Power generation error

I am using SAM's Residential Owner model to estimate power generation. I used the same equipment conditions and TMY data. Upon comparing the estimated power generation with the actual generation data I have for one year, I found that the results are different. Of course, I understand that there will be errors because I used TMY and the equipment conditions do not perfectly match. However, I want to obtain power generation data that is as similar (almost identical) as possible. So, I am wondering if there's a way to input one year's worth of generation data and have it extracted as is.