I've been riding an electrified 48V hub-drive Hybrid-style commuter bike to work everyday for the past two years and I'm starting to seriously think about converting a mountain bike to make trail riding a blast.
For motors I was hoping to reuse something I already have, but can be swayed to try something new. Right now I have:
A spare gng 650W mid-drive kit I played around with for awhile but never was too happy with (http://www.gngebike.com/60v650w-brushless)
Or an older ebikekit.com 500-1000W direct drive rear hub motor (link to new kit http://www.ebikekit.com/electric-bike-conversion-kits/rear-500w-1000w-direct-drive-conversion-kit/)
For a bike I have a 2003 Klein Palomino full suspension bike with disk brakes (http://www.bikepedia.com/quickbike/BikeSpecs.aspx?year=2003&brand=Klein&model=Palomino)
The controllers I have right now are a 9 FET 4110 72V Infineon brushless controller from Ed Lyen and a junky one that came with the GNG kit.
While I have many questions about the setup and welcome any suggestions my main questions arise with the battery. I have rode around on a 48V '12ah' Lipo from aliexpress.com that is showing signs of age after a year and a half of use, and even toyed around on a 48V lead acid pack that was heavy and ended up leaking. However, for this build, I was hoping to go to 72V to make the bike a little more exciting on the trails.
Right now I am deciding if I want to play it safe and buy a ready made LiPo4 cell from a reputable supplier. Right now I am looking at:
Ping battery's 60V 10AH (http://www.pingbattery.com/servlet/the-18/60v-10ah-lifepo4-lithium/Detail)
BMS Battery's 72V 10AH (http://www.bmsbattery.com/packs/427-48v-10ah-38120-lifepo4-battery-16-cells-ebike-battery-pack.html)
Em3ev's 50V FrameBattery (http://em3ev.com/store/index.php?route=product/product&path=35&product_id=158)
Right now my budget for the battery is $600 max. Goal for distance is 10-15 miles, and ideally fit in the frame of the bike. Each of these batteries isn't without its drawbacks. Only BMS supplies a battery with my 72V requirement in the price range I want it, but it doesn't look like it will fit well in/on the frame I have.
I could always go down the path of the homemade RC lipo pack, but this route is new to me, so suggestions are always welcome. If I did go this route I would build the pack out of 6S 5000 mah packs from hobbyking.com, although I'm not sure what C rating to shoot for.
A big question in my mind about building my own pack is how to utilize a 'safe and effective' BMS circuit. Anyone with experience in homemade packs suggest a BMS or a balancing charge scheme that would work? I am also worried about the RC pack's longevity, I want the pack to last a year. Ideally the pack would also not burst into white-hot purple colored flames.
For motors I was hoping to reuse something I already have, but can be swayed to try something new. Right now I have:
A spare gng 650W mid-drive kit I played around with for awhile but never was too happy with (http://www.gngebike.com/60v650w-brushless)
Or an older ebikekit.com 500-1000W direct drive rear hub motor (link to new kit http://www.ebikekit.com/electric-bike-conversion-kits/rear-500w-1000w-direct-drive-conversion-kit/)
For a bike I have a 2003 Klein Palomino full suspension bike with disk brakes (http://www.bikepedia.com/quickbike/BikeSpecs.aspx?year=2003&brand=Klein&model=Palomino)
The controllers I have right now are a 9 FET 4110 72V Infineon brushless controller from Ed Lyen and a junky one that came with the GNG kit.
While I have many questions about the setup and welcome any suggestions my main questions arise with the battery. I have rode around on a 48V '12ah' Lipo from aliexpress.com that is showing signs of age after a year and a half of use, and even toyed around on a 48V lead acid pack that was heavy and ended up leaking. However, for this build, I was hoping to go to 72V to make the bike a little more exciting on the trails.
Right now I am deciding if I want to play it safe and buy a ready made LiPo4 cell from a reputable supplier. Right now I am looking at:
Ping battery's 60V 10AH (http://www.pingbattery.com/servlet/the-18/60v-10ah-lifepo4-lithium/Detail)
BMS Battery's 72V 10AH (http://www.bmsbattery.com/packs/427-48v-10ah-38120-lifepo4-battery-16-cells-ebike-battery-pack.html)
Em3ev's 50V FrameBattery (http://em3ev.com/store/index.php?route=product/product&path=35&product_id=158)
Right now my budget for the battery is $600 max. Goal for distance is 10-15 miles, and ideally fit in the frame of the bike. Each of these batteries isn't without its drawbacks. Only BMS supplies a battery with my 72V requirement in the price range I want it, but it doesn't look like it will fit well in/on the frame I have.
I could always go down the path of the homemade RC lipo pack, but this route is new to me, so suggestions are always welcome. If I did go this route I would build the pack out of 6S 5000 mah packs from hobbyking.com, although I'm not sure what C rating to shoot for.
A big question in my mind about building my own pack is how to utilize a 'safe and effective' BMS circuit. Anyone with experience in homemade packs suggest a BMS or a balancing charge scheme that would work? I am also worried about the RC pack's longevity, I want the pack to last a year. Ideally the pack would also not burst into white-hot purple colored flames.