Malm
Posts: 449
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: EVBatMon Readings

Tue Aug 23, 2016 1:08 am

No one more saw SoC over 100%?
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

Phximiev
Posts: 1187
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Location: Phoenix

Re: EVBatMon Readings

Tue Aug 23, 2016 9:50 am

That is a good point and the answer is?
2012 iMIEV ES
2014 Chevy Volt

zzcoopej
Posts: 64
Joined: Wed Jul 08, 2015 7:23 pm
Location: Gosford, Australia
Contact: Website

Re: EVBatMon Readings

Tue Aug 23, 2016 2:24 pm

Malm wrote:No one more saw SoC over 100%?


I'm not quite sure what you mean, are you questioning a SoC reading of over 100%? If so, I think the reason Mitsubishi sometimes report 102% etc is so their calculations still start from around 100% a few hours after charging has finished. SoC can drop 3-4% in the first 24 hours.

EvBatMon App for iMiEV/C-Zéro/iOn
Android https://play.google.com/store/apps/details?id=com.EvPositive.EvBatMon_iMiEV
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www.EvPositive.com

Malm
Posts: 449
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: EVBatMon Readings

Tue Aug 23, 2016 4:32 pm

Real SoC is over 100%. That doesn´t make any sense. Neither going there because after a few hours it will go lower. If that was the case, why not doing it all the time?

This is what I think is the answer. The car estimates a number for its current battery capacity. My i-MiEV established that the actual capacity is 34 Ah. So, for my car, 34 Ah is 100% SoC. But the current battery capacity is not a stable number (depends on temperature, maybe with other things), and not decreases always at the same rate, so it can be a little (sometimes not so little) wrong in this difficult task of evaluating battery capacity. In the day that I took that EVBatMon screenshot, the real current battery capacity was 34,6 Ah (and not the 34 Ah that it assumed to be 100% SoC capacity). When it was charging, voltages where not at maximum when it reached the 34 Ah (and so the 100% SoC), so it charged more, until cells went to values near de 4,105 V (the maximum voltage that the i-MiEV allows in its cells when charging). When the charge ended, the energy in the battery was 34,6 Ah. If 34 is 100%, then 34,6 is... 101,7%.

So, the 102% results of an incorrect judgement of its real current battery capacity, when the car is working with a value that is under the real one. Sometimes, the car makes a correction of its current battery capacity, maybe my car should make one, geting close do 34,6 Ah.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

PV1
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Contact: Website

Re: EVBatMon Readings

Fri Sep 23, 2016 8:14 am

I returned from my Ohio trip and did a full charge from 2 bars. Battery capacity is now 45.4 Ah :D (was 45.1 Ah at the last calibration charge). That ought to make the 7 Springs trip easier.
Last edited by PV1 on Sat Sep 24, 2016 4:08 am, edited 1 time in total.
Reason: Correction, 45.4 Ah, not 45.7. Sorry.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013

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

"Photon" - 2017 Bolt EV LT in Orange with QC - 7/31/2017

Solar-powered since 10/10/2013

JoeS
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Location: Los Altos Hills, California

Re: EVBatMon Readings

Fri Sep 23, 2016 10:33 am

PV1 wrote:I returned from my Ohio trip and did a full charge from 2 bars. Battery capacity is now 45.7 Ah :D (was 45.1 Ah at the last calibration charge). That ought to make the 7 Springs trip easier.
Dang, it just keeps getting better with age! PV1, do you have a chronological list of the readings you obtained - perhaps temperature is a significant variable?
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

PV1
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Re: EVBatMon Readings

Fri Sep 23, 2016 11:06 am

I've been using this thread as a record. Going back through, here's what I have:

Code: Select all

April 8, 2016       43.2 Ah   First started using EVBatMon
April 9, 2016       43.1 Ah
April 14, 2016      43.1 Ah   Calibration charge, remained 43.1 Ah
May 21, 2016        42.8 Ah   Steady drop to 42.8 Ah
May 25, 2016        43.7 Ah   3 bars to full
June 22, 2016       44.4 Ah   Calibration charge
July 13, 2016       45.1 Ah   Calibration charge (I remember that day, it was hot)
September 23, 2016  45.4 Ah   Calibration charge


There may be some temperature correlation, but most of these readings were taken in similar environments. Last night's calibration charge may have had battery temperatures up a bit, but nothing crazy (ambient temps topped out at 84 F, battery is currently 78 F).

***EDIT*** I goofed. It says 45.4 Ah capacity, not 45.7 Ah. Sorry for the excitement. Posts have been updated.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013

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

"Photon" - 2017 Bolt EV LT in Orange with QC - 7/31/2017

Solar-powered since 10/10/2013

mdbuilder
Posts: 227
Joined: Wed May 18, 2016 6:05 am
Location: Great Mills, Md.

Re: EVBatMon Readings

Sat Sep 24, 2016 7:22 am

I saw your report yesterday so I figured I'd do the same. I had a fairly intensive driving day with a trip for breakfast, one for a medical appoint with my son in the morning then to work and back in the afternoon. Still had 7 bars left so when I went out foe takeout for dinner I drove really fast and ran the A/C on max even though it wasn't needed :).

Still, there were 4 bars so after dinner I hit the gas station (needed to hit the atm!) and ran the HEAT. Once in the garage still at 3 bars another 15 minutes or so with max heated defrost took it down to 2 bars :).

This morning I checked Evbatmon and it shows 40.6Ah which is 1.0 Ah higher than when I bought the car at the end of May for a 2.5% gain in capacity, I've now added 3,300 miles to the 11,244 it had at purchase FWIW...
2015 Nissan NV200
2012 I-Miev SE Premium
2009 Mazda 5
2017 Toyota Prius Prime

PV1
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Re: EVBatMon Readings

Mon Nov 07, 2016 3:06 pm

Might have been my car's deep sleep, but it now reports 46.1 Ah!

The deep sleep I'm referring to is that Bear totally drained the 12 volt battery (3.8 volts per my meter) over the weekend. I just revived it.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013

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

"Photon" - 2017 Bolt EV LT in Orange with QC - 7/31/2017

Solar-powered since 10/10/2013

mdbuilder
Posts: 227
Joined: Wed May 18, 2016 6:05 am
Location: Great Mills, Md.

Re: EVBatMon Readings

Mon Nov 07, 2016 3:40 pm

Sounds good, how many actual miles do you get with the 45+ ah?

Mine has dropped .1 to 40.5. I am up to just under 5k miles since the end of May. Last weekend my son and I did 62 miles of mostly 50-55 mph highway driving, range meter flashing @4 pulling into the drive way.
2015 Nissan NV200
2012 I-Miev SE Premium
2009 Mazda 5
2017 Toyota Prius Prime

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