How much extra Volts can a controller take?

[gullarm]

The reason I would like to know is that I have a 36v 350W controller driving a hall effect front wheel with 2 x 8000ah 18v Lipos in series.

If I add another 18volt lipo this will give me 54 volts - surely too much?

So if I acquire a 48volt controller and another 18v lipo and then over volt to 54 would this be ok?

I just need a bit more speed I'm topping out at 15mph on the canal tow path, I could just do with nudging 20mph.

I have soldered the shunt a bit to give me a some more oomph. The speed limit wires that come out of the controller are not connected, so that cant be affecting the speed.

http://www.ebay.co.uk/itm/36V-250W-6Mosfets-E-Bike-Motor-Controller-with-LED-meter-/131305676205?pt=UK_Bikes_GL&hash=item1e926d9dad&nma=true&si=uZNjLKFhuGdN9a9b2ziWVeFUtAA%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

 

[patpatbut]

Probably not ok as most 36v controllers are using 50v capacitors.

If you use 48v controller would be fine as it uses 60v cap

 

[Kinninvie]

3 x 18.5 volt Lipos when fully charged will be at 63 volts so a 60 volt cap will blow.!