I tested a few PC PSUs and they seem to use about 15W enabled but not running anything. They seemed to vary from unmeasurable to 3W when plugged in but not enabled. The "green" units use about 5W enabled and unmeasurable when not.
If it's an old/junk unit that requires a dummy load to keep regulation, add a few watts.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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