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Old 03-07-2008
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Wow,
"The charge controller uses a tiny bit of the solar panel's output to transform the output to the batteries—on a good MPPT charge controller, this is less than 1% of the power going from the panels to the batteries. "

If this is true it is very effective.
From my old school days I remember that AC to AC conversion (with a simple transformer) is perhaps 95% to 98% effective (depending a lot on frequency, and ho knows what else).
I was also told that AC to AC is much more difficult to transform as you first have to do DC to AC conversion, then transform the voltage and then covert back to DC.
But of course that was analog technology.
If they can really do it now at 99% efficiency it is a great progress.
I will have to read about this.
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