It also stops sending current to your breaker panel thus shutting off the solar power.
Sent from my iPhone > On Aug 14, 2019, at 9:47 PM, Cor van de Water <cor.vandewa...@gmail.com> > wrote: > > Paul, > Tell me how you switch a solar panel off? > Only way I know is to throw a light blocking cover over the panels. > > What the solar inverter does when it detects any anomaly in the grid is to > stop sending current into the grid, effectively stopping the transfer of > energy from solar to grid. Depending on the design of the inverter, it may > remain powered from the solar input and ready to restart as soon as the grid > is again within limits. Other designs are powered from the AC input and > completely turn off when the grid goes away, despite power from the solar > being present. > As a result of not using the solar power, the solar input DC voltage will > climb to the OC (Open Circuit) limit, the actual voltage level is dependent > on solar irradiation and temperature of the panels. In freezing conditions > when the full sun suddenly appears from behind a thick cloud you get the > highest output voltage and this *must* be below the max rating of the > inverter (or it might blow up) so that is one of the design constraints for > the solar system, one of many reasons that MPPT voltage is typically a LOT > below the max voltage of the inverter. > Installers will demand that they get the OC voltage of the panels at the > lowest recorded temperature for the area where they will do the installation. > > Sent from Mail for Windows 10 > > From: paul dove > Sent: Wednesday, August 14, 2019 11:32 AM > To: Electric Vehicle Discussion List > Cc: Cor van de Water; jkenny23 > Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home) > > I thought grid tied inverters shutdown the solar panels when no grid power is > detected. > > > 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/20190813/7ad6c2b3/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... 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