Kleinbottled
1 mW
- Joined
- Aug 10, 2012
- Messages
- 17
Let me start saying I'm new to this stuff. I've been reading (mostly here at ES) about E-bikes for a little over a week. It's been getting ALL my spare time. First project is already underway with a battery en route from Li Ping 48v 15ah. Motor will be of the 600-1000w 10t geared hub motor variety. I think I sorta have a bit of an understanding of the motor/ battery combination. However, when it comes to controllers and cycle analysts my head starts to spin a little. I've got a few questions. Links to threads or w/e kind of answers you all can give will be much appreciated.
So I get that my 15ah Ping battery likes to be discharged at <30A continuous ideally. 25A gives me just under 1000w output from the motor according to the simulator at ebikes.ca. This seems just about perfect. Motor should be safe and the battery happy, also being within local law's 1000w limit is a bonus. The obvious thing to do would be the select the appropriate 48v 25a controller and call it a day. But its not that simple is it? I want to run a cycle analyst. If I want to be able to drop the current limit with a CA I want one that has a direct connect ability with the controller right? I have a section almost 2 miles long on my commute that is ~6%. If i wanted to baby my motor/battery up this climb is it better to limit the current thru the CA ( maybe 18-20A ) or to back off the throttle a little? Is the 'speed limit' on the CA controlling throttle setting or current limiter or...?
While we are limiting current it brings up the question of going bigger. If i'm trying to accelerate with traffic downtown I might like to have the little extra shove 30A would give me. Since its not sustained that should be fine for battery/motor, but now we need a 30A controller. Cost not a factor, Is there a significant drawback to using a 30A or 35A controller and limiting it to 25A most the time through CA? Is it hard on the controller to do this? or maybe easier? i.e. reliability concerns. Is it more resistance? enough to matter?
On sort of a side note, the idea of a 'soft-start' seems pretty good. Especially if you have friends that are going to want to try your bike,. But also just to pamper your setup. Would a smooth throttle finger be just as good provided I'm not loaning the bike out? I Know the 35/50a BMC controller has a soft start jumper. I hear the controllers Cellman used? to sell sorta had one built in. What about the ones that come with his mac kits now? Do the Lyen edition controllers have this capability?> Any others controllers do this? Or other ways to implement some sorta of protection from the ham-fisted? Just curious. Thanks
So I get that my 15ah Ping battery likes to be discharged at <30A continuous ideally. 25A gives me just under 1000w output from the motor according to the simulator at ebikes.ca. This seems just about perfect. Motor should be safe and the battery happy, also being within local law's 1000w limit is a bonus. The obvious thing to do would be the select the appropriate 48v 25a controller and call it a day. But its not that simple is it? I want to run a cycle analyst. If I want to be able to drop the current limit with a CA I want one that has a direct connect ability with the controller right? I have a section almost 2 miles long on my commute that is ~6%. If i wanted to baby my motor/battery up this climb is it better to limit the current thru the CA ( maybe 18-20A ) or to back off the throttle a little? Is the 'speed limit' on the CA controlling throttle setting or current limiter or...?
While we are limiting current it brings up the question of going bigger. If i'm trying to accelerate with traffic downtown I might like to have the little extra shove 30A would give me. Since its not sustained that should be fine for battery/motor, but now we need a 30A controller. Cost not a factor, Is there a significant drawback to using a 30A or 35A controller and limiting it to 25A most the time through CA? Is it hard on the controller to do this? or maybe easier? i.e. reliability concerns. Is it more resistance? enough to matter?
On sort of a side note, the idea of a 'soft-start' seems pretty good. Especially if you have friends that are going to want to try your bike,. But also just to pamper your setup. Would a smooth throttle finger be just as good provided I'm not loaning the bike out? I Know the 35/50a BMC controller has a soft start jumper. I hear the controllers Cellman used? to sell sorta had one built in. What about the ones that come with his mac kits now? Do the Lyen edition controllers have this capability?> Any others controllers do this? Or other ways to implement some sorta of protection from the ham-fisted? Just curious. Thanks