Question: if you power the Arduino and all the relay net thru the main batteries, what will be once you cut the main power? I guess Arduino goes out as well, or I miss part of the circuitry?
If it does, how do you engage antisparks and power back on again? Will you cut the power before of the ESC but after the UBEC? That could solve but then your safety just chop the power off the ESC no matter for the remote (unilely the Pacificmeister lanyard…), and a coil fully loaded like your huge motor, left to discharge onto the poor ESC mosfets ain’t a that safe, at all.
Second: 3 relays are something to deal with. I do know a bit of solenoids and those big Albright coils, they’re somewhat demanding, and thery’re coils, you need to protect your Arduino from those. Doable, no big deal, but does it drive your project toward complicated, does it?
Surely I’ll be wrong but in my idea, the Efoil main power needs a switch, to hisolate battery from everything, which is usefull on “everyday” basis an then eventually act as a “last safety before disaster”, eg. if your ESC blows… instead, to avoid potentially destructive switch off, riding safety should acts on motor power, read “ESC”, cutting the signal to have the motor come to a stop with no stress for other components. Arduino could help a lot in this too, that’s why lately I annoy @g.gregory8 on daily basis with my lousy codes.
I don’t know @MaxMaker, I would give a second thought to that relays switch…