alt.energy.homepower

On Sun, 02 Mar 2008 13:16:41 GMT, Gordon Richmond
wrote:

>>Per Martin Riddle:
>>>I use one of those flashing LED rear lamps.
>>>
>>>And a converted head lamp with a 6v Kryton bulb driven off 4 1200mAh AA's. Its 2hrs of light.
>>
>>There's not doubt whatsoever in my mind that the rational
>>solution is battery-powered lights. They're everywhere - and on
>>sale right now at Performance. Witness my own hand-held
>>flashlight (2 C batteries - probably be putting out light on the
>>original batts long after I'm dead...)
>>
>>But now I've got this Sturmey-Archer Dynohub (was planning on
>>just a drum brake... but the drum + generator was only five bucks
>>more...) so, just for grins, I'd like to make a system that works
>>without batteries.
>
>I think you could make it work. Even if the dynohub is grounded, you could use a bridge
>rectifier; just ensure that anything on the DC side is NOT grounded.
>
>I'd set it up as a six-volt system. That's what it's rated at. Running 3 volts
>lamps/batteries, there's too much likelihood of overcharging batteries or burning out
>lamps. You could run some pretty impressive LED lamps with 4 watts of power.
>
>Set it up with a plastic battery-holder and 4 AA cells. Try nicads or alkalines. The
>latter aren't supposed to be rechargeable, but likely a SMALL reverse current won't kill
>them. The bridge rectifier should keep the batteries from backfeeding the alternator coil.
>
>Sounds like a fun project. Good luck with it.
>
>Gordon Richmond
Never seen a grounded SA Dynohub. Not saying they don't exist, but
every one I've seen has been a 2 terminal isolated single phase AC.

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