I get 88whr per mile with my 72V bike. I have 6 PC1500 ~50aH AGM batteries. I figure about 30 miles to 80% DOD. The most I have driven is 24 miles to ~65% DOD. Typical speed is about 45MPH. I agree you will need more than 50aH. me
On 5/6/08, damon henry <[EMAIL PROTECTED]> wrote: > I think you will need closer to 80-100 ahr of those batteries to get 50 > miles. With a 100 ahr pack of Nicads at 48 volts I had a 35 to 40 mile > range at 50 mph. The pack weighed 230 lbs. Your lithiums will be quite a > bit lighter and since you are running at 72 volts instead of 48 you would > have 50% more overall capacity than I did. Weight however is not much of a > factor once you get up to cruising speed. Once you get up to speed it is > mostly aeordynamics, and this is one factor where all motorcycles suck. > > With only a 50 ahr pack you are hoping to do 1 mile per ahr which I think is > a bit over optimistic except for at very low speeds. You should compare > notes with some of the other 72 volt motorcycles and see how many ahrs per > mile they get. I know at 48 volts I average 2.5 - 3 ahr per mile. > > damon > > > > > ________________________________ > > > Date: Tue, 6 May 2008 16:13:07 -0700 > > From: [EMAIL PROTECTED] > > To: [email protected] > > Subject: [ElectricMotorcycles] Before we proceed on the conversion... > > > > > Hello again, > > > > Thanks for all the advice on bikes and weights. The bike we settled on was > a 250cc 89 Ninja. ((This was a bit of a compromise, as we'd have preferred a > 200 lb ICE > > bike instead of a 300 lb one). > > > > Our goal again, is to do an ev-conversion with 50 mph top speed and a > 40-50 mile range. Doing this project with a like-minded partner, we've > expanded our budget, so Lithium looks like the best bet. > > > > We'd like to get your advice on this configuration: > > > > Batteries: > > 72V, 50AH LFP pack w/BMS from Hipower > > > > Controller+Motor kit which contains: > > E-tek-RT Motor, Alltrax AXE 7234 > > [I know there were some negatives regarding the older version of Etek, but > what about this one?] > > > > Info about batteries: > > > > http://www.chinabatteries.net/www/en/prod.htm > > > > weight is 92 lbs, >1000 cycles > > (>2000 cycles under optimal discharge conditions according to > manufacturer.) > > > > Some numbers: > > > > WH/lb = 39.13 > > [Compare w/ 16.4 WH/lb for an equivalent SLA system using B&B batteries] > > > > approx cost: $2650 for a 24-cell pack, $3500 incl BMS. > > > > Cost/KWH = $730 excl BMS > > Cost/KWH/cycle = $0.73 assuming 1000 cycles > > Cost/KWH/cycle = $0.37 assuming 2000 cycles > > [Compare with $0.61 for an equivalent SLA system using B&B batteries, > assuming 500 cycles] > > > > Total estimated cost (incl bike): $5500. Again sharing the bike with a > friend helps ease the bite on the wallet. > > > > Thanks, > > Sri Subramanian > > Roy Prince > > > > > ________________________________ > Stay in touch when you're away with Windows Live Messenger. IM anytime > you're online.
