True so let's define it Trickle charging means charging a fully charged battery under no-load at a rate equal to its self-discharge rate, thus enabling the battery to remain at its fully charged level.A battery under continuous float voltage charging is said to be under float-charging.
I would never do either one if these things to a Lithium Ion battery Sent from my iPhone On Jun 3, 2015, at 11:29 AM, Robert Bruninga via EV <ev@lists.evdl.org> wrote: >> 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) > -------------- next part -------------- An HTML attachment was scrubbed... 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