How about use hall effect sensors to sense the current? Then you don't need to integrate the signal and therefore get a higher accuracy. (The magnetic field around a wire is proportional to the current through the wire, but the voltage across a coil in a changing magnetic field is the derivative of the magnitude of the magnetic field with respect to time, so it would be necessary to integrate the voltage with respect to time to get the correct current for anything other than a sine wave. But the voltage output from a hall effect sensor is proportional to the magnetic field, so no integration is necessary.)
As for other improvements, maybe add an OpenWRT router to allow network access?
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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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