Battery an A123 AMP20 72V, in two 36V sections mounted pannier style on back rack
Component list full & complete, vetted by Justin
Question of spacers & washers for an 8-speed freewheel still undecided whether 7 or 8 speed
Rim & Spokes finalized Alexrims DX32 with Sapim spokes by JHR
Motor & Wire Upgrades
Putting it together
I got derailed from my Ross Mt Whitney MTB, MAC 8T, OSN A123 72V build for several reasons:
- Paul at EM3ev would not warranty the setup as too many amps for the motor
- I'm uncompromising on my need for speed per expected usage
- the MXUS buy came along with a motor that I believe more suitable for speed without melting
- going those speeds >50mph, I need a better full suspension frame and disc brakes
Also inspiring was the availability of well priced used full suspension mountain bikes of a high calibre, like these: site:craigslist.org giant trance -or- site:craigslist.org trek fuel -or- site:craigslist.org jamis dakar. Tuesday 14-Oct-14 picked up a new Trek Shift 3 from local bike shop which I love. May need to hack to get the new wheel to fit.
And then to top off the incredible possibilities in today's highly wired marketplace, are the availability of A123 system ANR26650M1A 2300mah lifepo4 battery with 30c high discharge rate. In speaking with flybatt on Skype, I ascertained those cells will be "US$6.5 MOQ 100PCS if you need welding service, need to add extra US$0.3/PC", so $6.80 per cell with welded tabs. It just does not get any better. Though I may stick with an AMP20 battery pack, back rack mounted, 36V on a side, pannier style.
I'll add into that mix, per the USA Group Buy for MXUS 3000W Hub Motor $200 + Shipping thread:
teslanv wrote:I've got an 18FETx4110 Lyen looking for its next victim.
A 12FET would probably be fun as well.
Step up to 4115 FETs and really have some fun.
So, had to report that news and start this build thread.arkmundi wrote: Muchos gracias.... so the 18 fet IRFB4110 Infineon Controller would be good?
Update 2015: Despite any indication otherwise, I have not yet bought a controller and am in the market for one capable of taking on a 96V A123 AMP20, 400+ amps. Maybe a 120v Sabvoton controllers from zombiess?? The 18 4110 mosfet Infineon controller from EM3ev, the most capable he offers, is not up to the task I believe.