David, I expect that vehicles will allow both AC and DC charging. So, L2 public charging will still work, as does your convenience charger that you already carry. So this allows charging from the existing L2 network and built-in 6kW charger in the vehicle. But owners (and industry) want faster charging. In Europe it is possible to charge at 11, 22 and even 43kW using 3-phase 400VAC (230V per phase) at up to 63 Amps. But almost no vehicle implements this high power AC charging, because it means that the EV needs to lug that big charger around in the car. DC charging only consists of an inlet, a pair of contactors plus a small computer board in the car. All the conversion is in the charger itself. When already having Solar, it is possible to stay DC all the way from the panel, to the solar storage battery (when present) and to the DC EV charger.
The DC chargers, because they connect directly to the vehicle battery, have the ability to draw current *from* the battery to send power to the home or grid, to help with stabilizing the utility grid. It does not take much energy from the battery, so there is little degradation of the vehicle battery, but you can get paid good money to help stabilize the grid and increase the amount of Renewable Energy that can be placed on the grid, by helping to shape the load to the availability of RE. Last but not least, DC charging is faster. Suitcase size DC chargers of 25kW (half power) are becoming more common, 50kW is the standard but often a bulky charger while even higher power is being rolled out. Regards, Cor. Sent from Mail for Windows 10 From: David Nelson via EV Sent: Monday, December 24, 2018 6:25 PM To: Electric Vehicle Discussion List Cc: David Nelson Subject: Re: [EVDL] EVLN: L3 DC charging leaves L2 AC face-down in the dust > Meanwhile, home DC charging is on the way. Utilities that incentivize AC > home charging may soon find that customers are already moving on to more > efficient DC home charging that can connect to the grid, store energy, and > send and receive utility pricing signals. How is off board home DC charging more efficient than what already happens now with home charging? There is still an AC-DC conversion happening so why complicate home charging installation, especially if I would then have to carry around an AC-DC charger rather than a less bulky EVSE to charge most anywhere? -- David D. Nelson _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20181225/bc5f78d6/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
