Recent content by saucerful

I electrified a Bike Friday NWT (folding 20" wheel bike) with a Bafang G311 Fast Wind kit and a 52 V em3ev battery. I used what I thought were conservative settings (20 mph speed limit and 36 Nm torque limit). But after 4 months and 500 miles it failed: loose magnets and one was rusty (thanks...

Nvm got it open by tapping the axel with a rubber mallet!

Hi, this is probably trivial but I am new to it. I am having trouble opening my Bafang G311 front hub motor. Grin has a video for the G310 (rear hub). I was able to get the cap off so I can see the motor but the case is still on-- see attached image. I could continue with disassembly but in the...

@amberwolf, thanks this is so helpful. I'm suspecting it is a loose magnet... I wonder if this video I took of the Phaserunner autotune with the sound audible would narrow it down? I'll open the motor up soon. Also I wonder whether the (default) 90 C threshold (when current limiting starts)...

Seems so. The software said something like "Bafang hall sensor pattern detected." The motor is definitely still producing torque, just less so. It's especially noticeable when the throttle is first engaged-- little to no torque. But going up a hill it definitely was still assisting me. So...

Hello, I have a Bafang G311 (front hub geared) motor from Grin with Baserunner controller and 52V em3ev battery. The kit is about 4 months old with 400 miles on it. A couple days ago I noticed the following in order: Fluttering sound, not unlike the usual sound, but louder, at times loud enough...

Whoops, good question. I'm open to reasonable offers. Keep in mind that I can send it back to Grin for a full refund, minus a hefty shipping fee. But I need to decide quickly whether to do that so if you are interested please let me know asap. Thanks!

See Grin's website for detailed item descriptions: Pull Tripwire (50cm Cable) 12 Pole PAS with Chainring Mounted Magdisc I paid those prices ($24 and $39, respectively). Purchased last month, brand new in original packaging. I could return them to Grin but shipping is too much. So will not...

I'm hoping to build a lithium titanate battery pack from cells off eBay/AliExpress and looking for BMS recommendations. The BMS choice should take into account: The voltage of LTO cells is about 2.3 V nominal, 2.9 V charged, and 1.6 V discharged (the exact numbers vary by manufacturer). About...

I have a 20" folding bike (Bike Friday) that I'd like to electrify with a Bafang G311 hub from Grin. They recommend a fast wind (10.5 rpm/V) for 20" wheels which they sell with a 36 V battery: 36 V * 10.5 rpm/V = 378 rpm But I want to use a 48 V battery because I have a better source for...

Thanks docw009 and bengy2022! Those are both nice options. Does anyone happen to know how likely it is that the "Seiko IC BMS" on those UPP batteries will balance before reaching a full charge? I am planning to typically charge to less than full capacity in order to maximize battery life. (Any...

I'm looking for a quality battery pack (preferably including Hailong type enclosure), which my research tells me (correct me if I'm wrong) means brand name (non-Chinese) cells. Unfortunately the only brand name cell packs I can find are more than I want to spend (say $400 max, preferably less)...

I was about to post myself on this topic because I found some very affordable (?) batteries on eBay that claim to use 4800mah Panasonic 21700 cells and the NCR21700T is the only such cell I can find. Are the cells legit? They seem light, with 4800mah for a 45g cell according to Alibaba listing...