Jherche

Hi, I'm modeling quite a large project where there are 18x SolarEdge SE100KUS inverters, all using C651U optimizers. I've modeled a total of 54 total units (33.33 kW each). The Global system summary accurately calculates 1800 kWac. However, after running the simulation, there is a very large discrepancy where total ac power comes out to 1699 kWac. How can this discrepancy be fixed? Thanks!