Issue with AC charging/New CCU fitted (Phase One SE LR)

[Coulomb]

Does that mean the SE SR Gen 1 doesn't have a 3 phase system?

Well, it will have a 3-phase motor. The question is, do they have a 3-phase on-board charger?

 

[siteguru]

The answer is No ... the SE SR has (and has always had) a 6.6kW single phase onboard charger. This also now applies (in the UK) to all MG4 models, except the ER which is the only one now to have a 3-phase onboard charger.

 

[Joules]

The answer is No ... the SE SR has (and has always had) a 6.6kW single phase onboard charger. This also now applies (in the UK) to all MG4 models, except the ER which is the only one now to have a 3-phase onboard charger.

I didn't realise the ER was 3-phase, thanks for that.

 

[Pryde]

I didn't realise the ER was 3-phase, thanks for that.

I have extended range and it only has a single phase charger

 

[Everest]

I have extended range and it only has a single phase charger

Oh! Definitely confused now.

 

[siteguru]

Must be EU/elsewhere then.

I have extended range and it only has a single phase charger

You've checked your charge port and can confirm no pins in the L2/L3 slots?

 

[Pryde]

Must be EU/elsewhere then.


You've checked your charge port and can confirm no pins in the L2/L3 slots?

That is correct no pins in L2 or L3

 

[Rolfe]

I'm not sure we ever positively confirmed the fault in an SR. There are quite a few phase one LRs that never developed it, too. (Or not yet!)

 

[Joules]

The answer is No ... the SE SR has (and has always had) a 6.6kW single phase onboard charger. This also now applies (in the UK) to all MG4 models, except the ER which is the only one now to have a 3-phase onboard charger.

Update, I've just checked the charge socket on my ER and definitely no pins at L2,L3. Hey ho. As I charge mostly at home, it's not an issue, if I'm out and about on a long journey I'll be using DC Rapid chargers...or AC if I have to.

 

[Everest]

Was just thinking about the CCU - am I right in understanding that the 3 phase chargers only allow 11kW charge - i.e. 16A per phase? But when used with a single phase they allow 32A on L1?

 

[siteguru]

Yes ... near-enough. The 3-phase OBC* is rated to 7kW single-phase as it binds (internally) two of the OBC phases to allow the higher charge rate. The dedicated single-phase OBC is only rated to 6.6kW for some reason, though in reality the difference makes little effect overall.

* On Board Charger

 

[Everest]

The 3-phase OBC is rated to 7kW single-phase as it binds (internally) two of the OBC phases to allow the higher charge rate

Thanks. Guess we'll never know, but the reason for asking is that I was wondering if the failures are restricted to those that have been charging on single phase? If so, that could point to the issue being related to poor CCU design not handling that much current, even if it is internally split. Do we know whether those who always charge with 3 phase also have that issue?

 

[siteguru]

That's a hard question to answer, as it would depend on the failure rate of CCUs in the EU (where 3-phase charging is more prevalent than it nominally is in the UK).

 

[Everest]

Yes, but do we know of any EU members on here that have had CCU failures?

 

[Penpons]

I have a 23 plate (May) MG4 Trophy LR that until recently has been working fine and good to drive, but a few weeks ago it suddenly developed a charging issue where it would stop charging after a few minutes, but only when using the AC charger at home (and also three public AC chargers I tried). DC Charging seems to work OK. I booked it into our local dealership where I bought the car on the 9th April and after an initial inspection they reported it was charging OK. However, I asked them if they could try an overnight charge to fully verify the system. This time the charging stopped after a few Kwh were added. The same happened when they used their own cable and agreed there was a fault. I rang them today to see what progress there had been and was told that the problem had to be reported to MG China for a response before they could go any further. I'm not sure if this is a common response for other forum members, but it surprised me that the level of in depth diagnosis capability and autonomy the dealers have to rectify faults on their own must be fairly low. Incidentally, the Weather App ,which has never worked despite several infotainment updates, has also been reported to MG for a response. They've had the car two weeks now and there is no end in sight for this problem, nor is there any chance of a courtesy car until mid May. Have others had similar experiences with dealerships?

 

[siteguru]

Search this board for CCU issue. It's a well-known problem for earlier cars with the 3-phase onboard charger. The only solution is a new CCU. (Apart from a couple of people who've had the issue resolved by software updates - that's what's tried first anyway, but the vast majority require new CCU hardware to fix it).

 

[Penpons]

Thanks, I had an idea I'd seen something about the issue elsewhere in the forum

 

[fshuk1]

They always ask China. I think it is partly for solutions but mainly to get the OK to do it under warranty.

 

[Tight Git]

Dealer will be instructed by MG to do software updates first, before being authorised to replace the CCU.

 

[Ian Key]

Mine's going through the process at the moment. They've tried the software update a month ago and it's going in again this morning and they are keeping it overnight so they can do the report for MG who will then approve the CCU replacement.

They've had the car two weeks now and there is no end in sight for this problem, nor is there any chance of a courtesy car until mid May. Have others had similar experiences with dealerships?

I don't know why your dealer has kept the car. I've been using mine although I've been paying an extortionate amount on public chargers