[georgeg23]

The nature paper seems to assume the car is doing a fast discharge to supply enough energy to the grid, so something like supercharging-- probably not the best on the battery. Tesla only warranties 375 cycles, so not sure what you mean? The 18 cents/kWh already assumes a more generous 1,000 cycles.

The $12,000 battery pack replacement cost is current market price, including any recycling or potential reuse of old pack.

Edit: actual battery replace including labor is $16,550 from a receipt https://www.currentautomotive.com/how-much-does-a-tesla-mode...

[hdevalence]

I don’t know about the nature paper’s assumptions, but supercharging provides far more power than could possibly be supplied to the grid via V2G — for instance, a 100A home service can draw at most 24kW (AC), while supercharging draws up to 250kW (DC). V2G would use the car’s onboard AC/DC converter, which usually tops out at 10-12kW, so it would be relatively slow discharge from the car’s perspective.

Edit: from the paper:

> We assume the home charging power as 1.92, 6.6, 22, and 1.92 kW for small, mid-size, large BEV, and PHEV, respectively

I don’t think the 22kW assumption is reasonable, but the others are comfortably within current L2 AC charging rates.

[themitigating]

If you have a high mileage car and the engine blew up would you buy a brand new engine or get a used one?

On US ebay I see model 3 batteries for $5k

A BMW engine (the b58) is about $5k used, about $10k rebuilt, and somewhere above $20k new.

[zdragnar]

1,000 cycles is only 3 years (assuming a daytime commute plus discharging to the grid plus re-charging back up counts as a cycle). Most cars are definitely still under warranty after 3 years of driving (assuming a 5 year / 50k mile warranty).

Regardless, if you do have a high mileage ICE car that you want to save, the used engine is probably the way to go, and won't suffer a crippled range of a used battery.

In general, I like the idea of electric cars, but battery packs are not on the same level as an ICE engine in terms of replacement. If you're in the unfortunate position of owning something like a Volt, odds are you literally will not even be able to get replacement battery- and if you could, it would cost more to buy and install than the car would be worth when you were done. That exact scenario hit the news at least twice in the last year.

[fomine3]

Cycle count is counted for every 0-100 charge/use. 1000 cycles in 3 years is unlikely for normal home use.

[zdragnar]

So, assuming commute + feed into the grid + recharge, it's closer to 5 or 6 years, and only the first two or three are under warranty?