erc 3 Posted March 4, 2011 Share Posted March 4, 2011 anything that does this right @ 200 amps is going to be expensive. You cant even measure 200 amps of AC current for a couple bucks if you dont need accurate sensing what about something like this: put a 3in section of 6awg wire in the circuit. It will have a resistance of 0.000098775 ohms and dissipate 4 watts with 200 amps going through it. Your voltage drop across it will be .019something volts. Measure this potential difference with a max4172 current sense amplifier, with its output into an analog input on your mcu. With some calibration this setup could actually be pretty accurate. Quote Link to post Share on other sites
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