Hi, Circuit is intended to measure a high voltage battery voltage and input it to an ADC to monitor the voltage.

Hoping someone can confirm that I am viewing this circuit appropriately, assuming ideal op amp rules apply. Trying to come up with an equation to relate the Input Voltage to the output voltage.
Actual Circuit

Circuit w/ Op Amp Converted to Ideal Components.


I'm thiking I need to solve a system of equations, just not sure how messy that is going to get?

 

Delete Rb and Rd, then it's just Rc/Ra.
Is the battery voltage fully floating? If so, the common-mode voltage range of the op-amp may be a problem.

 

Yes, the battery is floating. I'm inheritting this circuit so I don't have the luxury of making changes for now.

 

You ideal component circuit does not seem to be correct, as you no longer have the op amp in the feedback loop.

 

My intention of having the "Vout" voltage source is to represent what the output voltage needs to be across the feedback resistor to drive the"Input Terminal Nodes" to the same voltage.