Flux Capacitor Back to The Future with Sparckmoto

Texasstar

Texasstar

Can't is a four letter dirty word
Ok there is a mad scientist in the group and his name is Sonreir. (Some of us would like to know the etymology behind such a handle but it probably involves a secret handshake) so are you tired of buying batteries? Watch this then call Sonreir http://youtu.be/EnozOrPnTgc
 
so thats the ever wise sonreir... haha now onto the questions, no battery huh? how do you charge the capacitor? are you running only the essentials of that thing or what? headlight, turn signals, etc?
 
We are running only the essentials
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snmavridis said:
so thats the ever wise sonreir... haha now onto the questions, no battery huh? how do you charge the capacitor? are you running only the essentials of that thing or what? headlight, turn signals, etc?
Click to expand...

The capacitor charges from the alternator, just like the battery would. Unlike a battery it doesn't hold a charge very long, however. If the bike is running, it will discharge almost immediately.

Sometimes you can even run a bike without a capacitor, but it's not advised. In the case of the earlier Honda twins, they use a single phase alternator to provide power. Single phase AC current looks like the top graph attached in the pic below. After passing through the rectifier it becomes DC current, which is what you see in the bottom graph. The point I'm trying to get to is that electricity generation on your bike isn't a steady flow of electrons. It comes in pulses and so something (usually the battery) helps to fill in the valleys and smooth out the peaks. The capacitor provides this same service, but acts as a much smaller, lighter, and more temporary storage medium.

Not all bikes can run with a capacitor and they're not usually a good option for the street. High current devices like headlights and horns don't generally play well with capacitors because the electricity required by these components can often be more than your alternator can supply at idle speeds (and again, the battery seamlessly fills in these gaps on a stock bike).

More info here: http://www.dotheton.com/forum/index.php?topic=44556.msg553906#msg553906
 

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I believe he had to settle for some ill-tempered sea bass due to OSHA requirements.

Haha, I was going to say, he is a little less Doc Brown, and a little more Dr. Evil.


The capacitor is interesting. How long does it hold it's charge, or is that a function of capacity? I mean, if you had a big enough one, could it be adequately supply a street bike? Perhaps if the charging system was capable of supplying enough power at idle?

I was thinking of Toyota's hybrid Yaris that uses super-capacitors, but I imagine its ICE is capable of supplying all of the system electrical needs.
http://www.autoblog.com/2013/08/30/toyota-drops-detail-414-hp-hybrid-r-concept-powertrain/
 
Flugtechnik said:
I believe he had to settle for some ill-tempered sea bass due to OSHA requirements.

Haha, I was going to say, he is a little less Doc Brown, and a little more Dr. Evil.


The capacitor is interesting. How long does it hold it's charge, or is that a function of capacity? I mean, if you had a big enough one, could it be adequately supply a street bike? Perhaps if the charging system was capable of supplying enough power at idle?

I was thinking of Toyota's hybrid Yaris that uses super-capacitors, but I imagine it's ICE is capable of supplying all of the system electrical needs.
Click to expand...
ours bled down over night.


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Texasstar said:
Matt is that 20k microfarods
Click to expand...

22,000µF, if I remember correctly.

Flugtechnik said:
The capacitor is interesting. How long does it hold it's charge, or is that a function of capacity? I mean, if you had a big enough one, could it be adequately supply a street bike? Perhaps if the charging system was capable of supplying enough power at idle?
Click to expand...

It's a function of both capacity and drain. You can think of it kinda of like a mini-battery. Bigger capacitor takes longer to charge and longer to discharge. Having an alternator capable of supplying enough power to run your bike at idle speeds is almost a prerequisite though. There are a few tweaks and modifications you can make to increase your chances of success, but when it comes to caps, some bikes are easier than others.
 
Sonreir said:
22,000µF, if I remember correctly.

It's a function of both capacity and drain. You can think of it kinda of like a mini-battery. Bigger capacitor takes longer to charge and longer to discharge. Having an alternator capable of supplying enough power to run your bike at idle speeds is almost a prerequisite though. There are a few tweaks and modifications you can make to increase your chances of success, but when it comes to caps, some bikes are easier than others.
Click to expand...
like Buying a Sparckmoto rectifier regulator


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