Advice Required

migrantwing

Veteran
A neighbours friend turned up today and he called me over. His friend has a Halfords Carrera E Bike. He had a puncture and needed an inner tube etc, so I helped. He asked me if I knew anything about E bikes, I said 'no'. He wants to change the bike from a 300 watt to a 500 watt. I understand that this would entail changing the back wheel and possibly the battery. What do I need to know to be able to do this for him? I don't mind doing it as it's a bit of a project and I enjoy bike maintenance, but if I will be way out of my depth, I'll pass.

TIA
 

CXRAndy

Guru
Location
Lincs
A bigger motor will require the controller capable of delivering more Amps to get more power or higher voltage. A bigger battery in Amperage will give longer range.

It depends whether his controller and motor will tolerate higher voltage or more current or both. See if any forums 'endless sphere' have done this upgrade.
 
If he wants it to go quicker, tell him to look on line, there’s a software mod that tricks the limiter into thinking the wheels are smaller than they are, hey presto, your e-bike is now shifting at motorbike speeds, without having to up the motor size.
 

Pale Rider

Legendary Member
The Suntour motor on the Carrera is difficult to de-restrict.

Replacing the motor might not do what he wants because quoted watt numbers are only a guide.

The Carrera motor is quite perky for what it is, so he could buy a '500w' motor which is no faster.

Then there's the possibility the new motor won't shake hands nicely with the existing electronics.

If he must have a faster bike, buying a cheap hybrid and converting it would be a better option.

Leaving aside watt ratings, anything that assists above 15.5mph would be illegal.

You may not want your hands on that.

Building the bike is no offence, but if you did it for yourself you would have control - and responsibility - over how it was used.
 

gbb

Legendary Member
Location
Peterborough
An example of folk updating their motors etc. I just opened FB and saw an advert for a 1500w motor, 48v, 15.5 ahr system. He's built ot well from the looks of it and explains.
Done 100 miles, no problems. Nearly reaches 37 mph. Battery is like new and has only been charged 7 or 8 times.

Sounds great until you do the simple maths....its doing 15 miles maximum to each battery charge.
 

CXRAndy

Guru
Location
Lincs
He is sacrificing range for outright speed I think there are better ways of utilizing an ebike motor setup
An example of folk updating their motors etc. I just opened FB and saw an advert for a 1500w motor, 48v, 15.5 ahr system. He's built ot well from the looks of it and explains.
Done 100 miles, no problems. Nearly reaches 37 mph. Battery is like new and has only been charged 7 or 8 times.

Sounds great until you do the simple maths....its doing 15 miles maximum to each battery charge.
 
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