BeCAUSE I Know what I’m talking about, and the "experts" who gave the recoming and designed the class tests do not knowing any are talking about.
FIRST of All, His Demo Showed that Interrupting Full Voltage from PV Panels (Feeding A Short) who wired backward a failure. True.
PROBLEM is, we use fuses or breakrs to prevent backfeeding into a string due to a fault, when paralleled Photovoltait Breaker with Other Strings.
Consider 9 Strings of PV Panels Each on A Sepalate Breaker, Paralleled, and Connected to Another Breaker Which Was Supple
The 9 breakers all do not tripted becaue each string only puts out about 7a, and breaker is 15a.
The One Breaker Carries 9 x 7 = 63A, Backfeeding Into a Short so it trips. It is now carrying in the wrong direction, so it burns up.
t interrupt itsurrent, only server as an actionor for the other.
Alternative Mentioned in the Video, Non-Polarized DC Breakers, Can Be used Photovoltaic Dc Circuit Breaker Individually.