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EVSE Safety

Posted: Fri Oct 15, 2010 5:30 pm
by SecondTime
Does someone know if the EVSE will stop delivering power to the Leaf if the power inverter on the Leaf goes bad?

Had a problem with the EV1
See: http://www.ka9q.net/ev/ev1fire.html
and just want to make sure it won't happen again. Thanks.

Re: EVSE Safety

Posted: Fri Oct 15, 2010 5:40 pm
by evnow
I guess.

ANyway, welcome to the forum. Nice handle ...

Re: EVSE Safety

Posted: Fri Oct 15, 2010 5:48 pm
by smkettner
I might be wrong but the charger and inverter are probably separate items that work independently

Re: EVSE Safety

Posted: Fri Oct 15, 2010 10:24 pm
by johnr
smkettner wrote:I might be wrong but the charger and inverter are probably separate items that work independently
Yes that is as I understand it as well. Maybe the OP meant to ask if the EVSE shuts off in the event the on-board charger goes bad? And my guess is that it probably would.

Re: EVSE Safety

Posted: Sat Oct 16, 2010 5:03 pm
by tps
I don't think the purpose of the EVSE is to prevent problems if the EV or on-board charger malfunctions. At the other end of the spectrum, however are those who don't understand why a traditional NEMA dryer or range outlet is not a suitable standard for EV recharging.

What does an EVSE do?

1. It automatically enforces the recommended practice of de-energizing the power before the current carrying contacts break. With NEMA type RV outlets this must be done manually.
2. It contains a GFCI circuit to shut off power if unsafe ground leakage occurs. Most dryer and range outlets don't have GFCI protection; it is starting to become more common on RV outlets.
3. It generates a pilot signal to automatically tell the EV charger how much current it can draw without tripping the breaker. This allows a flexible, universal connector which will work in many situations, If the car used a NEMA plug, there would be no automatic way to adjust the charge rate to the circuit capacity.
4. It prevents the EV from back-feeding into the power panel. Eventually, this will change when V2G becomes a reality, but until those safety standards are set, the EVSE is a gatekeeper which prevents it.