> Absolutely never trickle charge any type of Lithium Ion battery Another absolute statement, that is meaningless unless the term "trickle charge" is defined.
Yes, "trickle charging" beyond FULL is absolutely bad. But there is nothing wrong with trickle charging at a low rate when the batteries are well below full. Bob, WB4APR Sent from my iPhone > On Jun 3, 2015, at 11:12 AM, Ben Goren via EV <ev@lists.evdl.org> wrote: > > Thanks, everybody, for all the advice. > > Sunday evening when I had dinner at their place, I set the car to only > charge to 80%. I also set the timer so that it'll finish charging by 6:00 > am, thinking that that was when their time-of-use plan kicked up to the > higher rate. They actually don't have a morning restriction, only an > afternoon one, so I'll probably change that to 8:00 am, so that any > charging will be a closer match for the coolest part of the day...it'll be > cooler at 8:00 am than 10:00 pm, with 6:00 am about as cool as it gets. > > One relevant question...they've only got the 110V charger with the car. > It's plenty for their actual charging needs...but the Nissan manual pretty > clearly says that Nissan doesn't recommend "trickle charging." Does > anybody know if that's a "you'll damage your pack if you always trickle > charge" recommendation, or if it's a "you'll die of frustration watching > paint dry in the time it takes to charge" recommendation? If the > latter...not a problem. A very, very long day of driving for them would be > 50 miles, and that'd easily go back in the battery overnight. The > former...would be worth getting something Dad can plug into the 220 outlet > in the garage. > > The garage has a not unreasonable amount of insulation...not ideal, but as > much as is practical. And there's a window A/C unit mounted in the wall > that they'll leave on when it's hot. > > A swamp cooler is out for the other reasons mentioned, and for the fact > that Dad does a lot of woodworking in the garage, and the big humidity > swings would be a problem. > > The Leaf is a bit bigger than the '55 VW Bug that previously lived in the > garage (and is now going to live in the carport), so Dad was busy making > room in there and backing in and out yesterday when I stopped by for a > minute. They haven't charged the car yet and it still has 40 miles on the > guess-o-meter. > > All in all, definitely a wise investment. Amortized over several years or > so, it's a net financial gain...and the money they used to pay for the car > was sitting in an account not doing anything. The month-to-month expenses > are going to be significantly less, so it'll feel to them like they've got > more money to play with. And they won't have to get gas, there's no > maintenance, and all the rest. And it's a really nice car to boot. > Probably the best thing they've done with their money since they paid off > their mortgage early. > > Thanks again, everybody, for all the advice! > > b& > >> On Jun 1, 2015, at 9:05 AM, Michael Ross via EV <ev@lists.evdl.org> >> wrote: >> >> In a phone conversation, Dr. Dahn told me that LFP starts >> deteriorating a 104°F when fully charged. >> >> You can simply not charge fully. Exactly how not fully? I don't know. >> Also there may be differences depending on the form factor, source of >> the electrode, electrolyte compositions, and so on. >> >> No rules of thumb here, but you may want to prudently reduce the >> charge cutoff voltage. The difference between 3.4V and 3.7 could be >> huge in terms of cell life, particularly if the pack gets hot when >> charged. >> >> This is complicated by the general rule not to ever, ever charge Li >> ion cells in your residence. >> >> Mike >> >>> On Mon, Jun 1, 2015 at 10:40 AM, tomw via EV <ev@lists.evdl.org> wrote: >>> >>> My garage is a steel building with no insulation. In summer it >>> typically is >>> 10 to 15 F warmer than outside temperature. You can feel the IR >>> radiation from the walls and roof, like being in an oven, and the >>> metal is hot to the touch. In June through August it is typically 100 >>> to 118 F inside. My ev >>> has been garaged there for 5 1/2 years, 40k+ miles. I live in high >>> desert >>> where the nights are typically 35 F lower than daytime highs, so the >>> highest temperature the battery reaches just sitting in the garage >>> is significantly below the daytime high temperature in the garage >>> since the cells have significant heat capacity and are in insulated >>> boxes. >>> >>> The pack has been up to 110 to 115 F a number of times in the hot >>> months after longer drives. Seems to just keep going. Each year I >>> do a test drive to discharge the pack to about 28% SoC, then floor >>> the accelerator to draw 3C from the pack and see if the LVC alarm on >>> the minibms triggers. So far it has not. Range likely has decreased >>> a bit, but this test indicates it has not decreased all that much. >>> My cells are LiFePO4, different than the Leaf, but according to Dahn >>> worse with regard to temperature effects, so I don't think you need >>> be too concerned. On the hottest days I sometimes park the car in >>> the shade of a tree rather than leave it in the garage. >>> >>> Winter brings the opposite problem, but I have Farnum heaters under >>> aluminum sheet that the batteries sit on and 1/2" insulation in the >>> boxes. Keeps them at the set point of 65 F in the winter when it is >>> plugged in in the garage and above 50F if left parked outside for 4 >>> - 5 hours. >>> >>> >>> >>> >>> >>> -- >>> View this message in context: >>> http://electric-vehicle-discussion-list.413529.n4.nabble.com/Success >>> -tp4675905p4675945.html Sent from the Electric Vehicle Discussion >>> List mailing list archive at Nabble.com. >>> _______________________________________________ >>> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >>> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >>> For EV drag racing discussion, please use NEDRA ( >>> http://groups.yahoo.com/group/NEDRA) >> >> >> -- >> To invent, you need a good imagination and a pile of junk. >> Thomas A. Edison >> <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> >> >> A public-opinion poll is no substitute for thought. >> *Warren Buffet* >> >> Michael E. Ross >> (919) 585-6737 Land >> (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google >> Phone >> (919) 631-1451 Cell >> >> michael.e.r...@gmail.com >> <michael.e.r...@gmail.com> >> -------------- next part -------------- An HTML attachment was >> scrubbed... >> URL: >> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150601/5 >> cb534fb/attachment.htm> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use 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 > For EV drag racing discussion, please use 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 For EV drag racing discussion, please use 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 For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
