major wrote:

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Sorry, the meters are a GE2524 Digital Multimeter that reads the 9V and
the other meter is a Etek 10709 that reads 4 V.

Not sure about dimmer frequency, but I can hear a faint whine as it runs.


** What range are you using ???

AC volts or DC volts?

PWM voltage waves can be read as an average value on any DC meter - but true power will require something much fancier.

Why not just measure the DC battery current and multiply by the voltage?

Then subtract a watt or so for losses in the controller.


..... Phil