Another consideration is maybe picking up a used battery pack from a wrecked vehicle and using it for home backup / grid power time shifting / off grid with solar. With time of use, you can see a difference in power cost of 6x between nighttime (9pm-7am) and peak (5pm-9pm) from my local power utility.
Charging a battery at night and switching to it during peak could be very cost effective. I wonder how much work it would be to create a flexible powerwall product using a used pack(s) obtained for cheap with lots of life left. You just need to be able to close the pack contactors and monitor the BMS to prevent over charge/discharge. I have seen projects to do this with a leaf battery as the CAN bus commands to do all this is pretty easy. Phil H. On Fri, Jun 28, 2024 at 10:39 PM Haudy Kazemi via EV <ev@lists.evdl.org> wrote: > There are plenty of fully out-of-warranty Tesla vehicles out there today > (IIRC, max battery warranty was 8 years/unlimited miles, min was 8/100k > miles on shorter range cars), and lots more that will be out of warranty > soon. Combined with Magnuson Moss, and Tesla's own precedent on the CT + > onboard AC export + Wall Connector Gen 3, the warranty clause may be a moot > point. > > It's unfortunate there isn't an official solution. This is something where > the competition has stronger offerings. > > I think the strongest use case for power export is V2L, for emergency > backup or off grid site power (camping, construction). Those cases aren't > likely to go through many kWh compared to actual driving, and they're at > low C rates, so should be low stress on a big pack. > > V2H and V2G are interesting but I think V2L has the most immediate value. > It is also what is available on Hyundai and Kia EVs via a simple J1772 to > NEMA 5-15 outlet adapter. (V2H is interesting from a potentially seemless > charging/home power backup perspective, though it may need load shedding. > V2G *might* be interesting, but that really depends on what the paid value > is for each kWh vs the cost of the extra battery wear, and how much that > extra wear affects the primary use case for the battery.) > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240629/b60300d5/attachment.htm > > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240628/5b580fe0/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
