If you are concerned about your EV somehow supplying unwanted
current, burning up wires, juicing an electrician, etc. one could
think of several ways to electronically sense if the grid had gone
dark, or some circuit breaker in the chain had tripped.
I agree that if the GFCI didn't trip when drawing current (like when
normally charging,) then it certainly won't trip when supplying
current. Not an issue.
A lone 20 amp 120 volt circuit doesn't matter for frequency
stabilization, but large numbers of 20 amp 120 volt circuits would.
If V2G were a standard feature in EVs, and a large number of EVs were
plugged in, then it would make a big difference. However, simply
listening for a central instruction from the local utility to "pause
charging" for a few minutes would be _much_ cheaper to implement and
would be nearly as effective.
The local utility issues such signals to "saver switch" type devices
here in Colorado:
http://www.xcelenergy.com/Save_Money_&_Energy/Rebates/Saver%27s_Switch_for_Residences_-_CO?stateSelected=true
You can put your EV charger on a "saver switch" that is controlled by
the utility. Simple.
Bill Dube'
At 12:32 PM 6/6/2014, you wrote:
GFCI has no influence on backfeeding, except when a ground fault
triggers it and it disconnects.
I agree that L1 power is sufficient for charging EVs most of the time
(I am 99.9% L1 charge user)
My only concern is if the grid support can be delivered through L1,
in other words - can an EV give a meaningful support to the grid if it
is limited to 1.5kW?
The other concern is that most L1 outlets are shared (I mean: more
outlets on the same circuit breaker) whereas a backfeeding generator
preferably is on its own breaker to avoid that you can draw power power
from the *other* outlets than that the breaker is protecting - there is
a small risk of burning up the wires without the breaker triggering if
the backfeeder if giving a steady stream of power (most notably this
occurs with solar, that is why an inverter is typically always on a
separate circuit with no other loads connected to the same circuit).
Since I have no clue about the typical power levels involved with grid
stabilization, I leave my first concern unanswered - hopefully someone
else can contrtribute meaningfully to that one.
Cor van de Water
Chief Scientist
Proxim Wireless Corporation http://www.proxim.com
Email: cwa...@proxim.com Private: http://www.cvandewater.info
Skype: cor_van_de_water Tel: +1 408 383 7626
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