flash890
Posts: 1
Joined: Mon Sep 09, 2019 5:52 pm
Delivery Date: 18 Mar 2019

Newby charging question

Mon Sep 09, 2019 6:29 pm

I couldn't find this question on the site anywhere but maybe I wasn't searching properly. Apologies if this is old news.

So here's the deal. We bought a 2019 Leaf SL with the 40KW battery. We wanted the 62KW battery but the dealer wanted $10k more for it for 75 miles ($133/mile). Crazy. Anyway, it is supposed to have a 150 mile range. Yet, when it has charged overnight it is never says 150 miles. It is usually in the high 150s to mid 160s. I once saw it say 172 miles. Is the charger killing the battery?

And that begs another question, is 100% really 100%? Is 0% really 0%? I have heard that Tesla never charges over 80% even though it says 100% and that it never goes below 20% even though is says 0. This to protect the battery. So is that true and what does the Leaf do?

We have put 7,700 miles on it since the middle of March. We both love the car and only drive the gas car when we need two cars or need to go a long distance. We are wondering how it will handle a Minnesota winter. Fortunately we have some options.

Thanks in advance for your wise council.

PS: As it has turned out 150 miles has been just fine. We rarely use half of that and have only been as low as 20% a handful of times.

LeftieBiker
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Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Newby charging question

Mon Sep 09, 2019 9:53 pm

The range estimator is commonly referred to as the "Guess O Meter" because it relies mainly on driving data from the last few minutes before the car was parked last - not from any actual (and impossible) knowledge of how far or how fast you will be driving next. So no, the full charge isn't an over-charge, although it is better for a lithium battery to not be left sitting at 100% indicated charge for many hours, especially in hot weather. The range estimator has actually improved from past versions, but is still only making a semi-educated guess.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

cwerdna
Posts: 9762
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Newby charging question

Mon Sep 09, 2019 10:00 pm

Battery capacity is measured in kWh, not "KW".

Yep on the guess-o-meter aka GOM. It sucks. Ignore it.
flash890 wrote:
Mon Sep 09, 2019 6:29 pm
I have heard that Tesla never charges over 80% even though it says 100% and that it never goes below 20% even though is says 0.
Not true.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

LeftieBiker
Moderator
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Joined: Wed May 22, 2013 3:17 am
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Location: Upstate New York, US

Re: Newby charging question

Mon Sep 09, 2019 10:16 pm

cwerdna wrote:
Mon Sep 09, 2019 10:00 pm
Battery capacity is measured in kWh, not "KW".

Yep on the guess-o-meter aka GOM. It sucks. Ignore it.
flash890 wrote:
Mon Sep 09, 2019 6:29 pm
I have heard that Tesla never charges over 80% even though it says 100% and that it never goes below 20% even though is says 0.
Not true.
The above sounds like the Prius charging algorithm. Toyota programs the Prius BMS to keep the SOC between 20% and 80% to preserve the NiMH battery.

Oh, and the 2018+ GOM is actually quite a bit better than the previous versions. I suspect that it uses some averaged data from further back than the last few minutes, but that's only my guess, as it were...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

User avatar
Nubo
Posts: 5406
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Newby charging question

Mon Sep 09, 2019 10:25 pm

flash890 wrote:
Mon Sep 09, 2019 6:29 pm
And that begs another question, is 100% really 100%? Is 0% really 0%? I have heard that Tesla never charges over 80% even though it says 100% and that it never goes below 20% even though is says 0. This to protect the battery. So is that true and what does the Leaf do?
State of charge percentage is a somewhat arbitrary construct. If you want to find the absolute 100%, charge until the battery shows visible damage or bursts into flames. Everything else is an engineering compromise to balance safety, longevity and utility.
I noticed you're still working with polymers.

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