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Messages - jcorning

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1
General Discussion / Re: Welcome!
« on: July 07, 2010, 09:39:09 AM »
Howdy!

I'm Jim, I've been messing around with electric motorcycles since 2007, when I converted my wife's Ninja 250 into a research vehicle....turned obsession. I've put over 2000 miles on it as an electric (not many, considering the span of years, but it gives you a sense of how much time has gone into redesigning and rebuilding to get better speed and performance). In the process of learning how to go faster, I've burned up a lot of expensive stuff that wasn't ready for highway speeds and the resulting power requirements. Here are a couple of links with photos of the project:

http://www.prometheussolar.com/Motorcycle.aspx

and

http://green.autoblog.com/2008/09/29/altcar-2008-prometheus-solar-powered-electric-motorcycle/

I'm working on a new bike, designed as an electric from the ground up. I've tried to attach a teaser photo, but your system says it's out of room. This is a full sized bike, aimed at real motorcycle performance and a 75 mile minimum range on a charge. I've been able to ride it a little, but we're working through some expensive lessons about lithium polymer batteries.... More when it's running regularly. Here's a site with some preliminary photos:

http://www.novakineticsmotors.com/

Anyway, this looks like an interesting forum, I'm glad I found it.

2
Street / Re: Street Bikes, Own One?
« on: July 05, 2010, 10:14:42 PM »
I've had several near misses in 2500 miles of electric riding since 2007, but only had to push once! It's good exercise, I used to do it a lot with my 1967 Triumph Bonneville, too.

More seriously, if you monitor your battery state (I just use a voltmeter, but there are more sophisticated ways of doing it) and your odometer, you should not be caught by surprise. My first conversion has an on-board charger, so I can mooch an "opportunity" charge just about anywhere.

Another consideration of course is to build a conversion with enough battery capacity for the riding you want to do. My bikes will get around 10 miles per kilowatt-hour capacity in city riding, but a bit less (maybe 7) on the highway.

As to self-discharge, it depends on the battery types. Lead batteries self-discharge at a measurable rate, and in my experience the nickel-metal-hydride batteries self-discharge at an atrocious rate. The ThunderSky lithiums I've used have an almost insignificant self-discharge rate, and the lithium polymers I'm playing with now also seem to hold their charge very well over time.

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