Lothsahn said:
If I had a 250 mile ev, and I could set it, I'd tell the battery to stop charging at 55%, and then I'd just drive it down to 40% before charging. The battery would last a long, LONG time, even if it didn't have thermal management.
From what I recall, the Bolt has a setting like that. If it's properly refrigerated, a battery kept between 40-60% could last 30 or 40 years without more than 10-15% degradation. Over that timespan, though, one might have to hedge against new batteries becoming available! If the chemistry is ever worked out on a large scale, people could end up having flow batteries in their garages that hold electrolyte for something like $10/kWh.
Lothsahn said:
Now, once we get Vehicle to Home working, a 70 kWh battery for battery backup for my house would have TREMENDOUS value. I've been quoted $30k for 30 kWh of battery storage. If I could get 70kWh for half that (plus the V2H charger) in my EV, I would be extremely interested.
That's a really interesting perspective! One would think stationary storage would be cheaper than mobile storage, or at least 50% closer to the cost at the pack level, but that hasn't historically been the case. If a Tesla EV's non-battery cost can be qualified as about $600/kWh, it almost seems that a $7k/13.5kWh Powerwall's non-battery cost is still around $400/kWh (despite not needing any of the expensive
car hardware). There's plenty of market opportunity there for a company with a good understanding of home/grid safety certification requirements.
Vehicle-to-X, at least on the Leaf's side, seems to be a software update away if not already possible with the right CAN messages. If you already have solar or an off-grid generator, your house is mostly ready to handle the grid/V2H switchover. The same reasons that have held Tesla and Nissan back from actually rolling out V2H/V2X would probably apply to an aftermarket battery manufacturer, though. Suffice to say - probably wise to park your car outside (or in a fire-suppressed garage) if you're using it for V2H.
Save the invention of some retrofit CHAdeMO or CCS port, your LEAF is probably destined for the junkyard around 2025-2027. All of the transport-adjacent benefits from a larger battery disappear without a way to easily access the pack directly.
Aside: the feedback shared in this thread has been super informative. Making useful transportation infrastructure available to lots of people is possible, but it doesn't require junking a quarter million aging EVs or spending $20k to over-upgrade each one. I'll share a bit more about this work in a few weeks and will make sure everyone who's posted here has access of some kind.