Public Charging MGS5

[nickeva67]

Hi
I have just received delivery of a MGS5 Trojan and as I live in a flat I don't have access to my own charger but there is a bank of 20 chargers just 5 minutes walk away.
Thought I would try to charge my vehicle to 100% even though it was still on 77% battery charge to make sure I knew what to do and had signed up to the supplier app ok.
The charger said it was capable of charging at 11kW but I was only getting 3.4kW with the MG supplied charging lead, the car was set to max charging and it took 5 hours.

My questions are do I need to get another charging lead? If so what one?
Was the car charging slower as it was in the 80% to 100% range to protect the battery?

Thanks for any advice

 

[Rei]

The maximum that it can do is about 7kW, usually more like 6.5kW in my experience. About 10% an hour.

It does slow down as it gets close to 100%, but 5 hours does seem like a lot. It might be because it's new and the battery hasn't been balanced for a while, so I'd try running it down to say 20-30% and then charging it all the way up again. Expect it to take at least 8 hours though.

 

[xblackwolf90]

The MGS5 is only capable of single phase AC charging.

11kW charge points are 3 phase.

As your car can only use 1 of the three phases, on an 11kW charge point the maximum charging speed possible is 3.6kW (11 divided by 3).

You'll lose a small amount during charging so you'll likely see a max of around 3.2kW on an 11kW charging point.

You will get the full 7kW (or about 6.9 or so) on a 7 or 22 kW charging point only.

 

[blohot]

The maximum that it can do is about 7kW, usually more like 6.5kW in my experience. About 10% an hour.

It does slow down as it gets close to 100%, but 5 hours does seem like a lot. It might be because it's new and the battery hasn't been balanced for a while, so I'd try running it down to say 20-30% and then charging it all the way up again. Expect it to take at least 8 hours though.

Yes, this tracks with my own experience totally. My Sync EV charger works at around 6.6 KW and charges around 10% every hour.

 

[peterseddon]

I've used some so called 7kW chargers but the speed was throttled to 3.5 kW by the charger, it's probably not your car that is the problem.

 

[xblackwolf90]

I've used some so called 7kW chargers but the speed was throttled to 3.5 kW by the charger, it's probably not your car that is the problem.

If you're receiving 3.5kW on a 7kW charger, many 7kW posts have two connectors. The 7kW is shared between the two connectors, so if another car plugs in, your speed will be halved.

Some are certainly throttled as you say.

However, it is impossible to get more than 3.6kW with an MGS5 on an 11kW charge point, for the single vs. 3 phase reason outlined above.

 

[nickeva67]

Thanks all
So to get a faster charge should I charge on a 7kW charger and avoid the 11kW charger as you only get a third of this?

 

[dx4100]

7kW charger on AC, or a ultra fast DC charger you see at service stations etc.

 

[xblackwolf90]

Thanks all
So to get a faster charge should I charge on a 7Kw charger and avoid the 11kw charger as you only get a third of this?

For AC charging, yep!

Both 7 and 22 kW AC chargers will get you the car's maximum charge rate.

Alternatively, charge up at a DC rapid charger. If you don't have charging facilities at home, a £10 per month subscription to either Tesla or Ionity may be beneficial, and will get you rates of 40-43 pence per kWh which is cheaper than many 7kW posts. Useful, but only if you have one of their chargers nearby.

 

[Lovemyev]

Thanks all
So to get a faster charge should I charge on a 7Kw charger and avoid the 11kw charger as you only get a third of this?

If you are AC charging at a public charger, then I believe the car is going to max out at 7kW.
So there is absolutely no advantage in trying to gaining time, by using a higher rated A/C post.
Other than annoying other EV drivers who can exploit the higher powered type 2 posts.
If speed is the priority, then DC charging via a rapid charger is your best option here.

 

[nickeva67]

For AC charging, yep!

Both 7 and 22 kW AC chargers will get you the car's maximum charge rate.

Alternatively, charge up at a DC rapid charger. If you don't have charging facilities at home, a £10 per month subscription to either Tesla or Ionity may be beneficial, and will get you rates of 40-43 pence per kWh which is cheaper than many 7kW posts. Useful, but only if you have one of their chargers nearby.

I have e-on chargers 5 min walk away which had 7kW & 22kW chargers at £0.45 so I thought using the 22kW would be quicker.
Will try the 7kW charger next time I charge

 

[Coulomb]

I have e-on chargers 5 min walk away which had 7kW & 22kW chargers

Did you mean 11kW instead of 22kW? If you are only getting 3.4kW from a 22kW AC "charger", then you could have a 16A cable. For a car with a 7kW charger, you should have a 32A cable. Hopefully that is what was supplied.

Edit: To check your cable's current capacity, see for example this post:

Post in thread 'Does charge cable affect charge speed?'

Oct 24, 2024

On Amazon they sell all these different cables for different kW ratings (7, 11, 22) and 1 phase or 3 phase, but does it actually matter?

Yes, it certainly does, or it can. As does the power of the EVSE (AC "charger").

The worst combination, as @Tight Git mentioned, is an 11 kW EVSE with a 7 kW vehicle. Each phase of the three-phase source can only deliver 16 A (3.6 kW), and the vehicle can only charge on one phase. So 3.6 kW max.

The other problem is if you have a 16 A cable. The cable will have a resistor in it that tells the vehicle how much current it can draw. If...

• Coulomb

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Note that some models come with an 11kW on-board charger, which further complicates discussion.