neiltoe wrote:Thank you again for the solid advice.
I just wanna spew some random thoughts out here as having this eBike has changed a lot of my thinking.
Does anyone have any resources for maybe using farad capacitors and a gearing system for direct drive eBikes? I was thinking about when I used to play with car stereos that I could see my whole power system bottom out on a big bass section and how I used a farad cap to compensate. This might be useful on a full throttle take off. Would that be applicable to these sort of systems? Also since we peddle through a gear system couldn't an external motor be configured with a gear system to improve ratios?
Please don't think I am crazy for these questions.
Apparently you will/would be better off doubling up your battery pack than adding Caps. On a hard take-off your Cycle Analyst should be
set that you are not using more than between 2500-3000 watts. So..... build your battery pack accordingly. Not worth the weight of carrying
the caps and put that weight into more capacity of a bigger battery pack.
If you decide to run 48 volts at 10amp hours and you want to do hard pulls off the line because you have many stops and starts, then run 48 volts at 20amp hours.
I'm hoping that you know what "C" rating means. If a 48v 10a/h pack is rated at 2C, then the max you should pull from the pack should be 48v @ 20amps which would be 48 x 20 =960 watts to the motor. A pack of 48v 20a/h that is rated at 2C then your max 48v x 40amps = 1920 watts to the motor.
In other words... a/h x C number is max current the pack can provide without damage.
10 ah pack at 2c is 20amp max draw at your packs voltage (The 2c packs are usually the beginner pack that is solid if used correctly... like PING Packs)
20 ah pack at 2c is 40amp max draw at your packs voltage
if the pack is rated at 30c and you have 10ah...... you are talking about 300amps! at your pack voltage, and if that voltage is 48v you've got 14,400 watts
to your motor and most ebike motors would be melted! Let alone 600 plus dollars for a controller to handle the 300amps!
This is either the a123 packs or the Zippy packs. Caution must be taken and understanding battery technology is a must! For your safety and others around you and yours or others property!
This electric bike stuff is awesome! Read! Learn! Apply what you've learned! Make mistakes! Get better on each build!
Most people here build more than one. I've built 4 and ready for 5! lol
Lots of great info here!
Tommy L sends...\\m//