[Gta04-owner] How could GTA04 shine

[Bob Ham]

On 08/03/2012 23:29, thomasg wrote:
> On Thu, Mar 8, 2012 at 23:42, Bob Ham <rah at bash.sh> wrote:

> > There is a panel here
> >
> > http://uk.farnell.com/bp-solar/msx-005f/solar-panel-0-5w/dp/654000

> this panel generates a very low voltage.
> The nominal voltage under testing condition (which includes cooling
> the panel down to 298K ) is only 3V. In mediate climates under full
> sun, you easily get 320K or even more panel temperature, in this case
> the voltage will drop rapidly and I don't believe that you can
> actually charge a LiIon battery with under 2V.

The panel has a "Temperature Coefficient of Voltage per °C" of -16mV.
That means the voltage at 320K would be 2.948V.  Assuming this
coefficient is constant, in order for the voltage to go down to 2V, it
would in fact need a temperature of 379K.  However, if the sun managed
to heat a panel in the back of the phone to 106°C, I imagine the charge
voltage would be the least of my concerns :-)

-- 
Bob Ham <rah at bash.sh>

for (;;) { ++pancakes; }

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