Re: [EVDL] EValert: GE WattStation Damages Leaf EVs = can no longer charge from any E
It seems less likely to be a workmanship error (bad wiring) than a bad
When I was a Customer Engineer (CE) at hp (way-way back when), sometimes
despite all the quality checks, and rechecks, a
bad/weak/flaky-over-time/heat-cold-sensitive component would sneak/feed
into manufacturing. So, there would be a specific date-code of boards or
components that we CE's would quickly know about and would not accept
replacement boards from parts/stock that the CE's considered suspect.
But it took a hp hot-site task-force to determine what these failures
were, so we CE's could keep them out or swap them out of customer
computer systems/servers/main-frames. If I read those newswires
correctly, that is the point GE is at, having their GE task-force
determine what the cause is.
Since not 'all' GE WattStation EVSE are causing this failure, IMO
whenever the actual cause is found, it might be a certain run of these
units (a specific grouping or range of serial numbers that are suspect)
that can be recalled for corrective repair. I pray once those units are
corrected, those EVSE are relabeled stating that correction has been
done. Then Leaf EV drivers can look for that labeling to know if it is
safe to use it or not.
In the mean time, and I hope people will bear with my repeating myself,
until we find out 'what is what', *Leaf EVs should not plug into a GE
WattStation. Your Leaf's just too important to take the chance.
[quote] Cor van de Water wrote:
> Hi David,
> Since GE confirmed that they did something wrong,
> there must be a fault or incorrect implementation
> in the charging station that causes damage to the Leaf
> as a result - even if it is that it does not allow the
> vehicle to charge.
> Throwing the connector in a puddle and having the
> charging station accidentally connecting the 240V
> may be dangerous, but does not damage the Leaf.
> The only ways that I can see that a charging station
> can damage an EV like the Leaf are:
> 1. It fails to deliver actual charge so the EV dies
> (not likely to result in damage as the owner will
> detect the absence of charge and charge elsewhere)
> 2. The charging station causes signals on the Pilot that
> cause damage to the EV. Not likely as there are clear
> standard mandatory values to implement the signals
> and the 12V and resistance values only allow low current
> not likely to blow any diodes or cause other damage.
> 3. The charging station causes spikes or other surges on
> the 240V wiring that exceeds isolation or current ratings
> of the EV charger and blows it up. This may be something
> where a charger closes or opens a contactor in a way that
> causes spikes or hard surge currents that cause the input
> components on the charger (such as rectifier diodes) to
> fail prematurely.
> The latter seems to be the most likely problem with the
> WattStation and adding some surge suppression or a filter
> that allows better control of 240V voltage and current
> will probably all that is needed to make it well-behaved.
http://www.fastmail.fm - Same, same, but different...
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