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> (10 million watts of electricity)

10 million watt-hours of electricity

Your system would produce 10 million watts if it did 10 million watt-hours per hour.

Yeah, I don’t know the right way to write it. When I look at the app the reports our solar panel output and say I just want the output for all of 2020, it reports a figure just shy of 10 MWh. The previous years were close to the same figure. How do you say what the total output from a system was over an entire year?

10 megawatt hours is fine. 10 megawatts is incorrect. It's a mistake of units. A MWh is an energy measure while a MW is a power measure. That's what the parent was correcting.

You can say 36,000 Megajoules if you prefer :-)

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