One thing I haven’t seen mentioned is power outage. If the grid goes down with net metering so does you solar.
You have to be off-grid to stay powered when the grid fails. Sent from my iPhone > On Jul 14, 2019, at 11:16 AM, Robert Bruninga via EV <ev@lists.evdl.org> > wrote: > > But why are you so determined to use batteies when the cost of grid power > is ditrt cheap. > > a 1kwh deep cycle lead acid battery might cost $100. It will store 10 > cents of electricity per day. > After one year it is SHOT. that is $100/365 days or about 27 cents per > kWh. So you are paying TRIPLE the cost of electricity just for a battery > compared to just getting it from the grid? And this does not even mention > the cost of solar panels. This is purely battery storage costs. > > Even if you find magic battteries that can do 1000 discharges before > replacement, that still is 10 cents per kWh storage cost and still does not > even count the cost of solar to get the energy inthe first place. > > AND, unless you do a full cycle of thebattery everyday, to use y our > incoming solar, then you are not fully using your array.investment. Sure > you can throw away all kinds of money at this problem, but nothing canbeat > being grid-tied and a net meter. Just do it. Do a small system at > contractor prices... then add panels at your leisure and at 20% of the cost. > > bob > On Sun, Jul 14, 2019 at 10:50 AM Peri Hartman via EV <ev@lists.evdl.org> > wrote: > >> Actually, I am proposing something simpler than a power wall - that does >> not feed back to the grid. Maybe that simplification doesn't reduce the >> cost of the battery system much, but it would reduce the legal paper >> work down to a normal electrical permit. >> >> Peri >> >> ------ Original Message ------ >> From: "Willie via EV" <ev@lists.evdl.org> >> To: ev@lists.evdl.org >> Cc: "Willie" <wmckem...@gmail.com> >> Sent: 14-Jul-19 7:30:58 AM >> Subject: Re: [EVDL] Solar off grid with an EV? (transformers) >> >>> >>> >>>> On 7/14/19 9:06 AM, Peri Hartman via EV 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. >>> >>> 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) >>> >> >> _______________________________________________ >> 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/20190714/9cbd7158/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)
