DahonElectric
100 W
- Joined
- Jul 15, 2008
- Messages
- 149
Drunkskunk said:From Ping's website: http://www.pingbattery.com/servlet/StoreFrontDahonElectric said:As I recalled from the Ping ebay website, their batteries are rated 1C sustained and 2C peak or is it? Battery voltage is not a true indicator of battery prowness. C rating is, and my NiCad 5C rating works damn good on the hills, being only a 36V. You can have a 48V 10Ah with a 0.25C rating and it is not going to deliver the load requirements compared to say a 36V 10Ah with a 2C rating or even a 24V 10Ah with a 4C rating from ebikes.ca. Operating voltage is what gives the initial burst, but for sustained output, you need a high C rating and that comes at a price.
DE.
its 2C on the V2, and claims the V1 is 2C as well, though most people who have posted there experiances with the V1 say its best as a 1C battery. He's now issued the V2.5 which is also 2C.
Volts give you speed. higher voltage pressure gives higher RPMs from the motor, but it's relitive. 24V on one motor might be as fast as 48 volts for another. Commonly we say increasing the amps gives more torque, but thats a convention, and not entirly true. Its an increase of wattage that increases the torque. increasing the ampreage without increasing the voltage gives you more torque at the same speed, theoreticly.
Higher voltage gives you speed on a lower operating motor voltage, this is called over-volting. If the motor needs 48volts to operate at its proper efficient speed, then it needs a 48 v battery pack. There is no speed gain. There is a speed loss if you operate it at 36volts. Voltage is voltage. As far as the ebike electronics is concerned, it is only looking at the battery to operate properly with the proper operating voltage. Remember that you are not only over-volting the motor, but the controller too! Voltage is voltage and a battery can have a voltage reading across its open terminals, but if it has no ability to deliver current, it does nothing to the device but the battery voltage will sag dramatically. If the battery can deliver sustained current, not only it will not sag dramatically but be able to continue to service the load of the motor. Remember that the battery is providing the operating voltage for the motor. If the battery voltage sags dramatically down due to load, it will no longer provide the proper operating voltage of the motor and thus, the motor slows down. That was what I meant in the earlier message that if the eZee motor can function fine with a 36V battery pack, having a pack with a higher C rating will ensure that the battery will be able to service the load during an uphill climb. However, if the 48v pack has the same C rating as the 36v then all is even better! If the 48v has less C rating and you are loading the battery beyond the means of delivery, you simply will kill the battery sooner than later. It's good to see that Ping has improved their batteries quite a bit, but I am still a bit skeptical about their claims. Earlier Pings did not fair too well on high loads as this original poster will be planning on using the ebike for.
DE.