Also keep in mind, the smaller you make the 12v, the more it will be deep-cycled, thus shortening it's life.
In many cases putting a larger amp-hour battery in makes it last longer, so depending on how much extra $ the larger battery is, it may be better for your wallet (not to mention the hassle of having to deal with a EOL battery, usually at the worst possible time when it's cold and wet.) On Fri, Feb 12, 2021 at 11:19 AM Lee Hart via EV <[email protected]> wrote: > Lawrence Rhodes via EV wrote: > > Even a Yellow Top is the wrong battery for the job in your Leaf. It too > > is optimized for engine starting. But it does have enough amphour > > capacity to also support the large number of "always-on" computer loads > > in modern cars that will run down the batter in a few weeks if you don't > > have a high enough amphour capacity. > > If 41 lead acid amp hours is adequate for a Leaf how many LiPO amp hours > do you need? > > 41 amphours, if you want it to power all the vampire loads for weeks if > the car has to sit. > > You can only cut back on the amphours if you are willing to shorten the > length of time the car can sit without being used. > > > If I knew how much a Leaf used daily I could calculate the proper sized > > battery for as many months unused a Leaf has to endure. > > Yes. It's not too hard a measurement to make, either. Put an ammeter in > one of the battery leads. Check it several times while the car sits to > get an idea of the average current (it wouldn't surprise me if there are > some loads that cycle on/off on some schedule). > > > Since LiPO performs better than lead then a smaller battery should work > > LiPO performs better at high currents. At low currents, both lead and > lithium will deliver essentially all their rated amphour capacity. > Lead-acids may even do better, since the capacity is usually specified > at the "20-hour" rate, and discharging over many weeks is far slower. > > > however the smart thing to do as with an ICE... simply use a battery > > tender or fully charge every few weeks from external sources... maybe > > a little solar panel in the windshield some Leafs have it built in. > > Yes. In fact, I added a small PV panel to our Prius for exactly this > reason. Its 12v battery only lasts about 3 weeks if the car isn't > driven. That occasionally happened, when the car was left at the airport > when we went on vacation, etc. The PV panel completely eliminated the > problem. > > Lee Hart > > -- > In the mood for a great New Year's story? Here is my > abridged version of Charles Dickens classic "The Chimes" > <http://www.sunrise-ev.com/poems/thechimes.htm> > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210212/db5a0b20/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
