> For peak power tracking of a solar battery charger, you only need to
> measure the output current.
>
> This is because (since the output voltage is fixed by the battery)
> more current == more power.

No, it's because charging a battery is inherently a current operation.
The flow of the current resets the chemicals from discharged to the
charged state.  Therefore the total charging charge (coulombs, mAH, or
whatever) is more relevant than the total charging energy.


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