Microinverters will not work without a grid bob -----Original Message----- From: EV <[email protected]> On Behalf Of Michael Ross via EV Sent: Friday, July 12, 2019 6:57 PM To: Electric Vehicle Discussion List <[email protected]> Cc: Michael Ross <[email protected]> Subject: Re: [EVDL] Solar off grid with an EV?
I haven't looked closely at this, but panels with on board micro-inverters are nice because you can buy one now, buy another one later, etc., until you have the kW you want. They output 120VAC. Seems like a good way to support an EV, or at least cover some of the charging with solar. I suspect that trying to have home EV charging all from solar, is the same problem as running a home with all solar - it really drives up cost planning for peak demand, and dealing with cloudy days - fi you are going to store a large excess that is going to be a a lot of batteries. It makes a grid tied system the economically pleasing choice. You can grid tie micro-inverter panels. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_c ampaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_c ampaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Fri, Jul 12, 2019 at 4:18 PM Robert Bruninga via EV <[email protected]> wrote: > Yes, But of course, solar can only charge the EV during the day. The > simplistic approach using off-the shelf components would need a > minimum of > 2 kW of solar panels (8 or more) to be sure tha most solar days could > produce the absolute minimum of 1.5 kW which is the minimum standard > 120v EV charge cord. > > But then you have to go from the DC solar panels at 30v or so to the > 120 VAC needed by the standard charge cord. To do that, you need a DC > solar battery charge regulator, then a small 24 volt battery (to > smooth the > energy) to drive a 2 kW 24votl AC inverter. Then you plug the car > charger into that. > > And you have to have a low-voltage cutout circuit so you don't run the > 24v battery down when the clouds come oue, etc... > > So as you can see, it is a kludge of off-the-shelf items because no > one has yet built a consumer device to take direct Solar DC and handle > all these functions to deliver stable power to the car. > > If that property has the grid to it, it makes no sense to ever > consider going off grid. Because with a net meter you have 100% free > solar storage. And for a remote vacation property that is only > occupied say 10% of the time, then you only need 10% of the solar > panels because those 10% can be storing months worth of power in the > grid (via the net meter) that is available to your instantly anytime you visit the house. > > Off grid makes zero economic sense if the grid is available. But if > the grid is not available, then off-grid is the only way to go, BUT > the solar array has to be X times bigger to accommodate the full power > needed in the single worst day need. Where as with grid tie, a much > smaller set of panels can be stroing a yeaers worth of sunshine in the > grid for free that you can draw out at any time and at ANY rate... Up > to the maximum capacity of the grid-to-the-house. > > Bob, WB4aPR > Author http://aprs.org/Energy-Choices.html > > -----Original Message----- > From: EV <[email protected]> On Behalf Of Mark Laity-Snyder > via EV > Sent: Friday, July 12, 2019 3:55 PM > To: Electric Vehicle Discussion List <[email protected]> > Cc: Mark Laity-Snyder <[email protected]> > Subject: [EVDL] Solar off grid with an EV? > > Hi all, > > Would it be possible to hook a small solar panel system to an EV and > use the EV as the battery storage for an off grid solar system? What > would be needed to make that happen? I envision solar panels > connected to microinverters which would then charge the EV. Then if > you needed power at night, you could use some power from the EV. > Would that work? Would you need another part to that puzzle to get it > to work? Would it cause problems for the EV? > > I am not looking to do this myself but we had a guy come and charge > his Tesla at our place. He has a lot and camper where he goes camping > and would like to install solar and be off grid. I was just wondering > what that setup would look like. > > Mark. > _______________________________________________ > 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) > > -- 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... 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