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For quick calculations like these I've found that the GNU 'unit's command is actually very useful. Keep your prefixes straight and it will confirm your units as well:

https://plus.google.com/104092656004159577193/posts/CEq8xTH3...

You have: 117.075 peta watt hours / (325 days * 8 hours/day * 1 kilo watt/meter^2) You want: km^2 * 45028.846



GNU units is very nice, I used to use it a lot, but wolfram is easier because it's less picky about getting the spelling of each unit correct.

<ribbing>So if it's so great why did you get your calculations wrong? :)</ribbing>




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