[Noisebridge-discuss] Bike generator or alternator?

hol at gaskill.com hol at gaskill.com
Thu Aug 28 22:04:21 UTC 2014


definitely want a charge controller designed for the type of battery
you'll be charging since each type has its own charge sequence that
prevents it from overheating or other nasty failure modes. if you're
running voltage-sensitive 12v loads from a 12v battery (typically up to
14.8 volts when fully charged) you'll want a voltage regulator like
LM7812 between the battery and your load, otherwise most devices that
run on 12V can run happily slightly above or below. good luck! 

On 2014-08-28 14:33, Robert Benson 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:
>> [1] Joseph Brenner (doomvox at gmail.com) is not on your Guest List [2] | Approve sender [3] | Approve domain [4] 
>> 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 [5]
>> 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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