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You could use a keylogger to keep track. Maybe track over the course of a week or two and then find the average.

Maybe a way of taking in and using or storing natural body heat while the user uses the keyboard. Not sure how practical this is, but I'm sure there could be a way. Possibly using the keys or a wrist rest to take in the heat and convert it.

If by self charging you mean wireless charging, then yes it is a possibility. Much like the wireless charging pad Samsung has come up with.