Originally Posted By: acharnley
The signal was read using a digital oscilloscope to ensure the amp wasn't overloading and distorting the signal.

Check voltage and current, at the same time if possible. Class AB and D give similar results if the output lowpass filter on the class D matches the system well. I can't really comment on that for your system.

Originally Posted By: acharnley
I hope your man isn't using the built in li-ions to skew the output results as the German translation is not clear. This would be very unfair.

That's why you test over longer times and cycle the batteries completely...

It is possible to display the current power flow (batteries, consumer, generator) with a smartphone app to check for obvious test design problems.