Hello Oso,
You are saying that: > Most alternators are rated at 6000 rpm, so it should produce the full > 70 amps. You do need to subtract the excitation current from that, so > I would not count on anything above 65 amps. > > Spinning it at that speed, the brushes are not going to last very > long, 6-8 weeks would be my guess. If you cut the speed to about 3000 > rpm, the alternator should still produce 50-55 amps and the brushes > will last a little longer, say 12-16 weeks. I am wondering about this 12-16 weeks brushes life time. Some of us have cars which we mostly ride in the city, 90% of their life time, on which the normal motor speed is something from 1000-3000 rpm's. Usually there is something like 1.5 ratio between the alternator and motor shaft. Other people are mostly using their cars to run on highways, which means 2000-5000 rpm motor speed. In both cases the life time of a alternator (including brushes) is at least 5 years, even more. It is that kind of equipment that you only change once during a normal car lifetime. Am I wrong ? Am I right ? Radu ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
