JoeS
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Re: I-MiEV owner - Portugal

Sun Sep 11, 2016 7:38 am

Malm, thank you for the Turtle analyses. Does that mean that Turtle can pop up even though there are some bars left on the fuel gauge?

I'm afraid that my approach to battery longevity is a bit more conservative than yours, as in over 75,000 miles amongst our three i-MiEVs we've never seen Turtle, rarely go above 14 bars, and almost never go below two bars.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

Malm
Posts: 447
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: I-MiEV owner - Portugal

Sun Sep 11, 2016 9:06 am

Yes, turtle can certainly pop up with some bars left.

It happened to me in 2013, when it was getting its capacity wrong. With 1 bar it could show turtle for a second and after few meters it would stop without energy. But that will happen to very few i-MiEV owners, because usually the car recalibrates its remaining capacity from time to time. Just when the battery suffers an high rate of degradation is a short period of time (8% lost in 3 months, because of extreme hot conditions and frequent use at high speeds, for example), this can happen.

I´m not the only one that saw this:

hkbob123 - "Hello everyone, I am come from Hong Kong ,my iMiEV is right hand drive HA3W. I have a critical issue that my car apear "turtle" light while the battery status still have 2 bar flashing,I still keep low speed driving then become "battery logo" light and shut down after 200 meter drive,anyone know that issue related to battery or emu program?Thank you very much!"
viewtopic.php?f=23&t=2834

Rosacastillon - "The vehicle has indicated overly optimistic mileage that has resulted in my wife being stranded once, at midnight." viewtopic.php?f=23&t=2648&p=23169#p23169

With Rosacastillion, I believe the car was stopping with some bars in the gauge, and a high value of mRR (that's how I understand - "indicated overly optimistic mileage"). He doesn´t say it, but I believe the car showed turtle some seconds before stopping.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Malm
Posts: 447
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: I-MiEV owner - Portugal

Sun Sep 11, 2016 9:23 am

I agree avoiding going under 20%. It will be certainly good to the battery. I just do it because its the way to know how much my turtle values, and that gives me hints how the degradation is evolving. If I didn´t do this type of discharges, at least once an year, how could I know if I have turtle, and how much miles can I do with it? Just gives other security to know how things are at low SoC.

I usually charge to 100%. Well, just let it charge until it stops. I see many times that it says 100% SoC in the end, but cell voltages are not as high as they should be. Some times it shows 100% SoC but only 4,08V in the cells (and not the 4,105V that we should expect). On the other end, i-MiEV cells, I believe, could charge up to 4,2V. I saw sometimes my cells charging to something like 4,13V, when I travel downhill after a full charge. So, I believe the car has its protections to high voltage in the cells, so I keep that work with it. What I don´t keep with it is the temperature control, it simply doesn´t do it unless at a quick charge.
Last edited by Malm on Sun Sep 11, 2016 9:37 am, edited 1 time in total.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Malm
Posts: 447
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: I-MiEV owner - Portugal

Sun Sep 11, 2016 9:34 am

With the fight against degradation centered in temperature control (and very little in other things), I believe capacity loss went down to a value arround 2,5% an year (in the last 2 and an half years). That is fantastic because between 2011 and 2014 it was arround 6%/year.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Malm
Posts: 447
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: I-MiEV owner - Portugal

Sat Jan 07, 2017 4:19 pm

Image

Variation of battery current capacity, values obtained from the car, with MUT-III and EvBatMon, in 2016. I believe a good management of pack temperature is the main reason for this incredible low loss of capacity in 2016. It was an hot 2016 summer, but with AC cold air going down to the pack when temperatures were going up, that wasn´t any more a problem. Only less 0.6 Ah between 1/1/2016 and 31/12/2016. And today still 33,4 Ah.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Malm
Posts: 447
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: I-MiEV owner - Portugal

Sat Feb 18, 2017 8:41 am

Today was the day.

Image

Image

Image
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Don
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Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: I-MiEV owner - Portugal

Sat Feb 18, 2017 8:53 am

Congratulations!!

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1994 Miata 60K miles - Soon to be sold
1979 Honda CBX six into six

JoeS
Site Moderator
Posts: 3148
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: I-MiEV owner - Portugal

Sat Feb 18, 2017 11:38 am

Malm wrote:Today was the day....
Congratulations also! 100,000km = 62,137.119 miles. Had me worried with your opening remark, as I was afraid something bad had happened with that dashboard warning showing.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

sandange
Posts: 820
Joined: Thu Jul 05, 2012 2:21 am
Location: Quebec, Canada
Contact: Website

Re: I-MiEV owner - Portugal

Sun Feb 19, 2017 4:59 pm

Congratulations, 100,000 km is definitely a landmark achievement.
Just recently hit this mark.
With no problems.
:D
Puey Bluey 2014 Miev
76,400 miles, 123,000 km
Previous EVs
Blackie - 2012 ES Miev 2 years - 67,000 km / (41,630 miles)
Total Electric miles driven
118,000, (190,000 km)

DonDakin
Posts: 375
Joined: Wed Aug 15, 2012 7:10 pm

Re: I-MiEV owner - Portugal

Tue Feb 21, 2017 3:09 pm

Congratz Malm

I should be there also in a few years.....

Don

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