[MLB-WIRELESS] Solar power modelling

[Tony Langdon]

> > > From memory, Vak did this. They draw around 400mA I think.
> > 
> > At what voltage?
> > 
> > P = V x I
> > 
> 
> Sorry, at their default voltage: 5V.

Hmm, that's only 2W.  If you're going to use a 12V solar system, I'd
strongly recommend using a switchmode regulator to bring the voltage down.
That would probably save 50% power, compared to a linear regulator which
would dissipate (i.e. waste) at least 7/12's of the supplied power as heat.
A switchmode regulator should be 80-90% efficient.

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