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Converting automotive alternator to put out 48V?

2865 Views 3 Replies 4 Participants Last post by  steddy
I figured that maybe some of the regulars in the generator forum could advise on this. Apparently (if you're an electronics whiz) it's fairly easy to get an automotive alternator to put out as much as 120VDC by modifying the voltage regulator. This could be very useful for charging large banks (48V, etc...) of batteries via an alternator coupled to a small engine. Has anyone seen a good FAQ out there of how to do this? I just don't know enough about resistors, diodes, make sense of it all without pictures or very detailed step by step instructions.
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You could just wait a few more years--I read awhile back that they are planning to change new vehicles to a higher voltage system,and I think 48 volts was the target..

One prototype I saw in a magazine however,showed the alternator and starter being a combined unit,made around the flywheel,much like the charging system on many small engines..(can you say "nightmare to service" ? :eek:)..

I would say it would be easier to boost a 24V alternator from a semi truck up to 48 volts,than a 12V car or truck one..or get more amps at least--its is possible to get up to 120+ volts from a 12V alternator,but at the penalty of losing amperage..but I've seen car ones used to weld with 1/8" rods,so they must be able to put out a healthy amount..

If you google "Alternator Secrets" you should be able to find a reprint from a Lindsay publications book that explains how to get more voltage from car alternaters..
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