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Dirt Bike Brands - Other
Battery Pack/power Supply
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[QUOTE="JasonJ, post: 155099, member: 23758"] Think of a power source as a battary, your car batt is good for say 400 CCA or cold cranking amps, the reason the batt needs to have such high capicity is becasue of the starter. When your not useing the starter, the extra current is not pulled form the batts, It is not needed so it dose not go anywhere. Max current for the most part is only generated when it is used. This is more or less the way your house power is, there is plenty of potential but it can only flow if there is load demainding it. But!,,, enter the world of permenant magnet motor cycles "generators" ,,,, Oh noOooooooooo! Now out put is dependent on RPM. Thast ok, becasue again, that max output figure in Watts is dependant on current or the load that is being demanded, the only problem is that the rectifier regulator sees that max Voltage potential at high RPM (like 100V measured on a street bike) and still needs to do its job and limit the voltage out when the input voltage is well over what is needed. Those high voltage, reletivly high current output components are why your rectifier / regulater boxes are about the same price as car alternators! But also the whole rig is much lighter since you dont need wire wound armetures, just a spinning magnet and a wire wound stator! Ahhhhhhhhhh. In cars, they use a power induced field in the alternator, no field, no out put. They regultate the field voltage to keep the out put volge low. This is why you can not push start a car (if its stick) with no, or a stone cold dead batt (EFIs excluded too :) ). You need about 5 Volts to power the field magnet or there will be no out put and no spark :( . Over charging the batt is a problem, a simple voltage regulater dose not care if the battery on the back side of it is fully charged or not, It needs some sort of feed back to sense the full charge voltage of the battery, or that voltage must be equal to the max voltage of the regulator. That is a more complicated circuit. Thats why delicate Li Ion Laptop bat packs are "smart" they have thermel and current sensors and chips to regulate the charge and discharge cycles an protect form overload or over charging. Lead acid batts dont care too much but can be over charged, but mostly by applying too much voltage. As was said earlier by our EE I belive, once the voltage of the batt matches the max output of the regulater, you will notice little current exchange between the two. So its important that the regulater be set to the correct max voltage range to keep from "cooking" the batt. I hope that helps, I hope it is more or less accurate, Im rusty on the Ohms law and all :) . And maybe the EE can clarify and correct if nessesarry. Hey,,, no bad spelling comments!!! I already know thank you :) . [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Battery Pack/power Supply
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