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Sensing DC current- HELP

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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.

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