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by led76 920 days ago
I'm not sure it would have much of an adverse impact. Driving the car is constantly charging / discharging it (regen braking).

I think it's more about how deep the cycles go -- just don't let the grid drain below like 30-40% battery and it likely would have no meaningful impact long term.
2 comments
sandworm101 920 days ago
I'm not sure it a totally rational thing. This is effectively putting more miles on your battery, an item that costs tens of thousands of dollars to replace, if even possible years after purchase. There would have to be a substantial compensation for such use even if it only degraded the lifetime a few percent.

But at such a compensation level, one could probably just purchase deep cycle lead acid marine batteries. They could sit in one's basement charging/discharging at a much lower cost than the lithiums in a car.

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thelastgallon 920 days ago
The price of batteries has declined by 97% in the last three decades:https://ourworldindata.org/battery-price-decline. And it continues to go down! The chart ends at 2018, $181/KWH. 2024 forecast is $94/KWH (half of 2018 price), 2030 forecast is $62/KWH. Thats just Lithium Ion. Newer chemistries are even cheaper. CATL first-generation cells (Sodium Ion) cost $77 per kWh, expected to drop to $40/KWH.[1]

Current estimate for a battery replacement is 4K - 20K. With energy storage's learning curve, this will be soon under $3K.

1)https://www.nextbigfuture.com/2022/12/catl-will-mix-cheaper-...

https://about.bnef.com/blog/behind-scenes-take-lithium-ion-b...

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gnicholas 920 days ago
> Driving the car is constantly charging / discharging it (regen braking).

My understanding is that the impact on battery longevity relates to the rate at which it is being charged/discharged. Accelerating and regenerative braking are small potatoes compared to charging over a typical level 2 system, I would think.

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_ihaque 920 days ago
Level 2? Certainly not.

A typical L2 charger will provide in the range of 6-10kW (AC, marginally less ends up going to the battery after conversion losses). 10kW is only 13hp; forget acceleration - the car draws more than that at highway speeds.

(You can come at this result another way too - an L2 charge may take 6-10hr to refill the battery from empty. But the car would not be able to drive 6-10hr at highway speed starting at 100% charge! So the L2 must be delivering less power than the car consumes at cruising speed.)

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