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In fact, there is: With a voltage-to-frequency converter. Those chips simply convert a voltage (like 0...10V) to a square wave TTL signal (like 0...10khz) and you put that through an optocoupler and hey presto, there's your isolated measurement. Same thing with isolating the current from a shunt. Measure the shunt voltage (0...100mV) and that way you can isolate DC current. I'm planning on making a small module with a shunt, a voltage divider, 2 v2f converters and an optocoupler to include in the battery package. That way I can add a µC-controller voltage/current dispplay in the cockpit without worrying about long wires or isolation.
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