> So, the net benefit of the battery in my situation > is probably less than $1/day.
But it is not needed at all since you are grid tied. And buying and selling power is the function of the net meter and has nothing to do with the battery. I still do not see any value to the battery in that process. (other than backup). Yes, you are selling the utility about $1 per day of solar, and buying it back a s you need it at night, but that is to and from the grid via the net meter. The battery does not have anything to do with it and is not needed as you say when the grid is up and absrbing your excess solar energy. Its only value is backup. Bob On Sun, Jul 14, 2019 at 1:41 PM Willie via EV <ev@lists.evdl.org> wrote: > > > On 7/14/19 11:28 AM, Robert Bruninga via EV wrote: > > What you described seems to be a net-metered system. You are buying and > > selling power to the grid. You produced say 10,000 kWh and you bought > > 10,000 kWh. For a NET energy payment to the utility of zero. The goal > of > > any home solar system. > > I guess we have a clear writing problem on my end. Or, maybe a > comprehension problem on yours. Or, maybe some of both. > > I tried to say that I am buying almost no energy from my utility and I > am selling them quite a lot. The overhead or connection fee is about > $25/month so, at $.06/kwh which is my selling price, I have to give them > about 600 kwh per month to reach a zero bill. Right now, my monthly > net bill is a credit of about $100/month. I'm hoping to eventually get > that up to several hundred dollars per month. > > > > So that is what net metering is all about. So... What value then is the > > battery? It adds nothing to that equation other than a fixed $13,000 up > > front loss that can never be receoverd.? What am I missing? > > The battery is of minor value while the grid is up. Without the > battery, I would be buying about 10kwh per night and paying about > $.10/kwh. Then, during the day, selling back at about $.06/kwh. So, > the net benefit of the battery in my situation is probably less than > $1/day. Certainly less than $2. It WOULD take me far longer than the > life of the battery paying for it at less than $1/day. > > Since the utility is willing to pay cash for over production, I may well > have an unusually good deal. > > I bought the PowerWall primarily for grid down security but find it > useful for a little day/night savings. > > > You have described a PowerWall. The battery is one or more units that > >> will supply or charge 5kw and holds 13-14kwh. If about 11kwh will carry > >> you over night and if you don't use more than 5kw over night, a single > >> battery unit will serve you. With good sun, day time self power use can > >> be around 20kw, including car charging. > >> > >> In 5 or so months, I have bought less than 10kwh from my utility and > >> sold them something like 10,000 kwh. That is with one battery unit. > >> > >> Cost installed was about $13k. For smooth operation, I am highly > >> dependent on the utility to accept my excess power. > _______________________________________________ > 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/20190713/fe80d0c9/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)
