PV1
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Re: Battery Capacity Testing

Fri May 01, 2015 6:03 am

I was about to suggest using CaniOn to measure energy consumption instead of a clamp on meter for the same reason. I don't believe the coolant pump is uncontrolled, at it seems to cycle on and off based on time, not temperature. It doesn't matter if it's 10 F or 80 F, my coolant pump cycles at the same rate. Still, CaniOn would be best to capture the energy consumption of everything (as it does measure in/out of the pack, not the system. Flashing the headlights while charging can be seen in the amperage reading of CaniOn.).

For the discharge test, how about using one of these on the 12 volt battery while in READY? It'd provide a steady load and wouldn't be as wasteful as running a space heater for hours. I have one and use it with a couple of 12 volt panels as overcharge protection (you know, 'cause a real charge controller is too simple :lol: :roll: ).

http://www.ebay.com/itm/400-Watt-Power- ... 0444131961
:idea: :idea: :idea: :!: :!:

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Aerowhatt
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Joined: Wed Jan 28, 2015 1:52 pm

Re: Battery Capacity Testing

Fri May 01, 2015 8:29 am

PV1 wrote: wouldn't be as wasteful as running a space heater for hours. I have one and use it with a couple of 12 volt panels as overcharge protection (you know, 'cause a real charge controller is too simple :lol: :roll: ).


Unless the space heater is helping to heat your home :D

Aerowhatt
2014 cool silver ES, acquired new 4/2015 (42.7ah at ~26K miles)
2014 Labrador Black Pearl ES, acquired new 3/2016 (41.5ah at ~15k miles)

PV1
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Re: Battery Capacity Testing

Fri May 01, 2015 12:40 pm

Good point. I guess my workplace is getting to me. Instead of requesting the house temperature raised, half of the floor is running space heaters :roll: :twisted: on top of the AC running.
:idea: :idea: :idea: :!: :!:

Dropbox maintenance in progress. If any of my links aren't working after November 17, please PM me and let me know which one isn't working.

Thanks.

Aerowhatt
Gold Member
Posts: 434
Joined: Wed Jan 28, 2015 1:52 pm

Re: Battery Capacity Testing

Fri May 01, 2015 8:58 pm

PV1 wrote:Good point. I guess my workplace is getting to me. Instead of requesting the house temperature raised, half of the floor is running space heaters :roll: :twisted: on top of the AC running.


Only in America!

Aerowhatt
2014 cool silver ES, acquired new 4/2015 (42.7ah at ~26K miles)
2014 Labrador Black Pearl ES, acquired new 3/2016 (41.5ah at ~15k miles)

JoeS
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Location: Los Altos Hills, California

Re: Battery Capacity Testing

Sun Jun 21, 2015 5:34 pm

kiev just posted this Dealer Capacity Calibration as a read-only Reference Technical Article. Just thought I'd keep things linked together so we can find them.

http://myimiev.com/forum/viewtopic.php?f=19&t=2675
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: 449
Joined: Mon Jul 22, 2013 12:16 pm
Location: Tábua - Portugal

Re: Battery only charging halfway

Wed Sep 30, 2015 6:50 am

I expected that Carsten. Cells going to 4,07V (if they are all at similar voltage) at 100% or 4,105V at 100% its normal and many times don't means anything about current capacity.

I usually follow, when have the opportunity, what it charges from 50% SoC to 55% SoC. I see, in mine, something like 545 Wh.

Image

I know measurements done on i-MiEVs that I believe still have a range of a new one, and they normally show a value of 620/625 Wh. If your i-MiEV charge that value then I believe it have the same range of a new one (to be sure you should see if you can go to 0,0% SoC with your car, or if at 5% SoC, cells are over of approximately 3,4V).

So, I believe my car has 545/625*100 = 87,2% of the range of a new one.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

RobbW
Posts: 417
Joined: Mon Jul 08, 2013 1:23 pm
Location: Elgin, IL

Re: Battery Capacity Testing

Wed Sep 30, 2015 9:32 am

PV1 wrote:I was about to suggest using CaniOn to measure energy consumption instead of a clamp on meter for the same reason. I don't believe the coolant pump is uncontrolled, at it seems to cycle on and off based on time, not temperature. It doesn't matter if it's 10 F or 80 F, my coolant pump cycles at the same rate. Still, CaniOn would be best to capture the energy consumption of everything (as it does measure in/out of the pack, not the system. Flashing the headlights while charging can be seen in the amperage reading of CaniOn.).

For the discharge test, how about using one of these on the 12 volt battery while in READY? It'd provide a steady load and wouldn't be as wasteful as running a space heater for hours. I have one and use it with a couple of 12 volt panels as overcharge protection (you know, 'cause a real charge controller is too simple :lol: :roll: ).

http://www.ebay.com/itm/400-Watt-Power- ... 0444131961


So, I was just about to post an off-topic reply to this post from PV1. But I decided to start my own topic over in the Off-Topic forum instead: viewtopic.php?f=13&t=2835
Clear Skies,
Robb

EV: 2012 Mitsubishi i-MiEV SE, Raspberry Metallic, Premium Package - Purchased 07/11/13
PHEV: 2017 Chrysler Pacifica eHybrid, Bright White, Platinum Package - Purchased 05/01/17

BlueLightning
Posts: 53
Joined: Sun Oct 14, 2012 11:59 am
Location: Normandy France
Contact: Website

Re: Battery Capacity Testing

Sun Dec 06, 2015 2:15 am

Red triangle points on this graph are showing me68’s cell 23 collapsing, blue and green triangle are me68 voltages values before the problem and after the change of cell.
ImageLowest Cell Voltage versus SoC by Blue I.ightning

Lowest cell voltage data are collected battery at rest.

If data are not collected battery at rest, then voltage becomes a function of amperage, and not of battery state.
Driving or heat on, higher is the amperage, lower is the voltage (1), so a battery shut down at 2.75 volt is there to avoid any damage to the lowest voltage cell.

Battery capacity will remain at its highest capacity if battery cells have the same voltage during charge or discharge.
So collecting the lowest cell voltage which must fit the red curve might be a more efficient way to check the state of health of the battery.
Red triangle points on this graph are showing me68’s cell 23 collapsing, blue and green triangle are me68 voltages values before the problem and after the change of cell.

At 23% SoC me68 had a battery shutdown “… 2,75V of cell 23, resulted in a shutdown of the battery from the Battery Management System, no matter which SoC was calculated” (4).
There was no “Turtle” warning before this shut down.
So Turtle is not voltage but SoC related and surprisingly a battery shut down is possible without warning, so again, thanks for Canion for providing us critical informations.

For a new battery, for a battery in a good State of Health, or recalibrated, Turtle will light up for some vehicles at 10.5 % of State of Charge and for other ones at 8.5 % SoC (2).
The battery will shut down for a 0% SoC (3). Malm with his “tricks”, heading now to a second earth circumference or 80 000 km, following the path of his ancestors, Magellan, Vasco Da Gama, and others, will show you irrational BMS behaviours (5).

(1) viewtopic.php?f=23&t=1789&p=17242&hilit=resistance+cell+battery#p17242
(2) https://forums.energymatters.com.au/alt ... tml#p44207
viewtopic.php?p=12122#p12122
viewtopic.php?p=12698#p12698
(3) http://www.vehiculeselectriques.fr/topi ... ml#p181035
(4) viewtopic.php?p=23489#p23489
(5) https://www.youtube.com/watch?v=PkWW5w2e4XU

kiev
Posts: 811
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Battery Capacity Testing

Sun Dec 06, 2015 7:05 am

très bien, blue lightning--great collection of data and graph, plus the finding about the turtle.
kiev = kenny's innovative electric vehicle

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

Re: Battery Capacity Testing

Sun Dec 06, 2015 4:26 pm

There are two results of my i-MiEV that are in the red line. That are the real results, without tricks. And two false results, one with the car giving less 10% of SoC then it had in the reality, and one giving more 5% of SoC then it had in the reality. By the way, my turtle come to light at 9,5% SoC. Allways, since 2011, at 9,5% SoC.
Riding an i-Miev since 4/2011 in Portugal, 100.000 kms.

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