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Arduino - 500Amp Shunt resistor (75mV)

Question asked by Mustang65 on Jun 20, 2015
Latest reply on Jun 30, 2015 by rvieja

Hi Everyone,

I am looking for a little assistance with connecting a few shunts to my Arduino.  I have an RV and I currently added SOLAR and deep cycle batteries and added 2 Shunt resistors, a 500 Amp (75mV) and a 30 Amp (75mV).  I was looking for an op-amp that I can use between the Shunt resistors and the Arduino.  The 500 Amp Shunt is on the negative cable (see picture below) and will probably require a bi-directional, the 30Amp shunt is on the positive cable from the alternator circuit.  I looked at a bunch of possibilities (Ad8218, 8055, 7753, 8417...) and now I am thoroughly confused. 


RV voltage = 12VDC

Max voltage to Arduino = 5VDC

Max Amps should be around 300 (surge) amps from inverter.

Max Charging =  25 Amps


Your thoughts as to what amp would be best suited for this project.


Thanks in advance for any assistance