Pablo wrote:
so every one of them has an AC to DC inverter which wastes power by turning it into heat-- while converting only a percentage of it to DC so the computer/fax/tv/whatever can run.
Sorry man, hate to nit pick, but I gotta make a correction.
AC to DC is done by a rectifier.
DC to AC is done by an inverter.
Rectifiers run very cool and are very efficient. In fact, DC is very efficient in
most circuits. AC is used in households because it is more efficient to
generate and send over powerlines across great distances. But, when put
to use in an electric motor (or other high load device) AC current can
create a lot of heat.
Inverting DC to AC is not very efficient and creates heat. However, most
applications that require an inverter are mobile or off-grid and efficiency is
not a huge factor.
Where all your DC appliances (TV, cable box, computer) create a lot of
heat is not through the conversion of AC to DC but through amplifying the
DC current to support the load.
Remember, all your household items are built very cheaply. Efficiency for
the end user is of no concern. They could be made to produce less heat
but lets face it, no one wants to pay for it.
Think AMD vs. Intel.
An Intel CPU absolutly needs a big cooling fan to keep it cool whether
under heavy load or not. An AMD CPU can take the heat and only needs
the fan when under heavy loading, and you will find that AMD processors
are typically more expensive than Intel. My AMD has the ability to vary
the fan speed as needed.
Anyway, I could go on and on. I will stop here before I hijack this thread.