> instead of a single top up change it is now constantly discharging and charging
This is where V1G beats V2G.
V1G (AKA grid-adaptive charging) just chooses when to charge the car, to efficiently spread out the grid load overnight and spatially across the network. No extra charge cycles, in fact it's probably more mild than just charging at full speed.
The key is that you need a UI setting for "Immediately charge to X%" and "Charge to Y% by Z:00." This avoids the problem where you find yourself without enough charge to get to work (or the local hospital).
> you will now see multiple 0%-100% charge cycles daily.
Even for V2G, why wouldn't there be a depth of discharge slider?
> if its lifetime will be shortened... then electric company need to compensate owners
Or better yet, owners set their car to only "bid" for a grid storage job when the cost-per-kWh is greater than the cost of degradation.
This should be the default after enabling V2G.
> The key is that you need a UI setting for "Immediately charge to X%" and "Charge to Y% by Z:00." This avoids the problem where you find yourself without enough charge to get to work (or the local hospital).
I would be happy to let the grid operator decide when to charge my EV, especially if I could inform them when I wanted charge by and have an override button to be ready for road trip departures.
I wonder how long it will be before the grid operators are subsidizing parking lot operators and businesses to install tons of smart L2 chargers so commuter vehicles are absorbing all the excess solar power available mid-day that would otherwise go to waste.
> Or better yet, owners set their car to only "bid" for a grid storage job when the cost-per-kWh is greater than the cost of degradation.
It would have to be substantially greater. I'm not going to deal with reduced battery capacity and the hassle of replacing it early for a couple of cents here and there.
Considering the extra cost of equipment to allow the EV to send power to the grid, I don't think the economics will ever work out.
That's the great thing about choice: you can choose your price! But it sounds like V1G might be a better choice for you instead of V2G.
The economics don't work out at the monthly average rate. That's why storage only kicks in when spot prices are well above average.
Thank you for posting this. This focus on V2G is nuts.
We move huge volumes of our residential portfolio every day just setting EV schedules - enough that our total residential profile peaks at market bottom price hour nearly every day, even in winter with lots of ”dumb” heating load.