[Stoves] Hand Crank Dynamo for Fanned Stove?

[Crispin Pemberton-Pigott]

Dear Paul

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

Agreed.

>...Cell phones at least are priming the world for small appliance and
battery charging. Internal thermoelectric power is one approach to less
parts, if a lifetime can be predicted when used in the field.

But these guys are clever.  I found a battery with circuitry in it that
polls the phone it is in to see if the phone is genuine or a knock-off and
won't deliver power if it is not genuine.  The real phones will also not
work if the battery is a knock-off!  The circuitry is the thermal protection
circuit with a few bits added.  Never assume anything...

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?

Regards
Crispin