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duivendyk
Guest
No not necesarily,the problem is really to find a generator which will put out the right voltage¤t (power) to charge this battery with,in the 4-6 k rpm range preferably.Car alternators are an overkill, they can supply the 36V (with suitable modifications) and can run at these speeds, but can put out about 30/50 Amps easy their main drawback is that they are bulky&heavy look at one on your car,but they may be the only game in town.The other possiblity is to use a dc electric bike motor (not a hub motor of course).They can be used as a dc generator but the only way you can control the output voltage is by speed control of the IC engine which likes to be in the 4-6k rpm range (output is proportional to engine speed).Of course you can resort to pulleys&belts to match speeds,that gets mechanically messy,but we may have to.Locating one behind the other with a belt drive in between on the back rack is the best place.Fuel efficiency is not really a major consideration,engines are usually most efficient&durable at 3/4 load,running them at full power continuouslyis not a good idea generally, esp the low quality Chinese ones which I would definitely NOT mess with unless you want to tinker away forever.The best bets would be the Subaru Robin engines.Go to www.staton-inc.com look under engines, the Subaru EH 025 or EH035 are well engineered and easy to start.Honda's are OK too.You did not answer me question about battery life,do you commute,or use your bike just for riding around?
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