circuitsmith
Member
- Region
- USA
- City
- Washington DC
Greetings,
I've been e-biking for 21 years, commuting to work 20 years, until I retired last April.
First with a Currie USPD kit on a (low end) Cannondale road bike.
After a couple years I upgraded from the massive SLA bricks to NiMH.
First 6V sub-C packs and later Roomba vacuum packs.
Six 14.4V 3.3AH packs arranged 2s3p for 28.8V 9.9AH.
I used 15 pin circular military style connectors to charge the packs all in series (~108V), as nickle batteries don't like parallel charging.
The Cannondale was stolen (outside a night club while I was inside playing sax in a band), so I found a Currie e-bike with no motor on Craigslist.
I built a LiPo pack to fit in the Currie bat box and designed a BMS using an Arduino Nano.
I used that setup for nine years, replacing the (Turnigy) cells every 3 years, out of fear of vibration causing trouble.
I got tired of the Currie's heavy frame after a year, so I bought a Schwinn Frontier MTB with a chrome-moly frame and moved the USPD hardware over to it.
Two years ago I felt the need for more speed, so I bought a Bafang BBS02 and put that on the Schwinn.
Had a lot of fun playing with the parameters.
I pretty much stay on paved roads and trails, with the exception of photographing the C&O canal last fall, a work in progress.
I've been e-biking for 21 years, commuting to work 20 years, until I retired last April.
First with a Currie USPD kit on a (low end) Cannondale road bike.
After a couple years I upgraded from the massive SLA bricks to NiMH.
First 6V sub-C packs and later Roomba vacuum packs.
Six 14.4V 3.3AH packs arranged 2s3p for 28.8V 9.9AH.
I used 15 pin circular military style connectors to charge the packs all in series (~108V), as nickle batteries don't like parallel charging.
The Cannondale was stolen (outside a night club while I was inside playing sax in a band), so I found a Currie e-bike with no motor on Craigslist.
I built a LiPo pack to fit in the Currie bat box and designed a BMS using an Arduino Nano.
I used that setup for nine years, replacing the (Turnigy) cells every 3 years, out of fear of vibration causing trouble.
I got tired of the Currie's heavy frame after a year, so I bought a Schwinn Frontier MTB with a chrome-moly frame and moved the USPD hardware over to it.
Two years ago I felt the need for more speed, so I bought a Bafang BBS02 and put that on the Schwinn.
Had a lot of fun playing with the parameters.
I pretty much stay on paved roads and trails, with the exception of photographing the C&O canal last fall, a work in progress.
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