Post your MG ZS EV battery SOH data please

[JodyS21]

I'm going to try to pull together some data regarding battery State Of Health, we now have cars about that have done a reasonable mileage.

These are the bits that I think would be good to know:
SOH %
Mileage done
Car age (since registered)
Rought percentage of DC (Rapid) charges vs AC charges.
How many times do you think you've charged to 100%
GOM shown in Normal(3) after a 100% charge, with both trips reset (car started without brake pedal pressed/under no load) (this gives a good indication of SOH if you haven't got access to OBD2 data)

Mine, to start things off:
SOH 97.27%
10.5k miles
7 months old
5% Rapid charging (5 Rapids done, about 100 AC charges)
About 84 charges to 100%
GOM 159miles

 

[aleks57]

SOH 99.9%
18800 km
from 10.06.2020
0% Rapid charging, about 70 AC charges
About 65 charges to 100%
GOM 263 km, battery charged and balanced
SOC 92.8%
delta cell 20mV
BMS 0210622EU1

 

[rbpasapera]

SOH 100.00%
11k km
13 months old manufactured car, 10 months of ownership.
35% Rapid charging
All AC charges to 100%
GOM 263 km
SOC BMS 93-ish % and 450-ish volts, car fully charged and balanced

 

[chowbenter]

I think I'm slacking way behind you guys

SOH = 100%

Mileage = 507 miles

Rapid charging = Never

Car Age = 7 months

Charge to 100% = Twice

GOM = 162 miles

 

[Lobogris]

I think I'm slacking way behind you guys

SOH = 100%

Mileage = 507 miles

Rapid charging = Never

Car Age = 7 months

Charge to 100% = Twice

GOM = 162 miles

Isn’t the SoH shown for the 12V battery here?
Where can we see the data for the HV battery SOH?

 

[chowbenter]

Isn’t the SoH shown for the 12V battery here?
Where can we see the data for the HV battery SOH?

No that's not for the 12v battery, The 100% is for the SOH of the main battery pack, this grid template is made up of ten separate windows, I forgot to put a border around each data window in the settings, I'll do that next time I connect the OBD reader.

 

[Lovemyev]

SOH - I have no means of measuring.
Mileage - Almost 14,000 miles.
Car registered - 6th Jan 2020 ( about 18 months old ) .
Rapid charges - 4 splash and dash charges only.
Charged to 100% - More recent after receiving BMS update, but only about 10 - 15%.
Present GOM reading after a full charge & balance - 155 / 156 miles ( trips reset / Default mode ).

 

[chowbenter]

I think I'm slacking way behind you guys

SOH = 100%

Mileage = 507 miles

Rapid charging = Never

Car Age = 7 months

Charge to 100% = Twice

GOM = 162 miles

I had another play around with the OBD scanner this morning & put borders around the ten data windows.

 

[JodyS21]

Well, this is what I have so far. I've made calculated assumptions where needed.

I can't really see much of a pattern so far! Except to say living in a hot country looks like it may help SOH...

edit: moved spreadsheet to first post.

 

[GeoffNewport]

Hi @JodyS21 (and thanks for doing this)
Data for the MG ZS EV only 25 weeks old (27/2) as follows;
Fast charge approx 10 times in this period
Overnight charging to full 5 x per week = 125 full cycles

 

[JodyS21]

Hi @JodyS21 (and thanks for doing this)
Data for the MG ZS EV only 25 weeks old (27/2) as follows;
Fast charge approx 10 times in this period
Overnight charging to full 5 x per week = 125 full cycles
View attachment 4486

Fantastic data thanks

 

[JodyS21]

Hi @JodyS21 (and thanks for doing this)
Data for the MG ZS EV only 25 weeks old (27/2) as follows;
Fast charge approx 10 times in this period
Overnight charging to full 5 x per week = 125 full cycles
View attachment 4486

[ Spreadsheet now updated and moved into the 1st post of this thread]

It's really interesting seeing your data.
I need to convince my wife (who's the one that uses the car 99% of the time) to keep our tablet with the app on in the car & then use it all the time to get proper data over time.

A small side point, it's interesting that your voltage is over 450v with the "latest" bms, averaging almost 451.75-452.0V. Pretty much everyone else (12of12 UK cars data I have) top out between 448.25-450.25v. You do have a different build of the BMS in AUS to UK, but I wonder if it is more temperature related as you'd think they'd have also set the same new voltage limits/buffer.

A few more months and another 5,000 miles or so, and yours & mine will show if the rate of SOH decline continues (I hope not!).

 

[Mark Holmes]

Hi there,
Driven 22500 miles
SOH 95.5
GOM shown 157
Car bought March 2020
Has been rapid charged about 12 times, but mainly charged on 7 KWh charging, and home charging occasionally.

 

[miko]

Unfortunatly tonight I went to charging station and it shows
SOH 99,56%
14.687 km
Dc/AC 60/40%
Car registered 11/2020

 

[GeoffNewport]

It's really interesting seeing your data.
I need to convince my wife (who's the one that uses the car 99% of the time) to keep our tablet with the app on in the car & then use it all the time to get proper data over time.

A small side point, it's interesting that your voltage is over 450v with the "latest" bms, averaging almost 451.75-452.0V. Pretty much everyone else (12of12 UK cars data I have) top out between 448.25-450.25v. You do have a different build of the BMS in AUS to UK, but I wonder if it is more temperature related as you'd think they'd have also set the same new voltage limits/buffer.

Thanks @JodyS21 l have the OBD2 port permanently in the car and an old Samsung phone with the Mobile App v1.2.1 As for voltage, l was concerned when we picked the car up as other new owners in Aus complained about their voltage and mileage falling the more they drove. After the update, and each time the charge was taken to 100% including allowing the car to balance (happens after 94%) then its stayed healthy ever since. As for temp, we are in winter currently as you can see very low temps at 10 degrees (chilly for some)
Happy to send the excel file (would not attach) which includes more data (also data captured at low state of charge) as the screen shot above only showed monthly grabs only. Hope this helps others
Cheers

 

[Lobogris]

Here is my data taken from the service centre computer. The SOH is apparently at 100 percent (seen in bottom right of the picture) after 18 months and 12,000 miles.

 

[michaelgaunt]

Ok. Only done 160km bringing the car back from the dealer and pottering about.
soh:100%
voltage: post charge: 451.5
cell max: 4.184
cell min: 4.17

Weirdest reading is SoC: 94% but car is fully charged and shows 260km on GOM.

 

[Gomev]

Ok. Only done 160km bringing the car back from the dealer and pottering about.
soh:100%
voltage: post charge: 451.5
cell max: 4.184
cell min: 4.17

Weirdest reading is SoC: 94% but car is fully charged and shows 260km on GOM.

That's the upper level buffer. The BMS restricts actual, real SOC to max c.93/94 % whilst showing as 100% in car.
If the car were to ever show 0% the lower buffer real SOC would be c. 3%

 

[michaelgaunt]

That's the upper level buffer. The BMS restricts actual, real SOC to max c.93/94 % whilst showing as 100% in car.
If the car were to ever show 0% the lower buffer real SOC would be c. 3%

Thanks for explaining this. makes Sense.

 

[Alan5]

SOH - 98.16%
Milage - 13259 miles.
Coming up to 2 years old.
Rapid charging about 15% of AC Charging I only AC charge using granny charger at the moment .They are about to fit five 7 kw chargers at work ? so will be using them soon and as I am the only person with an EV will be spoilt for choice ?.
I rarely charge to 100% unless I am going on a long journey or for testing purposes but around 20 times.
GOM 161 miles everything reset in normal mode , EV watchdog showing full charge at 98.5% and showing the battery pack at 41.2 kwh .
BMS 0210622EU1