Optibike USV 500W from http://optibike.com/optibike-usv.html
72V Infineon Brushless Controllers (LYEN's Edition): Sensorless 12 FET 72V Infineon BL Controller(no regen)EC124310L from http://www24.brinkster.com/lyen/beta/
four 38.4 volt 10 AH Batteries connected in series & parallel to form one 76.8 volt 20 AH pack from http://us.itselectric.ca/38V_Lithium_Phosphate_10Ah_battery_pack_LiFEPO4_p/38.4v-lithium-phosphate-10ah.htm
stats: top speed on the flats about 36 mph no pedaling, can only manage 7th gear or the motor stalls. with a bit of pedal assist to keep the motor spinning at high speed, can reach speeds as high as 44 plus mph. on a slight down grade at 8th gear, got it as fast as 48 mph. fastest steep downhill run at full throttle at 9th gear and pedaling = about 62 mph.
range at full throttle is about 32 miles with the 76.8 volt 20 AH pack. it's no longer limited by the stock controller that forces you to conserve energy and pulse the motor on & off. suprisingly the motor is holding up to the continuous power runs, even up hills at continuous throttle. motor gets hot but has not broken down yet. so far about 400 miles on the odometer.
shaky footage of the bike in action.
http://www.youtube.com/watch?v=XhZhmj3gREg
May 15, 2011
1000 mile update
all components are doing fine, no replacements needed so far.
recent ride stats: on/off road ride, range 54.38 miles
consumed 28 Ah or 2.15 Kwhrs, time 2 hr 35 min ( includes many stops to check out the scenery :)
trailer full of LiFePO4 pouched polymer batteries @ 76.8V 30Ah = 48 lbs
top speed steep downhill 62.41 mph, climbs from 18-30 mph depending on % grade, flats up to 42-44 mph.
average speed 20.95 mph (includes lights, stop signs etc...)
Start 83.1 V, end 69.9 V
http://twitpic.com/4xt046
Dan, here are the answers to your questions...
I read your Visforvoltage page... tell me more about your overvoltage
Opti, bcause I am running 20 ahrs of A123 nano at 41.5V,
Do you have a cycle analyst? What is the peak steady state power your
Lyons controller/motor will allow?
answer:
i am using this http://www.ebikes.ca/store/photos/CA-LSA.jpg at the moment.
a cool little tool, i keep it at the watt discharge screen, i normally see
a peak watt discharge of 2400-2500 W at 74 V nominal.
what is your average power for a ride?
answer:
Power consumption at 74 V nominal for Lipo or 76.8 V nominal for LiFePO4 can vary from 10 Wh/mi to as high as 46 Wh/mi. more hills, speed & less pedaling = more Wh/mi.
On your 54 mile ride recently, you averaged about 39 whr/mi. That is
a very high average. Is that going to the wheels or being lost in the
motor as overdrive?
answer:
not really high given the speed...20.95 mph including all stops at red lights & stop signs & scenery breaks is a very high average speed...
if i was on a circular track the average speed would be 39+ mph at current gearing...the bike is pushing alot of wind at that speed...
My stock, 2year opti bat gives my 20whr/mi typ, but can still average
22mph with mod effort, and 25 mph ave of I push hard on a flatter
route.
answer:
ur stock Opti bikey is a turtle when compared to a modded 72 V Opti Hare ; )
My new A123 today averaged 26.4mph over 21.5 miles, and 27 whr/mi on
that flat commute route home. I had to induce the BOOST mode up hills
(pop the wheelie technique) . It looks like the Opti has hiccups,
but I saw 1400W and 30-40 A on my ca from the boost mode. The battery
loved it. I kept my momentum. My opti controller is limiting power.
The stock cntrlr allow about 16 amps and 600W steady state.
Answer:
i don't keep track of the Amps on my CA, it's easier to use the watt display,
when i'm riding, i do not shift to a higher gear until the watts drop down below
1400-1500 watts.
i'm pushing 2500 Watts peak with this mod.
your A123 pack can handle high amps if it's the real deal, you just need a higher power controller to extract it's potential.