[Noisebridge-discuss] Bike generator or alternator?

Joseph Brenner doomvox at gmail.com
Fri Aug 29 00:08:42 UTC 2014


"Still not clear on cause of alternator being more efficient when half it's
cycle is blocked by diode(s). "

I was envisioning "full wave rectification":

  https://en.wikipedia.org/wiki/Rectifier

Where the sine wave then gets turned into a series of connected mcdonalds
arches.





On Thu, Aug 28, 2014 at 2:33 PM, Robert Benson <sf99er at gmail.com> wrote:

> Thx for the info & link. Looks like the NC25A Charge Controller may be
> better than a voltage regulator if you dump excess to aux battery. Still
> not clear on cause of alternator being more efficient when half it's cycle
> is blocked by diode(s). Anyway, I think I'll get an alternator instead of
> the generator I was planning to get. Thx again. Cheers
>
>
> On Thu, Aug 28, 2014 at 1:53 PM, Joseph Brenner <doomvox at gmail.com> wrote:
>
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>>
>> Typically, a "generator" implies it's DC output, and an "alternator"
>> implies the output is AC.
>> To charge a battery, you need to "rectify" the output from an
>> alternator to fake DC, but
>> that's more efficient because you get to use the full cycle.
>>
>> There's a bunch of other issues... you probably want a "deep discharge
>> marine/rv" battery--
>> and the last time I messed with this kind of thing, there was no good
>> substitute for Sears Die Hards--
>> and you'll want some sort of voltage regulator to keep from
>> overcharging...
>>
>> There's a bunch of web pages like this around that talk about this stuff:
>>
>>
>> http://www.doityourself.com/stry/how-to-charge-a-12v-battery-with-an-exercise-bicycle
>>
>> On Thu, Aug 28, 2014 at 10:20 AM, Robert Benson <sf99er at gmail.com> wrote:
>> > I'm building a 12v bike generator out of a stationary bike exercise
>> stand.
>> > Does anyone (jake) know if a car generator or alternator is better or
>> what
>> > the differences are in output? thx
>> >
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>>
>>
>
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