rbpasapera
Established Member
Yes it's after latest Jan update.Is it after the latest Jan update? I am only 449 after full charge and equalisation
Yes it's after latest Jan update.Is it after the latest Jan update? I am only 449 after full charge and equalisation
Mark, you are getting high Voltage because you have not got your BMS Jan 2021 update yet. I had a call from Glyn Hopkin Romford and wanted to book me in for MG recall for BMS update. I told her i have got mine done already on 25/01/2021, which she confirmed after speaking to MG East London. It seems they started to call from recent sales and working backward. She said they were sent VIN numbers from MG for BMS update recall.I only get 454 volts albeit I’m over 14000 miles in and so could have lost a little battery capacity.
Errr.... I said 443V, having just checkedHi @Mike .
I am a little surprised to see that before the BMS update, your voltage was around 433 volts and now after only one single charge you are now at 445 volts !.
Other owners are are struggling to get there voltage above 449 volts.
So, clearly there is inconsistencies here with no clear explanation why ???.
Given the usage and mileage on your car Mike, then the theory that 450 volts should be seen as the NEW norm.
Hi MAS mine still has the same BMS software from when I bought the car in March 20, the only update I had applied was the comfort 2. Mine is due in soon for the first service and I’m going to ask if the new BMS update needs to be applied as I’m happy with what I’ve got, but I don’t know what other benefits are meant to be achieved by having it.Mark, you are getting high Voltage because you have not got your BMS Jan 2021 update yet. I had a call from Glyn Hopkin Romford and wanted to book me in for MG recall for BMS update. I told her i have got mine done already on 25/01/2021, which she confirmed after speaking to MG East London. It seems they started to call from recent sales and working backward. She said they were sent VIN numbers from MG for BMS update recall.
Technicians and dealer dont seem to know much, other than going by directive form MG and getting paid for their labourHi MAS mine still has the same BMS software from when I bought the car in March 20, the only update I had applied was the comfort 2. Mine is due in soon for the first service and I’m going to ask if the new BMS update needs to be applied as I’m happy with what I’ve got, but I don’t know what other benefits are meant to be achieved by having it.
Hi MAS mine still has the same BMS software from when I bought the car in March 20, the only update I had applied was the comfort 2. Mine is due in soon for the first service and I’m going to ask if the new BMS update needs to be applied as I’m happy with what I’ve got, but I don’t know what other benefits are meant to be achieved by having it.
Car charged and balanced. Took less time than it did over the weekend, but rather than showing me 444v, it’s now showing 443v??So, just plugged in and I had 88% on the battery. Going to balance charge tonight and see whether my voltage increases higher than the 444v that I had on my last two charges
Pic below of the mileage and voltage when I plugged in.
View attachment 1312
As you have charged roughly about six times now ( A mixture of rapid and A/C I assume ) then the common voltage number of around 449 volts is a common factor here.So my observations following the latest BMS update on a car that was purchased in Jan 2020, and had the buggy October 2020 BMS installed on 2nd Nov 2020. Note I have driven around 600 miles since the Jan 2021 update was installed and have now completed balancing charges on I think 6 occasions:
These observations are subjective and may change as weather improves and I complete more driving and equalisation charges but perhaps provide a reference for others.
- Car now charges on AC even when unlocked
- Still seeing 449V when fully charged and everything off. Previously I was getting 454V
- Still taking several hours to complete balancing on a granny charger
- Range does not appear to have been unduly affected, and appears to have improved from what I was getting pre-Jan 2021 update. Car displays about 159 miles in N and 173 miles in E mode with everything off, in temperature of about 5 degrees. In reality I'm getting about 120 miles range driving sensibly with heating on in N. I could probably get 140 miles in cool temperatures if I was prepared to drive very carefully with minimal heating.
- Regen in level 3 feels slightly stronger than before
- Rapid charge speed may be slightly higher than before. I have yet to experience sub 30kw charge speeds since the update.
- Rapid charging now appears to taper down to about 15kw from 85% whereas it was 82% before update
All good points, but who really knows!!As you have charged roughly about six times now ( A mixture of rapid and A/C I assume ) then the common voltage number of around 449 volts is a common factor here.
The magical unicorn number of 455 volts appears not to be making itself known.
Nobody ( as of yet ) has seen any improvement on voltages above 450 is my understanding.
There is some speculation that 455 volts will only return ( if ever ) when the warmer weather returns, however I find it strange that “Pre Update” cars are still displaying 455 volts in the same weather conditions ?.
Question :- When cars are presented for their annual service, will they automatically get the latest BMS update, in order to standardise all cars to the same software condition ?.
Therefore we will all end up with 450 ish volts on the pack.
MG released a “HV Fuse Protection” update which all cars are going to receive at one point or another.
This was because there had been a couple of ZS EV’s that had suddenly just stopped because the HV fuse protecting the pack had failed.
Is this why they have reduced the voltage on the pack now down to 450 (ish) volts ?.
I have no idea - just guessing.
If there is any truth in this pure guess, then charging to full and balancing multiple times is never going to result in achieving the 455 volts we are all lead to believe we SHOULD be returning to ?????.
Is 450 volts the new 455 volts I wonder !.
Nobody - That’s the whole point !.All good points, but who really knows!!
Thank you for that information, that leaves me in very little doubt now.That's the main cause of confusion, Technician at the dealer don't seems to know or want to commit to a voltage figure that can be used as a benchmark. 449V is what I have got after BMS update for a new car with 200 miles driven.
I have undertaken 6 equalisation charges in addition to 4 rapid charges and 2 fast charges that didn't get to 100%. The battery has been down as low as 7% in this time so has had a good chance to get balanced.As you have charged roughly about six times now ( A mixture of rapid and A/C I assume ) then the common voltage number of around 449 volts is a common factor here.
The magical unicorn number of 455 volts appears not to be making itself known.
I think the magic number will be 450v, at least I'm getting the same mileage that I got before the BMS update.As you have charged roughly about six times now ( A mixture of rapid and A/C I assume ) then the common voltage number of around 449 volts is a common factor here.
The magical unicorn number of 455 volts appears not to be making itself known.
Nobody ( as of yet ) has seen any improvement on voltages above 450 is my understanding.
There is some speculation that 455 volts will only return ( if ever ) when the warmer weather returns, however I find it strange that “Pre Update” cars are still displaying 455 volts in the same weather conditions ?.
Question :- When cars are presented for their annual service, will they automatically get the latest BMS update, in order to standardise all cars to the same software condition ?.
Therefore we will all end up with 450 ish volts on the pack.
MG released a “HV Fuse Protection” update which all cars are going to receive at one point or another.
This was because there had been a couple of ZS EV’s that had suddenly just stopped because the HV fuse protecting the pack had failed.
Is this why they have reduced the voltage on the pack now down to 450 (ish) volts ?.
I have no idea - just guessing.
If there is any truth in this pure guess, then charging to full and balancing multiple times is never going to result in achieving the 455 volts we are all lead to believe we SHOULD be returning to ?????.
Is 450 volts the new 455 volts I wonder !.