[Stoves] Hand Crank Dynamo for Fanned Stove?

[Paul S. Anderson]

Thank you to everyone who responded.

Charlie wrote:
>> ...my gut feel is that all the LEDs in the latern take very little power,
> compared to 4 watts.

Crispin wrote:>
> Paul: consider for a minute a hand pump.  The power one can deliver (from
> the pump, not the input) is about 40 watts.
>
> Assume a 40% conversion of that output to electrical energy (somehow).
>
> For a 'crank' on a handle of 1 minute you get 60 x 40 x 0.4 = 960 watt
> seconds.
>
> Running a fan using 0.5 amps and 1.5 volts (not your 12 volt one) you will
> get roughly 1300 seconds or 20 minutes of fan power.
>
> Is that good enough?  Twenty to one?

That is good enough for the LED lights, but would be only about 2.2 minutes of
my 12 volt blower power from one minute of cranking.  NOT so good.

So, that aspect is considered close unless I can get the same blower 
power from
a 6 volt unit or lower voltage.  Not likely, I feel.

About the inner tube of air.  I tried that during my first 6 months 
with stoves
(back in 2001) and it was completely unsatisfactory.  The Volume of air is
finished way too fast to justify the pumping into the innertube.

0.3 amps x 12 volts = 4 watts at full power.  So if the PWM can 
regulate it to 6
volts, that is only 2 watts, which is only double what the fan uses in the
Woodgas campstove.  My stove requires a blower.  The campstove blow air
straight upward (and easier task, but I do not want the fan/blower to be
directly under the fuel container).

So, now my task is to get better blower output from the 4 watts or less.  That
will be a new topic in the near future.

Thanks again,

Paul




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