[Stoves] Hand Crank Dynamo for Fanned Stove?

[Robert Penn Taylor]

Niels,

Which part should Charlie reconsider? Looks to me as though he 
calculated the power requirement correctly, but perhaps I'm missing 
something.

-Penn

Niels Petersen wrote:
> The fingers are not working well this morning. I really should check my
> typing before pressing the send button :-(   300 milliamps = 0.3 amp
> 
> On 12/5/07, Niels Petersen <nielspt at gmail.com> wrote:
>>
>> Milliamps !   milli = 1000 Therefore 300 milliamps = 0.3 amp
>>
>> Maybe you should reconsider your following statements
>>
>> --
>> Kind Regards
>> Niels Petersen
>>
>>
>> On 12/5/07, Charlie Sellers <csellers42 at yahoo.com> wrote:
>>> Paul,
>>>
>>> If you really are pulling the full 300 milliamps (.3 amps) at 12 V then
>>> that amount of "power" is just the product of these two, or about 4
>>> watts.  For comparison a single ordinary LED will need MUCH less than one
>>> watt and the WoodGas stove fan needs a little more than 1 watt.  So your 4
>>> watt need is quite a bit of power.  Are you sure that your PWM duty cycle is
>>> 100%, and not less than that?  As you turn it up from no power to full power
>>> the duty cycle (or percentage of time that the PWM turns the power on) goes
>>> from 0% to 100%, increasing the fan speed proportionately.  An ordinary
>>> multimeter will not tell you duty cycle, so you can't use it to determine
>>> the power you are consuming.