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

[Jeps]

Oh, and now my car is showing as 444v on a full charge?

Is that lower then before?

 

[Smendon]

Is that lower then before?

Yeah, it was showing lower than it was when I balance charged it last week. That was showing as 450v

 

[notdodgy]

Has anyone come across this scenario?

I set my Ohme charger to charge the car to 100%. I checked the car this morning and it was equalising.

I then checked the car again and the lodge was off, so I assumed it had finished the process but my charger was still saying it was charging?! I unlocked the car so I could see the state of charge and then locked it, and the MG light came on again to show it was equalising again?

I had the BMS update yesterday morning.

Your charging scenario sounds similar to my experience. I am also using Ohme cable.

Yesterday was my first time trying to use the Ohme for balancing. Set it on full charge.
I had a message from Ohme saying not charging as expected. Light was on solid and the Ohme box was showing 1.4 amps.

6 hours later the light was still on but Ohme schedule ended. I restarted it and went to bed.

Balancing took longer than I expected - I don't know if or when it finished.

Good news is battery now shows 450v in E /449V in N.

Not having a timed tariff and the MG not having an API means all I can do with the Ohme cable is schedule addition of a number of miles or select full charge.

 

[Jeps]

Yeah, it was showing lower than it was when I balance charged it last week. That was showing as 450v

I never checked how the voltage was before the update. The first charge showed 446v. I will check again when I unplug. My charger is not a smart charger, so it just do it's thing

 

[shikoku14]

I had the BMS update yesterday morning.

Your charging scenario sounds similar to my experience. I am also using Ohme cable.

Yesterday was my first time trying to use the Ohme for balancing. Set it on full charge.
I had a message from Ohme saying not charging as expected. Light was on solid and the Ohme box was showing 1.4 amps.

6 hours later the light was still on but Ohme schedule ended. I restarted it and went to bed.

Balancing took longer than I expected - I don't know if or when it finished.

Good news is battery now shows 450v in E /449V in N.

Not having a timed tariff and the MG not having an API means all I can do with the Ohme cable is schedule addition of a number of miles or select full charge.

Another thing you can do with Ohme is go into the app dashboard once the timer job has finished (but the car is still plugged in) and set it to max charge to continue with the equilization phase (that’s what I do with mine when it finishes it’s 5 hour ago faster window)

 

[Smendon]

I went for a drive and dropped the battery to 92%. I’ve put it back into charge to equalise and see what voltage I get

 

[Lovemyev]

I am now attempting my first charge after receiving the update on the 15th Jan.
Here is my observations for anybody willing to pass comment please !.
Prior to commencing the charge, the HV pack is now displaying a voltage of 411 volts with everything switched OFF.
The GOM is showing 92 miles of range, so this would suggest that charging to full around 160 ish miles ( at about 25 miles of range per hour on a wall box ) should only take about 3 hours in normal circumstances.
Before starting I have checked if the car will charge with the doors unlocked and YES it will.
It has never done this before, so something has clearly changed here.
I put the car on charge on my dumb 32 Amp Rolec wall box at 11.30am.
When I returned to the house and checked my EDF supplied energy monitor, my current usage was only displaying 3.931 kw of power being consumed ?.
I would expect this to be showing over 7.0 kw at this point, I have never witnessed this before ?.
The monitor is always very responsive and instant with no lag, when you turn something ON it appears as a value pretty much straight away.
IF - The wall box is only pulling just under 4.0kw ( and I have no idea why ) then it is not going to hit that predicted finish time !.
Therefore extending any charging time length by almost twice the time scale surely.
Has anybody else witnessed this situation.
Is this the reason why our cars are taking SO long to charge, then balance ?????.
Unless you have a way of monitoring what the car is pulling, you would have no idea.
I will post back later on my findings.
Edit:- After pondering this a little more now, I ( like a few others ) are not in the habit of putting our cars back on charge, when we still have 92 miles of range left !.
So with the SOC of the pack already being so high, it will almost instantly throttle back the rate of charge into the car !.
That follows what Miles R. suggested when he said :- To speed up the time scale to return your pack to the expected 455 volts by the balancing process, put the car back on charge when you have only consumed a few miles from the pack, it will then only allow a slow rate of charge back into the car.
Or words fairly close to this.

 

[Mike]

First rapid charge after BMS update, noticed it’s faster to reach 90% SOC, before update mine started to throttle at 8O%-ish, now it starts to throttle at 90%.

Interesting... we need more information from other owners to confirm this.

Am I right in thinking that there is no way to tell what software updates you’ve had on the car?
I called my dealer this morning about the software update. They said after my last service, 11/01/21, that my car was up to date but I thought the BMS update wasn’t available until the week after?

I did a full charge last weekend and it showed as 450v. The charge took about 18 hours, including equalisation, but that was on a granny charger.

I can tell using OVMS. I know what my previous versions were so can compare them.

According to what I saw on the MG EV weekly webcast, it's nothing to do with a VIN number.
It totally depends on when each car was last updated and therefore what version of the software it has installed.
They'll plug in it and it'll check versions in car against latest on MGs servers, and tell them what updates are available to perform.

It is to do with VIN. MG know what cars have or haven’t been updated. I had mine checked the other day to confirm it needs the update by giving them the VIN.

I did not charge my car since BMS update on 25/01/2021, because I had full battery. I plugged in yesterday at Pod point 22kw charger, cable was plugged in but was not charging, until I locked the car. Charging did continue when open the lock. Battery charge was 70% and in 26 minutes only got 2.3 KWh added, when the temperature was 9. I thought it should have given more charge for 22KWH charger? Previous charge before battery update, I would get near enough 7kwh for an hr charge at 7KWH even even when the temp was 1.

As mentioned elsewhere, the maximum AC the MG can charge at is 6.6kW from a 7kW or higher power charger.
(The maximum DC is around 80kW)

I just had my second charge after the BMS update.
Is any of you experiencing the same as me!
The car is reporting on the info screen that the charge is stopped at 100%. The car has so far been plugged in for 14 hours, I started at 42% and been charging at 10A. The weird thing is that the wallbox seems still to deliver current to the car, I don't have a meter on the wallbox but it still blinks like it is charging.
The MG badge is constantly glowing no impulse glowing like normal.
All this also happened on the first charging.
Is there still some equalisation balancing going on with the Battery???

Glowing means the car is doing an equalisation charge. This bit is the section that will need 50-100 hours to get back approx 10V missing from 445-455V (or whatever the new pack full voltage is now).
The equalisation bit will be lots of 1+ hours on the end of having been fully charged and waiting for the solid glow of the MG badge to stop glowing.

 

[Smendon]

At 92% my car was pulling just over 6kw when I plugged it in, but I did go for a drive which warmed up the battery a bit.

 

[Lovemyev]

At 92% my car was pulling just over 6kw when I plugged it in, but I did go for a drive which warmed up the battery a bit.

Bit of a quick update !.
The car has now been on charge for two hours ( time now 1.30pm )
The MG logo is still pulsing slowly, so is STIILL charging, not in balance mode yet !.
When pressing the button on the drivers door ( keys out off range of the car ) the dash displays the following info.
The car is at 81% SOC and 120 miles of range.
The estimated time left remaining is 2 hours 40 mins.
I will continue charging until the car stops the wall box.
At this rate it is likely to take about 4 hours to go from 92 miles of range to full.
I don't know what this figure is likely to be yet of course.
I know one thing, that is WAY to long in my book.
My energy monitor is still only showing just under 4.0 kw of charge entering the car though ?.
So, the car has only accepted 28 miles of range in two hours.
On a 7.0kw wall box, the car should ( and did ) accept about 25 miles of range for each and every hour spent on charge.
Clearly, it would appear that the car is only accepting the stated consumption rate by the energy monitor.
At a charge rate of just under 4.0 kw the car it is going to take almost twice the time to charge now.
Owners that complain ( and rightfully so ) that there cars are taking SO long to charge and balance, is this the reason ?.
Next time you charge on your 7 kw wall box, if you have an energy meter, just check what your car is accepting as a charge rate when the rest of the house is mainly pulling very little.
The car is regulating the charge, not the wall box.
Before I started this first test, I predicted ( by past use over the last twelve months ) that this process should have taken between 2.5 and 3.00 to complete.
At 7kw this would have been achievable, ( ish ) - but not at just under 4.00kw thats for sure !.

 

[Jeps]

I just checked the car. It has finished the balancing charge after what I guess was 17-18 hours from when I plugged it in to all was done. I charged at 10A and started with 42% SOC.

 

[Jeps]

Forgot to mention the voltage showed 447A last time it was 446A.

 

[rbpasapera]

Intersecting... we need more information from other owners to confirm this.

When DC charging mine dropped from 36-ish KW to 18-ish KW at 81%, after BMS update it does this at 90%, hope other owners could confirm this.

 

[Smendon]

Forgot to mention the voltage showed 447A last time it was 446A.

So it looks like yours is increasing then, so will get better

 

[Lovemyev]

I just checked the car. It has finished the balancing charge after what I guess was 17-18 hours from when I plugged it in to all was done. I charged at 10A and started with 42% SOC.

Is a charge / balance time of 17 - 18 hours really practical though ?.
450V not Amps, just saying.

 

[Jeps]

Is a charge / balance time of 17 - 18 hours really practical though ?.
450V not Amps, just saying.

My mistake, voltage not Amps ?. The balancing time is really long now. Before I usually charged overnight and the complete process was done when I was going to use the car. But now!!?

 

[Lovemyev]

I am seeing the very same thing.
At 3.30pm it was reporting 96% charged, with 147 miles of range and STILL charging with the MG logo still flashing !.
Just rechecked at 4.45pm and the car is reporting 100% charge is complete, with 154 miles of range.
The MG logo is now at a solid state ( not flashing ) but the wall box is still providing power to the car.
I have checked my home energy monitor and the car is now pulling 572 kw.
This would indicate that given the power consumption, it is still balancing the pack.
God knows how long this is likely to take !.
I will keep checking and report back.

 

[SCB86]

The pod point was still showing charging despite my car saying it was 100% full and the badge was extinguished.

 

[Lovemyev]

The pod point was still showing charging despite my car saying it was 100% full and the badge was extinguished.

Something is clearly not right here I feel ?.
All this is a direct result of me taking my car in for it's first service.
Car went into the dealers working just fine,
At the end of the day, the car was rendered complete dead and stuck on a ramp.
Three days latter, I collected the car with it getting the latest BMS update that I asked NOT to receive.
Now it has become a big headache for myself and others it would seem.
If it's not broken, don't try and fix it !.

 

[Smendon]

So this is odd...

I put my car onto charge at 12:00 pm and it was 92%, charging at 6kwh. Had a look at 4:30pm and it had finished equalising. I unlocked the car and then it started equalising again so I left it a bit.

Had a message on my Ohme app that the charge had finished, so I checked the car again and the MG light was off. I unplugged, then switched the car on and it showed that I had 444v again, but with less mileage than when it was fully charged this morning (full charge this morning was 147 miles, full charge this evening showing as 146 miles - both on Normal mode, everything switched off).