Mostly, when diodes blow, it is an open-circuit, not a short-circuit (***).
(***) Correction from Ingineer:
He says that Diodes usually fail by shorting (closed circuit) rather than open-circuit as I suggested might be the case. I did not know that. Perhaps signal, power, and Zener diodes are different? Recently, some of my Zener Diodes have failed (overheated), going open-circuit with no increase in current.
An open-circuit at the diode might just make the car not charge at all, since the EVSE might not detect the car being plugged in at all.
Hard to say for sure what would happen with any particular car-EVSE pair. But, likely no charging.
A closed-circuit failure would give the "charge OK by some EVSEs, but not charge by other ECSEs" symptom.
The EVSEs that do not check for the diode (AV, Nissan L1, etc.) would work, but those EVSEs that DO check for the diode (as they should) will (normally) refuse to charge.
Last edited by garygid
on Wed Jan 11, 2012 10:30 pm, edited 1 time in total.
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