Ebike in need of more power by adding batteries..
A 250W electric motor will only pull about 5.1 amps at 48V. The lead acid batteries that come with the bike are more than capable of 5A of output without dropping voltage. Therefore, wiring a second pack in parallel will not do anything to increase the available torque or power from the motor. All it will do is increase the time/distance you can ride the bike on a single charge.
Also, you should take care that wiring lead acid batteries in parallel is not always safe, especially if you are wiring newer batteries in parallel with older batteries. A common failure mode is for one of the cells (there are several in each battery) to short circuit. For a series-wired pack, this only decreases the voltage, but if you have two packs in parallel, you'll end up with one pack having a lower voltage than the other, and it will draw tremendous current out of the other pack, possibly causing an explosion and great bodily harm.
If the performance changed suddenly after hitting a bump, then you probably broke something in the hub. If the motor has multiple windings, it's possible one of them became disconnected from the power source. This would decrease the available torque and power. I would look into having it repaired.
Be careful, and ride safely.
Nov 07, 2009 |
Electric Bicycle Motor, Bike,electric...