How to factor in TOU rate plans when modeling a solar system?

I am in California where our utility company has us on a Time of Use (TOU) billing plan. During the day the we use the least amount of power and the power company will pay us $0.45 kWhr. In the evening and weekends when we are charged $0.12 kWhr is when we use the most electricity. This means for every Kwhr the power company purchase from us at $0.45 we can buy it back for $0.12. The software currently only models for yearly kwr offset and when it should be calculating the yearly financial offset of solar. With our power company paying over 3 times for kWhr what we buy have to buy it for we could get by with a solar system that would be one-third the size of the number of kWhr we need per year.

Is there a way to factor in TOU?

Paul thank you, this is perfect. By any chance is there a list of "experts" or people I can hire to do some modeling in SAM for me?