Amen! We all want direct DC to charge. But so far, I have not seen any DIY approaches. What I woiuld love to see someone do is feed DC into their EV using their existing J1772 EVSE.
As long as it is a 120v EVSE that does not use a tiny 12v transformer for its internal electronics, then it should be fine. And the car "should" be fine because the first thing it will do is full wave rectify the DC. And since EVSE do not communicate voltage, but only current, then full wave rectified 240 VAC is 330 VDC and so feeding 330 VDC directly from the panels via the EVSE "should work fine" and charge at the 12 amp limit of the EVSE for over 4 kW! Every modern universal 120v device I have tried works as well on 300 VDC as it does on 120v AC. But who is the fool to test it on their $15k car? Bob -----Original Message----- From: EV <ev-boun...@lists.evdl.org> On Behalf Of George Tyler via EV Sent: Wednesday, August 14, 2019 9:21 PM To: paul dove via EV <ev@lists.evdl.org> Cc: George Tyler <g...@tylernz.com> Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home) I have been considering this too, seems silly to convert the solar panel power to 50/60Hz AC, into the Leaf, then to DC to charge the batteries again! I am thinking it would be better to have solar always below 360V (lowest leaf battery voltage) and a boost converter or isolated topology to charge into the Chardemo port. Boost would mean it does not have to handle all the power, but I am a bit nervious of having the leaf battery galvanically connected to the panels! Electronics would be very similar to a Chardemo charger I guess, will have to have can bus etc, but then you can do all kinds of other things that will help, like set the charge level to anything you like, V to G, etc too. On 15-Aug-19 6:33 AM, paul dove via EV wrote: > I mean from the solar panels, disabling them. > > > On Wednesday, August 14, 2019, 12:50:01 AM CDT, Cor van de Water via > EV <ev@lists.evdl.org> wrote: > > All grid tie central inverters (so, not the micro inverters) take input > voltage above 400V so they can direct switch the AC output without > transformers. Input is typically up to 1000V these days. > I plan on installing solar strings of at least 400V so that I can always > charge my EVs by direct wiring the panels to the battery, in case there is > no grid and I need energy in my EV. > I also have a large UPS that is intended to run with 2x 192V lead-acid > batteries (it is an older model double conversion UPS) so I am planning to > connect it to a Leaf pack with center tap so it can both charge the pack > as well as island like any UPS to feed any critical loads in the house. I > need to see if it has the power saving setting where it is not always > double converting (wasting power) and just keeps the battery charged, but > feeds the incoming power through until there is a power loss, then it > instantly starts converting battery power to output without even losing > the output. > With such a setup, it would be possible to use solar in 2 ways: DC only to > directly charge the UPS batteries (but needs overcharge protection and > waste power as soon as batteries are full) or the usual string inverter > generating AC to feed back into the grid and independently run the UPS to > keep the batteries charged and generate uninterrupted power. Only drawback > is that during an outage, the solar inverter trips and does not generate > power, but this should happen only rarely. > > Cor. > > Sent from Mail for Windows 10 > > From: Robert Bruninga via EV > Sent: Tuesday, August 13, 2019 7:06 PM > To: Electric Vehicle Discussion List > Cc: Robert Bruninga; jkenny23 > Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home) > > Thaniks. Yes, I got it wrong. I updated the web page . > > So now a use leaf is about 2.3 power walls but a bit over half the price. > Thanks for the tip. > > bob > > -----Original Message----- > From: EV <ev-boun...@lists.evdl.org> On Behalf Of jkenny23 via EV > Sent: Tuesday, August 13, 2019 6:31 PM > To: ev@lists.evdl.org > Cc: jkenny23 <jkenn...@gmail.com> > Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home) > > Minor correction, your 3 year old Leaf is only 30kWH max (with less > actually usable, limited by on-board BMS). It would only take a bit of > clever reverse engineering to make use of ChaDeMo capable Leafs by > controlling the contactor to close and feeding a high voltage solar > grid tie inverter (I believe there are models that can use up to 400V > already). > Then you could use up to 20kW comfortably. > > -- > Sent from: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > _______________________________________________ > 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) > _______________________________________________ > 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/20190813/7a > d6c2b3/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) > > > -------------- next part -------------- An HTML attachment was > scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190814/43 > ed784c/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) > _______________________________________________ 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) _______________________________________________ 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)
