That is why batteries TRIPLE the cost compared to a grid system and also require summer/winter life style changes: 1) As you say, when the batteries are full, all your solar investment is doing *nothing* 2) In order to have power on cloudy days, you have to oversize the batteries 3 to 5 times a day's capacity 3) Combine #1 and #2 and your solar is spending 1/3rd of most days doing *nothing* 4) You cannot store in batteries the 2X more energy you get in the summer for use later in the winter 5) So, you either throw away half of your solar production in the summer and live a tolerable winter life style 6) Or you invest for your summer lifestyle and then just survive the winter with half power.
Battery storage when you have the grid (net meter) is simply not economically practical in any way whatsoever. (Unless you get free batteries and are willling to maintain them for the rest of your life)... Bob Author http://aprs.org/Energy-Choices.html On Sun, Jul 14, 2019 at 10:06 AM Peri Hartman via EV <ev@lists.evdl.org> wrote: > How hard would it be to build a battery system that normally supplies > 100% of the domestic power but, when depleted, switches over to supply > domestic power from the grid ? Also, I think it would be safe > assumption, or at least a reasonable simplification, to assume that the > battery is always sufficient for the load, except when depleted. The > battery would always be charging from a solar array, never from the > grid. > > It seems to me, a system like this would completely circumvent any > negative conditions imposed by power companies. Of course, once the > solar panels fill the battery, excess production is lost. > > Peri > > ------ Original Message ------ > From: "Robert Bruninga via EV" <ev@lists.evdl.org> > To: "Electric Vehicle Discussion List" <ev@lists.evdl.org> > Cc: "Robert Bruninga" <bruni...@usna.edu> > Sent: 14-Jul-19 4:54:09 AM > Subject: Re: [EVDL] Solar off grid with an EV? (transformers) > > >For what it is worth... For off grid or backup power,.I have some 500W and > >2500W 120 VAC to 240VAC transformers. Great for stepping up a single > phase > >120v generator to 240 VAC for a well pump or other emergency power needs. > > > > > https://baltimore.craigslist.org/ele/d/glen-burnie-v-transformers/6928546512.html > > > >$30. Baltimore area. Will not ship. > > > >On Sun, Jul 14, 2019 at 12:40 AM Michael Ross via EV <ev@lists.evdl.org> > >wrote: > > > >> I get all that because I have panels and a net metering plan with Duke > >> Power. As I said it depends on whether your utility supports what you > want > >> to do. Clearly, YMMV. > >> > >> I personally could do exactly as I described. If I had an EV that > needed > >> charging regularly, I could put up a ground based array of > microinverter > >> 120VAC output arrays, and add to them pretty much at will. If I over > >> produced then Duke would bank it. In the billing month that contains > May 31 > >> they would zero out any bank I had developed. I could live with that. > >> > >> < > >> > http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail > >> > > >> Virus-free. > >> www.avg.com > >> < > >> > http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail > >> > > >> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > >> > >> On Sat, Jul 13, 2019 at 7:06 PM Mr. Sharkey via EV <ev@lists.evdl.org> > >> wrote: > >> > >> > >>We're going back to the way intertie started off decades ago. The > >> > utilities > >> > imposed impossible technical and insurance requirements on net > metering, > >> > which led PV hobbyists to start the Guerrilla Solar movement -- > >> essentially > >> > doing grid intertie on the sly. > >> > > >> > This is veering around and nearly clipping the Off-Topic guardrails, > >> > but because you brought it up: > >> > > >> > At least one to-be-left-unnamed EV driver and solar enthusiast was > >> > guilty of participating in that clandestine program: > >> > > >> > http://www.westlanetv.org/~sharkey/gsolar.pdf > >> > > >> > And here's what happens when the utility figures it out: > >> > > >> > http://www.westlanetv.org/~sharkey/Amnesty_for_Solar_Guerrillas.pdf > >> > > >> > (see lower right of first page, and upper left of second) > >> > > >> > I, er this guy, got off easy, they could just as easily sic'ed the > >> > County permit and inspection authority on me, uh, him, threatened > >> > utility power disconnect, or applied other punitive sanctions such as > >> > a retroactive energy charge of their own estimation. In the end , all > >> > the utility wanted was to stop being annoyed by the alarms and alerts > >> > in the new software program that they were running to administer the > >> > smart meter program for 79,000 customers. > >> > > >> > Before I go, R.I.P. to friends Richard and Karen Perez, and goodbye > >> > to Home Power Magazine, which ceased publication in October of 2018. > >> > > >> > ____________________________________________________________ > >> > Drink This Before Bed, Watch Your Body Fat Melt Like Crazy > >> > Diet Insider > >> > http://thirdpartyoffers.juno.com/TGL3131/5d2a63e484ff63da646est01vuc > >> > _______________________________________________ > >> > 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) > >> > > >> > > >> > >> -- > >> Michael E. Ross > >> (919) 585-6737 Land > >> (919) 901-2805 Cell and Text > >> (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, > >> Google Phone and Text > >> -------------- next part -------------- > >> An HTML attachment was scrubbed... > >> URL: < > >> > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190714/c41c8d38/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/20190714/c8dcf508/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) > > -------------- next part -------------- An HTML attachment was scrubbed... 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