The only things that I’m plugging into the board are stepper motors, and the LCD display, so 19.5 VDC should not hurt anything. The MKS Gen L V1.0 board supports the range 12 VDC to 24 VDC.
(Unlike the mega+ramps combination, which supports at most 12 VDC unless you remove a diode on the RAMPs board. I found this out the hard way. Anyone want a mega that needs a new voltage regulator?)
So you’re saying for our purposes (MPCNC, moving steppers) that I need the 6 amps, that 4.62 amps @ 19.5 VDC won’t be enough. What are the symptoms when you don’t have enough amps?
I have no idea if the LCD will be okay, I would assume the 5V reg will be good enough. I have no experience with voltages over 12V into any boards.
No. 12V x 5A=60W is what I recommend for everything including a hot end. 12W would probably be more than enough for a system without a 40W hot end heater. 19.5V x 4.62A = 90W…more than enough.