electric bikes 48v image
yb
I am building a 48V electric bike that will have two 24V batteries on it. I was wondering if I would need to buy one charger for a 48V battery and charge them in series. Or, would I need to buy a 24V charger and charge them separately?
Answer
I would go with the 48V charger and charge both of them at the same time.
I would go with the 48V charger and charge both of them at the same time.
need help on changing from 48v to 12v?
david p
i have a electric bike because of a bad knee. trouble is soon the four 12v batteries life will be spent. i would like to convert to a heavy duty 12v car battery which i could also charge with my 80watt bp solar panel. i couldnt get any specs on the motor in the rear hub. what do i need? help much appreciated.-if it is a convertor of 12v to 48 were would i get that and from who could i get advise.
Answer
Chances are that suitable 12v motors are not available for the application today. Otherwise the bike maker would have chosen it. However, you never know.
The motor should have its power consumption displayed somewhere. That may be expressed in watts (like micro-wave), and/or current requirement in amperes (amps). Usually the current displayed is the steady state current. Startup current is usually much heavier. That is a start, how much power the motor needs to put out.
The second thing you need to know is the torque the motor generates. This is not necessarily displayed. The motor must overcome the inertial leverage of the large diameter of the wheels. This basically dictates the torque requirement. Of course if you find a replacement whose torque is a little low, it simply will accelerate slower, or you can help it with some pedalling. But you do want enough torque so that on level ground, it can at least keep pushing the bike along. If you can find the manufacturer of the motor, it is a way to track down the specs including the torque. With luck, the company has a website from which you may be able to pin down the motor specs.
Conversion of 12v DC to 48v DC with the likely current load you need for the motor is probably not too practical. The power requirement is likely to be too high for today's components. You will also lose a fair amount of power in the conversion. That is why I am assuming a motor replacement.
Good luck & have fun.
Chances are that suitable 12v motors are not available for the application today. Otherwise the bike maker would have chosen it. However, you never know.
The motor should have its power consumption displayed somewhere. That may be expressed in watts (like micro-wave), and/or current requirement in amperes (amps). Usually the current displayed is the steady state current. Startup current is usually much heavier. That is a start, how much power the motor needs to put out.
The second thing you need to know is the torque the motor generates. This is not necessarily displayed. The motor must overcome the inertial leverage of the large diameter of the wheels. This basically dictates the torque requirement. Of course if you find a replacement whose torque is a little low, it simply will accelerate slower, or you can help it with some pedalling. But you do want enough torque so that on level ground, it can at least keep pushing the bike along. If you can find the manufacturer of the motor, it is a way to track down the specs including the torque. With luck, the company has a website from which you may be able to pin down the motor specs.
Conversion of 12v DC to 48v DC with the likely current load you need for the motor is probably not too practical. The power requirement is likely to be too high for today's components. You will also lose a fair amount of power in the conversion. That is why I am assuming a motor replacement.
Good luck & have fun.
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