Use a transformer (must be good quality for good accuracy) and resistive divider for voltage sense and a Hall effect current sensor for current sensing. Put the two into the two channels of a sound card and use software to do it.
Or use something like a cheap FM transmitter and receiver (both must be stereo) so a simple resistive divider and a shunt can be used as the wireless link provides the isolation.
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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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