Tango130
Established Member
Yes, see post #8Why have you change the thread title, someone been speaking with you?
Yes, see post #8Why have you change the thread title, someone been speaking with you?
Yes - but the old title did get the car looked at friday afternoon as a priority from the dealer in question, so renamed the thead as they been nice. But still not a resolved issue until I can get the battery closer to 455v when 100%.Why have you change the thread title, someone been speaking with you?
Seems like a plan.Yes - but the old title did get the car looked at friday afternoon as a priority from the dealer in question, so renamed the thead as they been nice. But still not a resolved issue until I can get the battery closer to 455v when 100%.
I'm planning on going to the furthest Tesco I can legally can on monday morning, and doing everthing they say to do not do in the eco driving manual so get the lowest miles/kw I can achieve to get the most electricity out of the battery to try to rebalance it again.
From what I hear, you should have 455 volts after a full charge after the latest update IF.Perhaps Mg have lowered the full charge voltage to 450v in order to speed up the balance charge, but allowed it to go 5v lower into the bottom buffer end of the battery, resulting in the same actual usable capacity?
Did you manage to do this? Have you tried rebalancing it again?Yes - but the old title did get the car looked at friday afternoon as a priority from the dealer in question, so renamed the thead as they been nice. But still not a resolved issue until I can get the battery closer to 455v when 100%.
I'm planning on going to the furthest Tesco I can legally can on monday morning, and doing everthing they say to do not do in the eco driving manual so get the lowest miles/kw I can achieve to get the most electricity out of the battery to try to rebalance it again.
What would be the reasoning for them to lower the top voltage?Finished rebalanced last night - 449v. No improvement since last time. But havnt got worse. Cant do any more test for time being.
Took 5 hours to balance.
The question is, has MG lowered the top voltage in this BMS update?
Dont know why for sure. Battery protection? Different software bug? I only ask as I know someone else who had the update and they are getting the same 449v.What would be the reasoning for them to lower the top voltage?
I think that you make some very good points. The whole BMS thing has developed into an intoxicating mix of variants and opinions. For example my car;Hi All,
Please are these statements true or false?
Just will like to know what we all understand about balancing and the state general of the MG Dealerships
1. MG ZS EV and most EVs in general are designed to do a balancing charges only after a specific number of non- balancing charges (15-25) or during a recharge that follows a nearly complete or full discharge of the HVB.
2. If the battery is connected to power supply and charges to full but the BMS analyser controls do not indicate a balancing charge is required then a balancing charge will not occur no matter how long the EV remains connected to a power source
3. Balancing is subject to all the same physical and material limitations of any battery so temperature and several other factors will affect the power load and voltage and it will be impossible to always achieve one fix voltage after a very single balancing charge.
4. MG ZS EV HVB fuse update relates to high voltage DC charger protection for the MG BMS and HVB and in principle has little to do with balancing charging.
5. While acknowledging the very very poor level of EV knowledge and service at some of the GM dealerships, the average EV user also has very limited knowledge of the technology that goes into running of EVs. We therefore are completely at the mercy of the manufacturer. The dealerships like us are all learning about EVs so customer and dealerships should support eachother and have confidence that the manufacturer will not deliberately put systems into the EV that will but us at risk and that should anything be discovered that puts us at risk it will be promptly corrected.
So which of the above statements are true or false for you?
I agree in part but how is the software to be tested in real life if not with owners? Just reading through the threads on here there are so many different situations and combinations that cannot be tested on paper and need to applied to see how they impact on these. It's not like they are starting with everyone in the same situation.I find it odd that they’re not on top of this. The car has been out for over a year and they still don’t have a handle on these updates.
Surely it’s up to each individual garage that has had a Zs Ev in and had an update to keep a record of which one. Then, they should contact each owner to advise them that an update is needed ONCE it’s clear it works, not use the owners as some sort of beta testers for their systems.
You'd think that with MG using a digital service record system, it shouldn't be too much of a stretch to have that sort of info recorded during the update.I find it odd that they’re not on top of this. The car has been out for over a year and they still don’t have a handle on these updates.
Surely it’s up to each individual garage that has had a Zs Ev in and had an update to keep a record of which one. Then, they should contact each owner to advise them that an update is needed ONCE it’s clear it works, not use the owners as some sort of beta testers for their systems.
It’s a complete mess to be honest.I think that you make some very good points. The whole BMS thing has developed into an intoxicating mix of variants and opinions. For example my car;
1/takes a timed charge (setting wall box to switch on at a particular time with cable plugged in and car locked starts charging).
2/it won’t AC charge when unlocked 3/it has the ‘comfort2’ update that shows range and outside temperature.
3/a full charge shows 455v But, I’m told it needs the latest Jan21 BMS update?
I have always been of the opinion with software that it’s almost always better to be on the latest update - however, with obtuse and overly complex versioning and no definitive software version numbers to work to, that I can see, this becomes almost impossible to track and manage. No wonder dealers are struggling. If for example MG were able to say the latest update was version 2021.1.0 then we could all work to a benchmark. This feels like a transition period to a software era that is still in it’s infancy. For example whilst Tesla are by no means perfect - they are predominately a software company making cars. Totally different from a car company trying to produce software.
MG have a system all linked to VIN. I believe it is called the dealership Bulletin or something similar name. It has all the updates and the update numbers and which VIN numbers need which updates. Unfortunately several dealerships seem unable to use this system properly. Except for Chorley Group dealerships which seem to have a 100% correct interphase the general impression here in the UK is that the dealerships just are unable to use the system. I do not know why.linked to the vin number....cant go wrong then.