25/01/21: Just had latest BMS software. Observations...

[rbpasapera]

Reading what you guys have said about the newest software is making me contemplate whether it's worth risking it in my car.
It's due to be updated tomorrow, but as far as I'm aware I don't have the crappy BMS update of October. I collected it new 20th December and asked for the latest BMS update to be carried out at PDI - however I still can't charge unlocked so assumed it wasn't done.

I've just taken it off charge and the pic below shows the Voltage and range:

I never had problems with the BMS, I was getting 457v and 179mi Eco/163mi Normal, after new BMS update I got 450v and the same 179mi Eco/163mi Normal, so I wouldn't be worried about voltage because range is what matters.

 

[MAS]

Stronger regen would be nice. My car gets the latest update tomorrow

I have not noticed any difference in regen after the update

 

[MAS]

I never had problems with the BMS, I was getting 457v and 163mi Eco/179mi Normal, after new BMS update I got 450v and the same 163mi Eco/179mi Normal, so I wouldn't be worried about voltage because range is what matters.

Eco mode mileage should be more than Normal mode?

 

[rbpasapera]

Eco mode mileage should be more than Normal mode?

Yes you're right, I've just edited it.

 

[Chrisb]

Don't forget that they can alter the top voltage and bottom voltage, so they can knock 5 volts off the top, but allowed it to go 5 volts lower at the bottom buffer end if that makes sense, resulting in the same useable capacity, but we won't know until people compare the lower voltages aswell, I wouldn't assume that just because they've lowered the top voltage there's less useable capacity in the battery. They may have also done this to help preserve battery life, so it may be necessary for the warranty?

 

[jamesie]

As I understand it there are two ways. OVMS or MG service laptop.

 

[Phil Hayward]

Does anybody know the voltage the low battery comes on with the various updates. I get 455V 170 miles on the meter after balancing without any of the updates. My dealer said I could have the BMS update but it is not needed for battery health? unlocked slow charging not needed by me.

 

[aleks57]

Привет, кто-нибудь знает, сколько ячеек последовательно соединены в основной батарее MG ZS EV?

 

[Cocijo]

I have no idea. Why do you ask?

 

[aleks57]

I have no idea. Why do you ask?

you can actually calculate how many kW the battery gives out

 

[Cocijo]

Ok. I think that it’s how this is managed that’s causing concern. I’m pretty sure if you were to add up all the face value rated output of the cells they would total what was expected - however, the amount of usable capacity is managed for safety and longevity - this is at the heart of the debate around BMS

 

[Paul225]

So I had the first service done today. The garage also applied the latest BMS update along with the HV fuse protection update.

My car hasn't had any previous BMS updates after the comfort 2 earlier this year, so this may, or may not, be relevant.

Anyway, unlike the previous BMS updates, reported by others on here, the car only commences AC charging once locked, and stops when you unlock. It won't slow charge unlocked! The only other thing I've noticed is if you do unlock the car whilst charging, it takes a few seconds longer to turn off the charging, before it was almost instant.

I'll be interested to see if others can still AC charge unlocked after the latest BMS update.

I'll report back on the final voltage after charging fully tomorrow, until now my car has shown 453v.

First year service today - will report back later !!

 

[Freddy]

Just for info.
Taken this morning, no BMS update.

 

[Gomev]

I've never seen those first 2 images on my dashboard ! at least I don't think so.

 

[SCB86]

I've never seen figures that high in my month old ZS!

 

[shikoku14]

This must be the Essex spec BMS @Mark Holmes you have similar numbers don't you?

 

[Jeps]

View attachment 1228View attachment 1229View attachment 1230View attachment 1231Just for info.
Taken this morning, no BMS update.

Good numbers... But how far can you go in a charge, especially in winter time?

 

[Cocijo]

View attachment 1228View attachment 1229View attachment 1230View attachment 1231Just for info.
Taken this morning, no BMS update.

What m/kwh do you normally average - that’s the key factor!

 

[Jeps]

I've never seen those first 2 images on my dashboard ! at least I don't think so.

Flick the "Mode" button in the center console if it is the Eco and Sport mode you have never seen!

 

[Mark Holmes]

This must be the Essex spec BMS @Mark Holmes you have similar numbers don't you?

Yes I do, very strange that it only happens to a few, was the update done at Glyn Hopkins East London?