My ELSA 12 now has 28 hours on it, and it is a great flying aircraft! Unfortunately, I had to replace a failed voltage regulator/rectifier about 2 hours ago. The new voltage regulator has worked well for the last two hours, producing 13.6 to 13.8 volts at cruise. Today, however, after a 30 minute flight, with flawless electrical readings, to a neighboring airport another electrical twist took place, leaving me stranded without any power whatsoever. After landing, I discovered that I could not transmit, and a low voltage warning flashed on the screen. I increased the RPM's for taxi and I was then able to transmit and the warning went away. I shut down and tied down to have lunch. After a short while, I tried to start up, but the Dynon would not power up. I noticed that the panel cooling fans were not powered, nor was did the entire panel receive power, including the electric fuel pump, trim and all other electrically powered systems. I received a click from one of the solenoids only, but no other power indications, just a totally powerless panel. Checked the battery and connections first. Battery was a bit low, 12.0, but understandably so since I had entered turned on the master a couple days ago to upload GPS data to the Dynon and we had just had a short flight, not enough time to fully recharge. We checked wiring, all okay at first check. We jumped across the starter poles and the engine turned over as it should. So, I seem to be stumped. Could this be another bad voltage regulator contributing to the failure of either the master switch or, perhaps more likely a failure of one of the solenoids? Does anyone have any wisdom with this issue that has left my aircraft stranded overnight tonight? Many, many thanks for any help from those who have experience with electrical systems!! I like to attack this tomorrow morning.