tjz wrote:I just don't buy this 6-7KW will kill the grid argument. Every time I do the laundry and check out my power usage with my TED, I see my household power spike by just that amount - I have an electric hot water heater and I run my electric dryer. I have a gas oven, but If I had an electric one, and was baking at the same time, I'd see a 10KW spike. The grid is already able to handle those type of fluctuations - I live in a neighborhood with ancient electrical infrastructure and I've not seen exploding transformers or complaints from the utilities when my neighbors and I use our 240V appliances. This is just fear of the unknown, I think.
Consider what the transformer sees. Out of a group of homes, how many are drying clothes at the same time? How many are baking at the same time? How many ,even, have their central AC compressor running at the same time? Compare to an EV where, absent a strong TOU incentive, most everyone is going to plug in when they get home, for a constant multi-hour charge, which is going to be superimposed on what was already the peak load.
I agree almost exactly except for the last statement "Compare to an EV where, absent a strong TOU incentive, most everyone is going to plug in when they get home". I don't do that and I don't have any TOU incentives and have solar to cover the Leaf to boot. I think in the 2 months I've been driving my Leaf I've only done that twice. A couple of other times, it would have been really nice to have used 6.6KW (or QC) so I didn't have to drive my ICE car.
I think the average EV owner is sophisticated enough to know that isn't the best way to load up the grid and at least for the Leaf the timers are very easy to set and forget once you get used to them. If the Leaf didn't have timers, I'd use the one built into my EVSE. Don't sell us short.
I think a far bigger worry is the amount of new and existing AC units running at peak load that we are going to see as things continue to warm up. I don't think EV peak load will be a worry for decades compared to other loads. I'd love to see EV adoption ramp up to the point it did become a worry, and as you mention, a strong TOU incentive will change most folks behavior w/o any change to the grid other than smart metering.
Driving: 2012 Nissan LEAF SL trim, Glacier Pearl, Protection Package, Splash Guards, Organization Package
EVSE: Schneider EVlink EV2430WS