Post your MG ZS EV battery SOH data please

[JodyS21]

Is this Vmin - Vmax from one of the 9 CMU’s?
You have the BMS software which reduces HV voltage to 449V instead of 455V?
4,23 V is based on a 455 V battery pack (455 : 108)
This should getting lower after equalizing.
BTW 50 mV cell difference is nothing to worry about, MG claims 100 mV is allowed.

The 100mV thing from MG, was I believe, just the cut off figure for the faulty BMS issue, they were supposed to keep the car and balance it at the dealer until it was within this amount.

 

[JodyS21]

I seem to have a pack with one high cell.
The high cell (MU04) reads 4.23V, the rest are all 4.18-4.19V.

Your battery does seem to be a bit of an anomaly @Kithmo ….

 

[Kithmo]

Is this Vmin - Vmax from one of the 9 CMU’s?
You have the BMS software which reduces HV voltage to 449V instead of 455V?
4,23 V is based on a 455 V battery pack (455 : 108)
This should getting lower after equalizing.
BTW 50 mV cell difference is nothing to worry about, MG claims 100 mV is allowed.

I do have the old BMS, reads 456.25V when fully charged.
The 50mV difference is playing havoc with my OCD though.

 

[JodyS21]

@JodyS21

My SOH started dropping below 100% only quite recently, I went back to this thread to learn more.

Looks like timing (mileage) of the first drop varies, but then it quite quickly approaches ~95%. I haven't seen anyone's post that is significantly below. How did your car go in the last 6 months since you first posted this?

I've finally got around to plugging in the OBD2.

We now have a GOM of 155 miles (N3) at full charge/reset etc.
The SoH is 95.04%
Mileage is 24k. 15months old.
(93% real SoC, 449.75V, Min/Max cell 4.148/4.168)

 

[Lovemyev]

I've finally got around to plugging in the OBD2.

We now have a GOM of 155 miles (N3) at full charge/reset etc.
The SoH is 95.04%
Mileage is 24k. 15months old.
(93% real SoC, 449.75V, Min/Max cell 4.148/4.168)

These figures / results are pretty close to figures I have seen on our Gen 1 model !.
Just over two years old, almost 20,000 miles covered.
As you know, no access via a OBD dongle at my end.
99.9% of or charging needs where done at home, on a 7kw wall box.
It would be interesting to compare results from owners with similar mileage covered / age of the car, that is running on the original soft ware BMS versions ???.
What do you think @JodyS21 ????.
Some battery degradation has taken place then ?????.

 

[rbpasapera]

Today, I charged mine on AC from 29% to 100% with 30.2 kWh consumed. After doing some math this means that the usable battery capacity is 42.5 kWh, but if the battery SOH is 95.7% after 19 months of ownership and 21k km, should it be less than the original 42.5 kWh?

 

[rpannell]

Today, I charged mine on AC from 29% to 100% with 30.2 kWh consumed. After doing some math this means that the usable battery capacity is 42.5 kWh, but if the battery SOH is 95.7% after 19 months of ownership and 21k km, should it be less than the original 42.5 kWh?

The 42.5 kWh assumes 0% loss in the AC charging system. The actual loss is probably closer to 10-15% meaning that the battery capacity will be 10-15% less than the 42.5kWh that you calculate.

 

[JodyS21]

The 42.5 kWh assumes 0% loss in the AC charging system. The actual loss is probably closer to 10-15% meaning that the battery capacity will be 10-15% less than the 42.5kWh that you calculate.

Exactly what I was about to say!

 

[Runnerarne]

3 days ago my battery dropped to 99.0% after 8 months and 11316 km. Have never used Fast charger, and usually charged to around 80%, but balanced 1 or twice every month.

 

[rbpasapera]

The 42.5 kWh assumes 0% loss in the AC charging system. The actual loss is probably closer to 10-15% meaning that the battery capacity will be 10-15% less than the 42.5kWh that you calculate.

Yes I agree, on AC charging the car pulls 6.3 kW of the wallbox 6.9 kW, that means 40-ish kWh battery capacity, but I have been getting this value even with the SOH at 100%.

 

[aleks57]

Today I connected to OBDII and post screenshots. Car from 06/10/2020.

 

[Zoomy]

OVMS today following a balance charge.

I'm avoiding rapids wherever possible now because the damage to the SoH is tangible and real (in the region of 0.3-0.5% per charge to 80%)


OVMS# metrics list voltage
v.b.12v.voltage 12.73V
v.b.12v.voltage.alert
v.b.12v.voltage.ref 12.71V
v.b.c.voltage
v.b.c.voltage.alert
v.b.c.voltage.dev.max
v.b.c.voltage.max 4.1595,4.163,4.163,4.161,4.164,4.158,4.163,4.165,4.163V
v.b.c.voltage.min 4.153,4.153,4.155,4.15,4.154,4.151,4.155,4.155,4.147V
v.b.p.voltage.avg
v.b.p.voltage.grad
v.b.p.voltage.max 4.165V
v.b.p.voltage.min 4.147V
v.b.p.voltage.stddev
v.b.p.voltage.stddev.max
v.b.voltage 449V
v.c.12v.voltage
v.c.voltage 231V
v.g.voltage
xmg.v.bat.voltage.bms 449V
xmg.v.bat.voltage.vcu 449V
xmg.v.bms.cell.voltage.max 4.165V
xmg.v.bms.cell.voltage.min 4.147V
xmg.v.vcu.dcdc.input.voltage 452V
xmg.v.vcu.dcdc.output.voltage 13.2V
OVMS# metrics list odo
v.p.odometer 35106km
I (4292339109) webserver: HTTP POST /api/execute
I (4292339119) webcommand: HttpCommandStream[0x3f8b6ee8]: 3488708 bytes free, executing: metrics list odo
I (4292345159) webserver: HTTP POST /api/execute
OVMS# metrics list soc
v.b.soc 99.4536%
v.c.duration.soc 0Min
v.c.limit.soc
v.g.duration.soc
v.g.limit.soc
xmg.v.soc.raw 93.5%
I (4292345169) webcommand: HttpCommandStream[0x3f8b4644]: 3488268 bytes free, executing: metrics list soc
I (4292349519) webserver: HTTP POST /api/execute
OVMS# metrics list soh
v.b.soh 93.48%
I (4292349519) webcommand: HttpCommandStream[0x3f8b4658]: 3488268 bytes free, executing: metrics list soh

 

[Runnerarne]

Today 98,37 SOH after 11777 km and almost 10 months from i get the car from the dealer. No fast charging, and most 40% to 80% cyckle. I feels like the SOH are dropping fast down now.

 

[rbpasapera]

Today 98,37 SOH after 11777 km and almost 10 months from i get the car from the dealer. No fast charging, and most 40% to 80% cyckle. I feels like the SOH are dropping fast down now.

So it's ok to rapid charge the ZS EV and charge it to 100%, I've done that since day 1 of ownership, SOH is 95.6% with 21k km on the clock, it's dropping slowly by 0.1% after reaching 96-ish%.

 

[Zoomy]

"OK" has to be qualified across more than your account. Your circumstance may be different somehow? I know the stock BMS barely showed a drop. A01/EU1 I assure you is not doing well. I suspect all these moans about slow charging forced the hands of the engineers to do something less protective.

 

[rbpasapera]

"OK" has to be qualified across more than your account. Your circumstance may be different somehow? I know the stock BMS barely showed a drop. A01/EU1 I assure you is not doing well. I suspect all these moans about slow charging forced the hands of the engineers to do something less protective.

Car received the A01 update in Jan 21 and the EU1 update in Oct 21.

 

[gonzoB]

Sydney, Aus, SOH 99.6%, 12000km, 12 months old. A few 50kW charges on trips, but mostly charged at home from ~30% to full with balancing on 7kw unit.

Gonzo

 

[RamseyLewis]

Hello, how do you get this information ? i'm looking on the forum but beside torque (which doesnt work on my zs, I don't know why) there is no indication on the software used. Some of you are using a phone app when other are on windows ? thanks in advance

 

[N2STY]

Hello, how do you get this information ? i'm looking on the forum but beside torque (which doesnt work on my zs, I don't know why) there is no indication on the software used. Some of you are using a phone app when other are on windows ? thanks in advance

Don't think there is anything for the MK2 yet

 

[gonzoB]

I used Torque Pro with an Autohil adapter and these PIDs:

GitHub - peternixon/MG-EV-OBD-PID: PID file for MG ZS EV suitable for use with Torque Pro

PID file for MG ZS EV suitable for use with Torque Pro - peternixon/MG-EV-OBD-PID

github.com

Gonzo