I would like to include the Internal rate of Return, that is, to include Tarif Analysis.  

Please note that HOMER does report the IRR and additional economic comparison metrics such as NPV, ROI, and payback.  To do an economic comparison of two systems, double-click on one system to get the Simulation Results window, go to the Cost Summary tab, and click Compare.  You have to choose another system as the base case, and then HOMER will calculate the economic metrics to compare the two systems.