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Discussion Starter · #1 · (Edited)
Has anyone managed to get the equalisation time back to normal after the latest update and 449v?

If not does anyone know if this is a permanent issue now? (I've read of people after the volt issues getting back up to the new 449v but they are all reporting longer than standard balance times still)

Has anyone who's had the update thaking their volts to 449v but who didnt previously did not have the volt/range issues noticed an increase in equalisation times?
 

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Nope. Not tried. But I have an excuse.... I moved just after I got it back up to 449V and I haven’t yet had a home charger fitted. Should be next Friday. Having a Zappi to integrate with my solar I have just had fitted.

I’ve been relying on local rapid chargers since then, but we have hardly done any mileage since we moved & I broke my leg, so I’ve not been working.
 
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Has anyone who's had the update thaking their volts to 449v but who didnt previously did not have the volt/range issues noticed an increase in equalisation times?
Yes - Is the simple answer.
I was not affected by the "Buggy" software and was running fine on the original OEM software.
But the car went in for it's first service and the drivers door wiring loom recall.
As a result, the car spent 3 days at the agents and refused to boot up after the work was carried out.
The problem had to be remotely fixed by MG Tech staff.
As a result, they where told to apply the latest software updates to my car in an attempt to resolve the problem.
This was part and parcel of the fix over 3 days !.
Prior to receiving the Jan 15th update, my car would take about 1 - 2 hours to perform a balance cycle.
Now, a balance can take about 4 hours to complete AFTER the car has hit 100% fully charged.
The voltage on the pack after a full charge now, is bouncing between 449 & 450 Volts.
The predicted mileage range on the GOM in default "Normal" mode, with everything turned off, is around the 160 ish mile mark.
This is with the trips reset to zero, before fully booting up the car with your foot depressed on the foot brake of course.
Lock down restrictions have prevented numerous full charge / balance cycles.
Yes - but the balance time has increased after the BMS update I find.
This I am told, will reduce as the pack recovers but after saying that, I don't believe my pack was every affected by the "Buggy" software anyway, because it never received it !.
I has to be said that prior to the update, I would not carry out full charge / balance cycles every single time I needed to add some range to the car though.
Usually I would charge to about 80% ish if I was only carrying out local trips.
If I had a long trip to make, then of course I would full charge to the point when the car would turn off the wall box.
The car drives fine and the consumption feels about right.
I am seeing about 4.0 m/kwh at the moment.
 

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Discussion Starter · #5 ·
Carty,

This is what I am hearing from everyone else also on other channels, the equalisation hasn't recovered and those that didn't have the major bug have been hit with an increase in equalisation charge time.

So there was an update to fix the bug of slow equalisation, this then caused an issue with volts/range, so there was an update to fix the volt/range issues which has again created an issue with equalisation 😆 I could understand if it was only in vehicles that had the volt/range issues but this clearly isn't this case, there is obviously still problems.
 

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I would be very interested in update reports Carty. I too had the pre-duff BMS as I said elsewhere as my Excite was updated at its first annual service on 23rd October, the day before the duff BMS update was released. I assume therefore I have the June 2020 BMS software.

The car is working well with 456V consistently reported after a full charge. Range at full is 157 miles in Normal mode. Balancing takes about 2 ½ to 3 hours, longer than before the June 2020 update. My ZS EV is not going anywhere near any dealers' update computer until this settles down!

Please keep us updated in relation to any reduction in your balancing times Carty.

Your last paragraph sums up the situation perfectly Maxit! 🤣
 
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I would be very interested in update reports Carty. I too had the pre-duff BMS as I said elsewhere as my Excite was updated at its first annual service on 23rd October, the day before the duff BMS update was released. I assume therefore I have the June 2020 BMS software.

The car is working well with 456V consistently reported after a full charge. Range at full is 157 miles in Normal mode. Balancing takes about 2 ½ to 3 hours, longer than before the June 2020 update. My ZS EV is not going anywhere near any dealers' update computer until this settles down!

Please keep us updated in relation to any reduction in your balancing times Carty.

Your last paragraph sums up the situation perfectly Maxit! 🤣
Hi @RicM.
Sorry for the delay in replying to this request.
I have been generally just charging to a SOC that suit our needs over the last few weeks.
Then I spotted you post, so I thought I would carry out a full charge and balance today !.
So, in short the balance cycle started at 9.00pm and it completed ( as close as I could gauge ) at 12.30am.
Therefore 3.5 hours to complete the balance cycle.
Better than the first balance cycle that I did after the BMS update, which took almost forever !.
At 3.5 hours, this is still longer than it use to take on the previous OEM software.
Balancing on the OEM software, would take between 1 and 1.5 hours to complete.
So, I am still seeing longer balancing time scales right, with the new 15th Jan 2021 BMS update applied.
I think this time scale could be reduced, by carrying out more & more balancing cycles.
But, to be honest I am just a little concerned that we could be just chasing a "unicorn" and causing more problems than we are curing, to the life span of our HV battery packs here ???.
Do I feel there is a difference "Pre / Post" updtate ?.
Yes - The balance process does take more time, that is for certain.
But, I have to say that I never been a big fan of charging the HV pack to 100% full every single time, in oder to cover only a few miles the following day.
I prefer the SOC charge, to suit my needs for the forth coming days ahead.
The car appears to perform fine and reports ( what I consider ) to be pretty good returns.
The consumption tends to be a "One On One" situation, when it comes to mileage covered, to the mileage used from the GOM.
Over the last few weeks, I have been returning around 4.1 M/kwh efficiency on a 100 mile trip, and it has done this a number of times now.
Similar length of trip, but different destinations as well.
I never like running the range down REALLY low, but when the running the OLD software, the amber range warning light would display at around 35 - 37 miles mark on the GOM.
A couple of times when running low on charge over the last few weeks, the amber warning would display at around 34 - 36 miles of remaining range left on the GOM.
So, it is pretty similar to the original display on the OEM software with this regard.
I would say in conclusion, that the only thing I have really noticed from PRE to POST update, is the increased balancing time.
Although it is better than it first was after the update, it is NOT as quick to balance as the original OEM software was pre update.
I still feel it takes WAY longer than it previously did, without an doubt !.
Hope this answers your question ( ish ).
 

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I had the bad BMS and a voltage of 437v and voltage imbalance of 0.2v Dealer rebalanced for me (it took 8 days) as I felt it was MG's responsibility to sort out the fault of their bad code which they has installed in my car. Car now has latest BMS and indicates 449v. Equalisation only takes a couple of hours every 2 weeks with a voltage imbalance of approximately on each occasion 0.018v.

So no more problems.
144376
 

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Thanks for your report Carty. My last balance charge a couple of days ago was 3 hours. When I first got the car in November 2019 balancing took between 30 and 45 minutes. I'm sticking with the June 2020 BMS as it appears that there is no reduction in balancing time with the latest BMS.

The question is also would the latest BMS be better for battery life with the reduced top end voltage of 449/450V rather than my 456V? There are reports of better regeneration when the battery is almost full. Perhaps at the next service in November there may be an even better BMS available.

I think I will continue to wait and see as the car is running well.
 

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I had the bad BMS and a voltage of 437v and voltage imbalance of 0.2v Dealer rebalanced for me (it took 8 days) as I felt it was MG's responsibility to sort out the fault of their bad code which they has installed in my car. Car now has latest BMS and indicates 449v. Equalisation only takes a couple of hours every 2 weeks with a voltage imbalance of approximately on each occasion 0.018v.

So no more problems. View attachment 144376
Can I ask how you produced that table of data? What hardware and software are you using?
 

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First you need an OBD II dongle to plug into the cars computer port. Then you need the following software available here, and a Bluetooth capable phone. The software is extensive allowing access to voltages, BMS software version etc.

Link to software download page.

Project OBD2 - Mobile App v1.2.1/

I bought the Bluetooth OBD II dongle on Amazon as this one works with the software, not all do.
144408


 

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Thanks. I'm going to be away for a little while, but will look into this when we return.

First holiday in teh ZS! Yippee"
 

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My car has been in for the latest bms update and I’m so happy.

my GOM has changed from 208 to 160!! Interested to see if it is adaptive now.

my equalisation time is now 2 1/2 hours, much better than 8 hours+

Volts on full is 450. Is this the new normal?
 
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