essaunders wrote:how are we powering this?
simple is best, but we might be back to having to deal with a 120 to 240v capable powersupply - once we have all that, it's probably just back to the Open EVSE guts with some extra logic.
If we can do it on just the power in the pilot then a super simple analog would be OK. -- not to overthink this -we're just trying to keep a tesla-inside car from killing a 30A max J1772 extension by mistake, right?
Yep, that's the goal. I want a nice light, simple, and "cheap" J1772 extension cord, and it's sorta dumb to make it 80 amp capable when almost all the public charge stations are 30 amps.
But, since some EVSEs are indeed 70 or 80 amps, the 30 amp cord needs smart protection from a Tesla driver who can suck down 80 amps.
The power has to come from the 100-250 volt power going through the cable, since I have no idea how much "power" is actually in the pilot signal. So, for at least a millisecond, there will be a pilot signal over 30 amps until it can be changed to 30 amps or less.
We absolutely don't need all the stuff in the OpenEVSE; no relays, no GCFI, no diode check, no stuck relay logic, et al.