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Opamp for a 75Mv 500 Amp shunt resistor circuit (Arduino)?

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Opamp for a 75Mv 500 Amp shunt resistor circuit (Arduino)?

Postby Mustang65 » Tue Apr 07, 2015 5:53 pm

Hello,
After searching around I was unable to find anything on an op amp that I need for a monitor circuit.
Background: I have an RV that I just added SOLAR to and I totally rewired the batteries/solar control center. Currently I am only going to monitor the 12VDC side of the RV, 110VAC will come later. I have 3 shunt resisters that I installed. A 500 amp (75mV) for monitoring the entire RV electrical usage. A 30 amp (50mV) shunt for the normal 12VDC items in the RV. A 30 amp (50mV) shunt to monitor the amps from the RV alternator charging the house batteries.

Being that the main shunt is 0 to 75mV, I will need to increase that voltage for the Arduino to monitor it and the same goes for the othe 2 shunts that are 0 to 50mV. So this is where my question comes in, does anyone know of an op amp that I could use to increase the shunt voltage? The output of the opamp should max out at 5VDC.

Thanks in advance for any assistance,

Don
Mustang65
 
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Joined: Tue Apr 07, 2015 5:12 pm

Re: Opamp for a 75Mv 500 Amp shunt resistor circuit (Arduino

Postby pebe » Fri Apr 10, 2015 6:24 am

You need an op-amp like an AD820, which has rail to rail operation for inputs and output.
pebe
 
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Location: Ellon, Scotland

Re: Opamp for a 75Mv 500 Amp shunt resistor circuit (Arduino

Postby Mustang65 » Sat Apr 11, 2015 11:28 am

Thank you pebe, I appreciate the response
Don
Mustang65
 
Posts: 2
Joined: Tue Apr 07, 2015 5:12 pm


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