CCU failures

[Everest]

Is the not uncommon CCU failure on Gen 1 MG4's just specific to LR models, or does it happen to SE SR's as well?

 

[siteguru]

The common failures are with the early 3-phase LR models. I recall one or two CCU failures with the SE SR but it's not been endemic.

 

[Everest]

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

 

[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?