I think an onboard inverter-charger would be the way to go for this kind of thing. I'm not sure how much size/weight penalty there is (if any) for a bidirectional inverter charger design vs charger-only design.
Tesla has onboard 240v 48a AC chargers on most of their vehicles. If those were bidirectional inverter-chargers, they could meet the specs needed for a NEMA 14-50 or 14-60 outlet (240v 50a AC [40a continuous] or 60a [48a continuous]. Pair that with a normal J1772 compliant EVSE, and now you're transferring energy. And you could run nearly any home appliance. 240v 48a charging is 11.5 kW. A 30 minute roadside boost would move about 5 kWh, allowing the other car to drive maybe 15-20 miles, which hopefully could get them to a grid connected Level 2 or 3 EVSE. The other idea is an e-tow rope. That would be a tow strap with power cable from the towing EV to the trailing EV. If the trailing EV had a suitable Autopilot/FSD implementation, maybe it could automatically track itself behind the front EV. Or the 2 EV computers could coordinate directly to ensure synchronized acceleration, steering, and braking. Steady state driving in a car tends to need around 20 kW, which is 50a at 400v, and could be handled by 6 AWG wire. On Sun, Oct 24, 2021, 10:42 Peter VanDerWal via EV <[email protected]> wrote: > Stumbled across this article: > > https://www.motortrend.com/features/how-to-flat-tow-recharge-electric-vehicles/ > > which had an interesting comment: > "...the Rivian R1T and R1S, Lucid Air, and Ford F-150 Lightning all offer > bi-directional charging and a cord with a CCS Combo 1 charging plug on both > ends." > > Cool! First I've ever heard of this. > > Just curious how this would work. Obviously the donor vehicle would have > to provide the appropriate CCS communications to convince the recipient to > engage it's HV contactors. > > Would this charge be controlled in any way, or do they just connect both > batteries together and hope none of the magic smoke leaks out? > > Without having a massive DC-DC converter in between, I'd guess the charge > would basically stop when the batteries in both vehicles reach roughly the > same SOC. > > -Pete. > > My PGP public key: https://vanderwal.us/evdl_pgp.key > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20211024/f98265d8/attachment.html> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
