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Submitted by reikiman on Mon, 03/31/2008 - 19:06
Recently I noticed some motorcycles w/ approx 100 lb battery packs are having the same range as I'm getting with the 220 lb pack on my Lectra. Namely 45 miles/hr and up to 10 miles range. Last weekend I showed the Lectra to a knowledgeable e-motorcycle builder and he thought I should be getting better range. So I'm wondering what's up with the range.
If I'm careful and don't hit the throttle real hard .. I can get 11-12 miles range. Hit the throttle hard, and the range is much less.
What I'm seeing on the ammeter is that cruising at 40 miles/hr consumes 100A current. This guy I talked with last week thought that was excessive, that the current should be much lower like 50A. And, I think y'all with the XM-2000 and other scooters are reporting approx 50A current for 40 miles/hr.
An interesting datum is the coast-down time as I reported earlier...
2004 Honda Rebel 250: 40->10 miles/hr takes approx 40 seconds
Lectra: 40->10 miles/hr takes approx 25-30 seconds
I also see this when I'm pushing the motorcycle around like when I'm backing out from being parked. It's a lot harder to push the Lectra around than the Rebel. So what this means is the Lectra has more rolling resistance. High rolling resistance should make the current draw higher to get the same speed.
Over the weekend I brought the bike into the garage and put it on the lift. This let me roll the wheels by hand. The rear wheel rolled pretty freely but the front wheel took a fair bit of effort. Hmm...
Just now I took it out for a spin to see if any part of the front wheel/axle/brake would get warm. The first time I stopped the front disc was pretty warm, but I'd been using it to stop quite a bit. I took it around the block a couple times, just using the rear brake for stopping. After that the disc was cool(er). Not sure what that proves.
I noticed the brake pad seems to be resting on the disc. But don't brake pads do that normally?
Another issue is the battery pack. I finally have the paktrakr running correctly. Until now I could only measure battery voltages after stopping and getting off and getting the meter out and measuring each battery individually. By the time I did that the batteries had time to recover their voltage, and I only ever saw the batteries having fairly even voltage. However I see now with the packtrakr the behavior while riding.
Battery #3 is much weaker than the others. Its voltage is dipping considerably during the ride and it runs out much earlier than the others.
This too is going to be affecting the range. Because the weak battery causes the other batteries to work harder.