in) whilst charging it? I know that with LiPo's you have to be extremely careful when charging them.

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amberwolf   100 GW

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Re: Over volting a controller

Post by amberwolf » Oct 26 2010 9:47pm

Depends on what the charging voltage is. Often that's significantly higher than the nominal voltage of the pack--you might want to measure it during charging to be sure.

dnmun   100 GW

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Re: Over volting a controller

Post by dnmun » Oct 26 2010 11:02pm

if that's a brushed controller, then it may get too hot for the brushes if you push the voltage way up. what motor will you use?

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MrKang   100 W

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Re: Over volting a controller

Post by MrKang » Oct 27 2010 1:16am

steelefist wrote:I checked the specs of the controller and it says they have a max cut off voltage at 36V. Suppose running it on 33.3 (Three 6S LiPo packs in series) shouldn't hurt it. Does anybody know if you can keep a LiPo battery plugged into the ESC (switched off but still wired in) whilst charging it? I know that with LiPo's you have to be extremely careful when charging them.
in series ??? 6S ?? that gives you 75.6Volts hot of the charger !!
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
Project link [/color]: http://endless-sphere.com/forums/viewto ... 10&t=13442

steelefist   1 W

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Re: Over volting a controller

Post by steelefist » Oct 27 2010 3:14pm

Oh ye I mean 3 x 3S. Im using a different controller now.... a YK-43. This one is good from 24V - 60V so I can still run the motor on the higher voltage and get more revs per minute.

I'm building an electric quad bike. It's almost finished. I'm using a mini ATV frame with bigger 18 inch tyres and an ex-golf cart motor. The motor is a 24V 750W transaxle motor, with a 25:1 gear reduction and a built in differential!! Brand new they are about £350, but I got mine off ebay (with a very small oil leak - that i fixed in 5 mins!) for £60. I've fitted it to the frame and now waiting for the controller and 2 more lipo packs to arrive. The system will run on 44.4V 10Ah. That's four 22.2V 5000mah packs that can put out 80 amps each (so 160A with the parrallel set up). Controller is good for 100A (for 30 seconds I've been told) and the motor good for 110A - so should be able to handle it quite easily.

Should be completely finished the weekend after next. Just a few concerns left.
Wondering if the controller is gonna receive back EMF from the motor and feed this back into the LiPos. And how they are gonna handle it if this happens. First time I've used LiPo's! I've ordered my charging fireproof bags.

steelefist   1 W

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Re: Over volting a controller

Post by steelefist » Mar 16 2011 3:52pm

Well here is a little acceleration test....

http://www.youtube.com/watch?v=OcFmIfMwukE

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vanilla ice   100 MW

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Re: Over volting a controller

Post by vanilla ice » Mar 16 2011 4:15pm

Cool.

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