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Comment by somedude895 | Hacker News Reader

That's exactly what I want is for my car's battery to be drained overnight.

If you set the app to allow it to be drained overnight, then it may be drained overnight. Similar to forgetting to pump gas into the tank and getting stranded in the middle of nowhere. Most people are a bit smarter than that.

What about the top 10% or 20%? It would be just like using “reserve mode” but you’d get paid for it. And have the option to turn it off before a road trip.

And have extra wear on your battery that would far outweigh anything you’d get out of it?

I’m down about 18% capacity after 4 years of owning my current EV. It’s still plenty for my needs but I would be very disappointed if I saw this capacity drop much sooner or if it drops much more.

A replacement would be ~$15k and the cost of replacing the car would be a lot greater.

I’m very much digging the current strategy of grid-tied batteries and the myriad of companies working to re-use battery packs for grid batteries.

If it's any reassurance, I think the consensus is that the rate of degradation of your battery will slow considerably once it gets past 20% (of the order of 1-2% per year, i.e. the battery will outlast the rest of the vehicle by a long way) [0].

0. https://arstechnica.com/cars/2022/07/heres-one-way-we-know-t...

If $15k gets you a pretty big LFP battery, then you can get hundreds of thousands of kWh of use under gentle conditions like V2G. There are plenty of situations where 2-5 cents of wear per kWh is very worth it.

And if you do replace that battery, and you can't get a huge discount from selling the old one, then slap on a $500 inverter and install it at your house to keep using for the next 20 years.

I think it's perfectly sensible to charge it at work to full, then partially discharge in the evening after coming back home. Especially since that energy could mostly power your own home. If you have enough left in the morning to drive back to work it would be fine.

Basically you would haul (hopefully cheap) electricity form your work, to your home to use it in the evening.

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