OK, luckily the weather is just getting to the point I can start collecting
some more data. I'll keep you posted on numbers as I may be remembering the
nicad bike wrong from last year and my lead bike (now sold) was 117 whr/mile
but on a commute with 8 miles of 60 mph and a 45 mph average for the trip. This
is averaged from several trips back an forth. In fact, if anyone is intrested
here is the data accumulated by GPS and Link 10 of this bike
www.evalbum.com/623.
date
miles avg speed Kwh WH/M Gear Ratio Dir Top Speed Temp
7/17/2006 #DIV/0! 13.1 37.4 1.51 115.2672 4 WestBound 65 75
7/17/2006
13.4 42.2 1.77 132.0896 4 East 66.9
7/18/2006
13.2 35.2 1.45 109.8485 5.45 WestBound 64.7 72 7/18/2006
13.5 39.5 1.6 118.5185 5.45 east 65.2
7/19/2006
13.1 39.5 1.41 107.6336 4.62 WestBound 70.1 80?
7/19/2006
13.4 39.8 1.67 124.6269 4.62 east 68.2 90 7/20/2006
13.1 43.7 1.65 125.9542 4.62
67.4 72 7/20/2006
13.4 25.1 1.6 119.403 4.62 e 63.1 72 7/21/2006
13 41.3 1.6 123.0769 4.62 WestBound 63.8 70 7/21/2006
13.4 30 1.64 122.3881 4.62 e 64.4 84 7/24/2006
12.9 42 1.44 111.6279 4.62 WestBound 62.9
7/24/2006
13.4
1.59 118.6567 4.62
7/25/2006
13.1 40.3 1.51 115.2672 4.62 WestBound 61 81 7/25/2006
17.3 33.6 1.97 113.8728 4.62
62.5
7/26/2006
13.7 39 1.57 114.5985 4 WestBound 70 81 7/26/2006
13.4
1.91 142.5373 4
7/27/2006 23
#DIV/0! 4
7/27/2006 23.3
41.5
#DIV/0! 4
65 91 7/28/2006 19.8 12.9 45.3 1.38 106.9767 4
WestBound 67.2 73 7/28/2006
13.5 35.2 1.8 133.3333 4 e 64.7 93 8/1/2006
12.9 40.4 1.52 117.8295 4 WestBound 68.3 66 8/1/2006
13.5 22.6 1.59 117.7778 4
62.3 75 8/2/2006
12.9 40.7 1.51 117.0543 4 WestBound 63.6 70 8/2/2006
13.5 27.8 1.61 119.2593
63.6 81 8/3/2006
13
1.49 114.6154
WestBound
8/3/2006
13.4
1.91 142.5373
Mark Eidson <[EMAIL PROTECTED]> wrote: To back up my original estimate I used
Zilla View to capture the
realtime data from the controller. I then did a spread sheet analysis
to determine the wHr/mile. It confirmed my original estimate of 87
wHr/mile using the SOC measurement mentioned on the website below.
There could be some scaling errors and the like, so this could be off
by 10% or so. This is a prupose built bike very minimal loading other
than the traction motor and air pump to pump up the air bag which is
used twice per charge. The contactors and LED lights are run off a
separate 7aH 12V battery and are not included in the calculations.
http://www.evalbum.com/preview.php?vid=1231
On 5/7/08, Garret Maki wrote:
> Mark,
> 88whr/mile just seems lower than everyone else. Do you actually have
> instrumentation in place to count watt hours out of your pack or are you
> guessing based on what you think the SOC is? I have built several bikes
> with a current shunt and have used the emeter/Link 10 and also the cycle
> analyst to measure/ calculate actual whr/m and at 45 mph with a lighter bike
> I'm well over 100 with an etek and 300# bike and on a more similar bike to
> what you mention, around 117 whr/m with a series wound motor 50 psi in the
> tires and ducking behind the windshield with a fresh brake rebuild and new
> grease in the bearings.
>
> If you are using is cheap state of charge meter which is just a volt meter
> and going by the printed specs on the capacity of your batteries you are
> really just taking a poke in the dark about what the energy usage is and I'm
> afraid you'll be giving other builders false hope about what their range
> will be. I just want to keep it real here, and I don't think a lead bike
> converted from a gas bike will do better than 100 whr/mile avg. in 45 mph
> stop and go riding. Call me pessimistic, but I'd be happy to be proven
> wrong.
>
> I highly recommend this for $150
> http://ebike.ca/drainbrain.shtml
>
> Garret, in Minneapolis now.
>
> Mark Eidson wrote:
> 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 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: listserv@electricmotorcycles.net
> > > 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.
>
>
>
>
> ________________________________
> Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it
> now.
>
>
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