I am trying to evaluate solar (PV) potential for various areas in the world with use of daily data. The NASA POWER tool (https://power.larc.nasa.gov/data-access-viewer/) which I consider using, has daily data of All Sky Insolation Incident on a Horizontal Surface . This data has limited usability for tilted panels (as I understand) as it is composed of direct radiation (which depends strongly on the tilt angle) and diffuse radiation.
How can this kind modelling achieved with daily data?