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