PV1
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Posts: 2752
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA
Contact: Website

Re: EVBatMon Readings

Mon Nov 07, 2016 3:49 pm

The last three days of driving started out with 80-86 miles RR (while being cold enough to require pre-heating). The calibration charge that likely did it was a 65.1 mile drive with 0 bars and 3 miles RR left last Sunday.

The increase isn't significant enough to notice with 23 miles of driving daily outside of my starting RR.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

Driving electric since 2-21-2013.
3 years with the i-MiEV and loving every mile!

JoeS
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Posts: 2982
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: EVBatMon Readings

Mon Nov 07, 2016 5:03 pm

PV1 wrote:Might have been my car's deep sleep, but it now reports 46.1 Ah!...
:o Isn't that about the highest number anyone has seen? At this rate, you'll be over 50Ah by next May. :lol: Keep injecting that secret sauce!
EVs: 2 Wht/Blu SE Prem., '13 Tesla S85, 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

PV1
Site Moderator
Posts: 2752
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA
Contact: Website

Re: EVBatMon Readings

Tue Nov 08, 2016 3:55 am

I'd say it likes to be driven hard, but if that is what's doing it, you should be well ahead of me, Joe :lol: .

The last two miles are likely a factor. That includes a downhill slope with half-blue regen, followed by a bit of power, then nearly a mile of coasting. After coasting, regen from 50 MPH down to about 15 MPH to turn onto my road, power up a hill and regen down the other side, then crawl up the driveway.

I'm liking these LEV50n cells. Now if Koorz would have a battery issue so that pack could be swapped out. It took nearly a full charge to do 45 miles yesterday.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

Driving electric since 2-21-2013.
3 years with the i-MiEV and loving every mile!

Phximiev
Posts: 1005
Joined: Thu Jan 15, 2015 7:25 pm
Location: Phoenix

EVBatmon Readings

Sat Apr 08, 2017 11:07 am

We've taken our first EVBatmon reading:

Image

Is it correct to say that we have had 22% degradation?

This is after charging last night to "full".
2012 iMIEV ES

zzcoopej
Posts: 58
Joined: Wed Jul 08, 2015 7:23 pm
Location: Gosford, Australia
Contact: Website

Re: EVBatmon Readings

Sat Apr 08, 2017 8:34 pm

Phximiev wrote:Is it correct to say that we have had 22% degradation?


Correct, PMC = Percentage of Manufacturer's original Capacity, so 78% PMC = 22% degradation. This assumes the battery pack has been in the vehicle for a while as the BMU needs a good bit of data to calculate an accurate battery capacity. Discharging to <2 bars (flashing) from a full charge and then a slow level 1 full charge will usually give the BMU some good data on the state of your battery, otherwise the BMU is making too many assumptions.
Multiply the Ah capacity by the pack voltage (330V) and you get kWh. http://www.evpositive.com/battery-history.html (that is for the PHEV which has a different pack voltage, otherwise all other comments are applicable)

EvBatMon App for iMiEV/C-Zéro/iOn
Android https://play.google.com/store/apps/details?id=com.EvPositive.EvBatMon_iMiEV
iOS (iPhone,iPad,iPod) https://itunes.apple.com/us/app/evbatmon-for-mitsubishi-imiev/id1143905475
www.EvPositive.com

Phximiev
Posts: 1005
Joined: Thu Jan 15, 2015 7:25 pm
Location: Phoenix

Re: EVBatmon Readings

Sun Apr 09, 2017 7:43 am

zzcoopej wrote:
Phximiev wrote:Is it correct to say that we have had 22% degradation?


Correct, PMC = Percentage of Manufacturer's original Capacity, so 78% PMC = 22% degradation. This assumes the battery pack has been in the vehicle for a while as the BMU needs a good bit of data to calculate an accurate battery capacity. Discharging to <2 bars (flashing) from a full charge and then a slow level 1 full charge will usually give the BMU some good data on the state of your battery, otherwise the BMU is making too many assumptions.
Multiply the Ah capacity by the pack voltage (330V) and you get kWh. http://www.evpositive.com/battery-history.html (that is for the PHEV which has a different pack voltage, otherwise all other comments are applicable)


Mark Mitsubishi installed a new pack on or about December 30, 2014, so 2 1/2 years or so. What I will do is run the pack down to < 2 bars today and take another reading. 22% degradation seems high but then perhaps its the effect of the Phoenix heat over two summers?
2012 iMIEV ES

JoeS
Site Moderator
Posts: 2982
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: EVBatMon Readings

Mon Apr 10, 2017 2:26 pm

Phximiev, I moved those three posts over here, as the thread had basically the same title. We have two EVBatMon threads:

For the App itself -
http://myimiev.com/forum/viewtopic.php?f=25&t=3022

For discussions of the EVBatMon readings (this one) -
http://myimiev.com/forum/viewtopic.php?f=23&t=3056

I wouldn't worry about putting a number on the percentage degradation. While driving conservatively, if you still get about RR=32 miles with the fuel gauge at 8 bars, you're ok. Yes, in your climate I would not charge the battery over about 12 bars unless it was just before taking a longer trip.
EVs: 2 Wht/Blu SE Prem., '13 Tesla S85, 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

Phximiev
Posts: 1005
Joined: Thu Jan 15, 2015 7:25 pm
Location: Phoenix

Re: EVBatmon Readings

Wed Apr 12, 2017 7:23 am

Phximiev wrote:We've taken our first EVBatmon reading:

Image

Is it correct to say that we have had 22% degradation?

This is after charging last night to "full".


Second reading after taking the battery to one bar and fully recharging last night:

Image

The owner’s manual (around page I-4) states that we should have no more than 20% loss after 5 years. We received a new battery on or about December 30, 2014, so the battery is less than 2.5 years old and which presumably contains the LEV50N cells (which are not supposed to grade less than 90% after 700 cycles in 45 degrees C). Maybe they didn't install the 50Ns? Or if they did then the 50Ns have a problem with the Phoenix heat?

Time to call the dealer.
2012 iMIEV ES

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

Re: EVBatMon Readings

Wed Apr 12, 2017 8:27 am

"The owner’s manual (around page I-4) states that we should have no more than 20% loss after 5 years." Is that loss of battery capacity or loss of range? 22% loss of capacity doesn´t mean 22% loss of range. This is because when new the car will let use only a percentage of total capacity, but with time it will increase that percentage, and after some time, we can use all the capacity available. In my experience, with 22% loss of capacity, the range will only decrease something like 15%.

Some owners even saw an increase in range after sometime, because of that. It happened to me and that is because I'm one of the rarest that could get 175 mRR.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Phximiev
Posts: 1005
Joined: Thu Jan 15, 2015 7:25 pm
Location: Phoenix

Re: EVBatMon Readings

Wed Apr 12, 2017 9:40 am

Malm wrote:"The owner’s manual (around page I-4) states that we should have no more than 20% loss after 5 years." Is that loss of battery capacity or loss of range? 22% loss of capacity doesn´t mean 22% loss of range. This is because when new the car will let use only a percentage of total capacity, but with time it will increase that percentage, and after some time, we can use all the capacity available. In my experience, with 22% loss of capacity, the range will only decrease something like 15%.

Some owners even saw an increase in range after sometime, because of that. It happened to me and that is because I'm one of the rarest that could get 175 mRR.


The manual (I-4 and I-5) says loss of capacity rather than range.
2012 iMIEV ES

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