onboard kilowatt-hour meters question

[BSherry]

I don't know what other folks do, but when I had kilowatt/hours in my instruments, I would sum (average) both current and voltage over a period of 1/4 second, multiply the result together to get watts, and sum those each 1/4 second. I would then divide that sum by a calibration factor, that included time, in order to get the number to display as W/H.

I admit it would be better to multiply each sample and sum, but the processor I was using then had no hardware multiply, so I had to compromise. My current units have a processor with multiply, but I haven't gotten around to writing the algorithm. I am always trying to do too many things all together, simultaneously, at once.

Bruce Sherry
Bruce Sherry Designs