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why must the ground be isolated ? are you sure about this ?
Back up. What are you trying to do? What's your goal? You're trying to measure the battery with a device powered by that same battery. Why?
You can't just connect the shunt on the other side of the load so the grounds are common?
Can you provide a link to the datasheet of that panel meter?
It's this meter http://www.adafruit.com/products/574. I don't know why I decided to wire it on the high side.. Probably why I posted it in 'Beginners'
Another option is to have one circuit power the meter while it is sensing the same circuit. To do this, you'll need to make sure that you are low-side sensing. This is because the ground power wire is connected to the black current sense wire.
Relay
Did you actually read the Adafruit page?
Quote from: WarSim on October 07, 2013, 04:35:48 pmRelay