You said this was a black box experiment.
Energy in vs. Energy out. Measured with a voltmeter.
Was the compressed Hydrogen measured as well ? Was it accounted for in the ‘input’ ?
No, the compressed Hydrogen was not measured. You wouldn’t measure the specific chemical composition of gasoline in the tank of a car. You just measure its capability, 50mpg, 100mpg, etc. Then you measure that against another car, and another, etc. That’s black box testing. Such ‘input’ does not need to be accounted for, because they all use the best fuel available at the time, in this case gasoline. In the case you are inquiring about, it would be compressed hydrogen.