So I'm interested in purchasing a 8fun mid-drive kit, but i haven't been able to find a reliable vendor for the system. So i was wondering where the people in this forum were getting their kits and batteries from.
Agreed. Paul is also a great resource to ask questions before you purchase. He may not reply the fastest, but he always replys with a well explained answer.Another vote for Paul at http://www.em3ev.com/. Paul is in fact a Pom so English is his native language I would also consider getting the battery from Paul as well. They seem to be qood quality batteries. I am happy with my kit which I got from Paul and fitted to my Bacchetta Giro 20 ATT.
I went with the 48v 11ah 29E cells paired with a 750w Bafang. I wanted range over power in my budgeted amount.
The settings with your controller are really going to drive what battery you'll need. My settings keep the current draw pretty low, and I'm only running at 350w most of the time. This works well to maintain 22 mph but it falls apart in a headwind.
If i get stuck in a strong headwind, I have the throttle set up to give 100% in all PAS modes. This gets me the full 750w and the thing hauls at 22-23 in the strongest headwinds. Headwinds that would bring my Stromer to its knees. This battery is not a good choice for this all the time though. I would go with 25r or 20r cells if you think you need this type of power all the time.
What barrery you'll need will depend a lot on your application and your programmed settings.
If you use the throttle, yes. You'll probably beat most traffic across the intersection.I bookmarked his site. I've been thinking about that 750 watt Bafang. Looks like good choice. How is the acceleration? Can you keep up with traffic when the light turns green?
If you use the throttle, yes. You'll probably beat most traffic across the intersection.
In normal PAS mode, the controller brings the power on more slowly. Acceleration is really good (again, depends on your programmed settings) but shifting with this much power/acceleration sucks. There are several ways to improve shifting like pedaling backwards, stop pedaling, or tapping the brake lever but all of them still suck and don't feel natural to me. Even after more than a month riding it, I still dislike the shifting. It's not a deal breaker, its just the biggest negative of the system. The 2nd biggest negative is that it's not torque sensing.
I still prefer my Stromer for fast acceleration off the line and accelerating up to 20mph but the Bafang is working out perfectly for what I bought it for -> a winter commuter that is going to get the crap beat out of it until Spring.
the latest news on the em3ev says to not mess with the programming because if u do it wrong the controller can die and that's not under warranty?
I have a lot of miles on my 36V 500W BBS02. Not sure what they mean by "reprogramming", but I've changed the number of PAS levels from three to five and top speed from 32KPH upto 45KPH with the appropriate 700c wheel size selected.
Thanks. I don't have any issues with the two mid-drive units I installed. But I certainly understand why some people want to see what parameters they can change for better performance and I also understand why the alterations would void the warranty.
Em3ev's standard programming is actually pretty good. It strikes a good balance between range and power. I bought the cable to reprogram the controller from eBay and only changed one thing, which was level 9 is 100% motor power. This is only used in situations where I have to fight a constant headwind for a really long distance and dont want to hold the throttle the entire time to keep maximum power at the motor. In these situations, it will only do 20 mph and that's with all 750w at the motor + me pedaling.the latest news on the em3ev says to not mess with the programming because if u do it wrong the controller can die and that's not under warranty? How hard exactly is to to reprogram the controller with a setting similar to what you have set up, Gus, because from what you said it sounds like your set up is pretty good with longevity and power consumption but then u can use the throttle when u need extra power.