# Using ode15s to solve DAE system - how to specify which variable IC to change?

I am trying to solve a DAE system with 7 ODEs and 1 algebraic constraint equation, so a total of 8 variables.

I specify my initial conditions then ode15s calls daeic12 to find a better set of initial conditions consistent with the constraint equation. In doing so matlab changes 1 initial condition for a particular variable $$V$$ (in this model the voltage), however this messes up my results as it gives me $$V = 60,000$$ mV which is not correct. Ideally I would like to specify that ode15s changes the initial condition for a different variable that is more flexible but I'm having trouble figuring out how to do so. Does anyone know?

Thanks!