Tecnam P2012 Captain reported the aircraft had complete electrical failure during cruise flight. Flight diverted and landed safely.

Narrative

On Day 0 we departed out of ZZZ at XA15 local time and climbed up to an altitude of 9000 feet towards ZZZ1. At XB:13 as I was switching the Multi-function Flight Display (MFD) from the Map page that shows our course path; to the Full EIS (Engine Indication System) page; I noticed that our Right Battery; Main Bus Volts; and Essential Bus Volts were dipping into about 22 Volts (the red). I realized something was amiss when my FO told me the RH Alt circuit breaker had tripped. I looked back at the screen to see if we could make it to (ZZZ2); one of our bases; roughly 50 miles away at the time. As I was about to inform Operations Control and ATC of our intentions; we loss all Primary Flight Displays (PFDs); MFD; and Radios. Prior there were no Crew Alert System (CAS) messages such as BAT Failure or Alternator Failure. There was a complete electrical loss. All we had left were our standbys and magnetic compass. Concerned we lost our position and had limited time to land I directed my FO to get the proper course off Garmin and call ATC for assistance to [request priority handling]. As we worked to make contact I turned off unnecessary items such as the environmental controls; lights; and turned on the emergency battery where our power returned. We were able to successfully talk to ATC and land at ZZZ3. I taxied to the FBO and parked; then turned off the emergency battery switch and immediately all power was lost. The flight only lasted about 1 hour.Cause: I think a voltage regulator may have failed causing the RH Alternator circuit breaker to trip. The Battery then was drained as it was unable to support the load.Suggestions: I think we need to monitor our components of the electrical system in terms of how long an alternator has been with the plane such as is it the original? or a replacement with a lot of time? I think the endurance of our flights with fluctuating temperature changes strains the components life spans.