Bewaretheicespiders t1_j509uj1 wrote
Reply to comment by iqisoverrated in Electric vehicle batteries alone could satisfy short-term grid storage demand by as early as 2030 by BlitzOrion
>Not really. Most EVs charge at night when demand is very low and wind energy is,
The demand is going to be high at night when ev adoption is high
Demand is going to be highest at night in northen latitudes if people abandon fossil fuel for heating the house. See Quebec.
You gain some wind at night (unreliable) but you lose all solar
People will want their car charged in the morning.
Batteries degrade with each charge and discharge cycle.
EV adoption guarantees that peak demand will drift towards the times when people charge their time. Its a self-defeating scheme.
iqisoverrated t1_j50ffqg wrote
>The demand is going to be high at night when ev adoption is high
Which is good. Better utilization of assets. You can do the calcs quite easily how much the total power draw over night would be with a 100% EV fleet (hint: it isn't nearly enough to stress the grid in any way)
>You gain some wind at night (unreliable) but you lose all solar
Offshore wind is pretty reliable. Yes, we'll need storage (we'll need that anyways)...but if we didn't have those additional consumers at night we'd need a lot more storage or curtail wind production (both of which would drive up the price of power).
>People will want their car charged in the morning.
Sure, but even so: Most people know what kind of mileage they will require the next day. Having 100% (or even 80%) SOC isn't required. EVs are exceptionally suited to level out such short term variability because for the overwhelming majority of the time they carry around a lot of unneeded battery capacity.
>Batteries degrade with each charge and discharge cycle.
Sorta. Really depends on how much you stress the battery. Charging/discharging at 0.1C is different than going in at 3C.
In a V2G (or V2H) mode you're dealing with such low C rates that there's no real stress there. Batteries are also far longer lived than the life expectancy of cars. From an LFP battery you can expect 1 million miles service life. From an NMC/NMA about 500k miles. The average car sees the scrap yard after 150k miles. If you consider yourself even close to 'average' then you have plenty of cycles to spare.
...and, of course, you're making a buck while serving the grid.
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>EV adoption guarantees that peak demand will drift towards the times when people charge their time.
If you think about just plugging in? Maybe. But if you do it via smart meters/smart chargers (which is e.g. what they are subsidizing where I live - not the dumb ones) then that use pattern can be shifted without any impact on user comfort. If everyone charges from 18:00 to 24:00 then that's an issue because there's a lot of demand in the 18:00-20:00 slot. But if everyone charges from 23:00 to 5:00 it's no biggie.
And if you don't feel like mandating V2G/V2H you can always regulate it via time of use metering and offer low power prices at night.
Almost no one will care which slot the car charges in as long as there's adequate SOC in the morning.
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