11kW Charge Hub only 3kW output

R

Robe

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MG4 SE LR
Hi all.
We've had a Charge Hub 11kW installed and oddly only getting 3kW when charging regardless of the battery % at the time and the temperature.
The car is set to AC Current on the charge options, I'm assuming this means allow the max current available as the other options are 8A and 16A.
The Charge Hub has been installed on 32A 400V 3 phase circuit so there should be a bit to work with.
If I hook up to the local free public charger I'm getting around 5kW so it doesn't seem like the car is limiting the charge rate.
It's hard to find any details on what type of output anyone is getting with this charger, I'd be interested to know what others are getting from their Charge Hubs. MG Australia haven't been able to help much, just told me to take the car in to check and they've told me they couldn't spot anything. The guy at the repair desk did say that 11kW was the maximum it could put out, I pointed out that 3kW was a long way off this though.

Regardless of the charging speed, how much fun are these cars to drive? The MG4 handles really well and the linear power delivery translates to the biggest sweet spot I've ever encountered.
 
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I am not sure but I think your car only has a single phase 7kW charging. If plugged into a 11kW three phase charger then 3kW is about right. Take a photo of your charging socket and post. The way to tell if your car has three phase charging is if all the holes in the cars charging socket have pins in them.
 
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Nicko said:
I am not sure but I think your car only has a single phase 7kw charging. If plugged into a 11kw three phase charger then 3kw is about right. Take a photo of your charging socket and post. The way to tell if your car has three phase charging is if all the holes in the cars charging socket have pins in them?
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It should charge at 6.3-6.8kW if rated at 7kW and plugged into a 11kW charger, shouldn't it? Contact the installer, if the car is charging at faster AC speeds elsewhere, then the issue is with your charger.
 
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Nicko said:
I am not sure but I think your car only has a single phase 7kw charging. If plugged into a 11kw three phase charger then 3kw is about right. Take a photo of your charging socket and post. The way to tell if your car has three phase charging is if all the holes in the cars charging socket have pins in them?
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Wow! Thank you Nicko. I took a photo of the charging socket and can see that only L1 has pin. L2 and L3 are empty. So I'm only getting one phase of the three coming out of the charger. I'll talk to the dealer tomorrow and see where I can take it from here. Maybe they can swap me over to a single phase 7kW Charge Hub, I wonder if that would give me a bit more output. We have an Essence 64, maybe 3 phase is only on the Trophy.

YaR said:
It should charge at 6.3-6.8kw if rated at 7kw and plugged into a 11kw charger, shouldn't it? Contact the installer, if the car is charging at faster AC speeds elsewhere, then the issue is with your charger.
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We're definitely getting 5kW on the public charger. it could be 5kw on single phase. If the dealer can swap me over to 7kW single phase I might get 6kW or more and I'd be totally happy with that.
 

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YaR said:
It should charge at 6.3-6.8kw if rated at 7kw and plugged into a 11kw charger, shouldn't it? Contact the installer, if the car is charging at faster AC speeds elsewhere, then the issue is with your charger.
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11kW charge point is rated at 16A per phase, therefore only ~3.7kW max. single phase ... unless the charge point can auto-switch to 32A single phase if presented with a single phase load.
 
Yes ... that's exactly it. If your car had an 11kW (rated) 3-phase onboard charger then you'd typically get just under 10kW charge rate from an 11kW 3-phase charge point. (Remember that the AC charger is built into the car .. the charge point is just a glorified mains socket).
 
Thanks for the responses. This clears up so much.
Although the 3 phase charge is connected to a 32A circuit, it's only drawing 16A per phase and giving 3.5ish kW for each phase. If I had a single phase unit, it would use the full 32A on that single phase and should give me 7ish kW. I'll call Mr Dealer tomorrow and chat. Hopefully they help me out a bit seeing as they sold me a 3 phase charger with a single phase car.
 
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YaR said:
It should charge at 6.3-6.8kw if rated at 7kw and plugged into a 11kw charger, shouldn't it? Contact the installer, if the car is charging at faster AC speeds elsewhere, then the issue is with your charger.
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No as it's is 3.6kW per phase.

It's possible for a 3ph 11kW rated car to achieve 7kW on a single phase charger as each charge pathway is 3.6 so it bonds two charger pathways together.

But it can't convert 3ph 11kW at the EVSE to 7kW 1ph.
 
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Tell the garage they should have offered you a single phase charger not a three phase unless it was a 22kW. Your car can only take a single phase supply at approx. 6.5kw
 
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Robe said:
We're definitely getting 5kW on the public charger.
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The public EVSE ("charger") is probably a 22 kW unit, i.e. 3 phases of up to 7.2 kW each. I would have expected you to get the full 6.6 kW that your car is capable of charging at. Though the site might have limits, and/or it may have had to throttle due to other loads or time of use or peak shaving, though for a public charging site, 6.6 kW or even 22 kW is pretty much peanuts.

Was the 5 kW reported by the car or by the EVSE?
 
Coulomb said:
The public EVSE ("charger") is probably a 22 kW unit, i.e. 3 phases of up to 7.2 kW each. I would have expected you to get the full 6.6 kW that your car is capable of charging at. Though the site might have limits, and/or it may have had to throttle due to other loads or time of use or peak shaving, though for a public charging site, 6.6 kW or even 22 kW is pretty much peanuts.

Was the 5 kW reported by the car or by the EVSE?
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Depends, for example Aldi units are connected to the stores supply, so share it with the supermarket.

So if the store has a 400A (276kVA) 3ph supply and the store gets near to its connection limit they will throttle the chargers, much like domestic installs.
 
You've bought the wrong EVSE model for your car, and the dealer should have known that.

The 11 kW 3-phase unit will still work as you've seen but it will never supply more than 1/3rd of 11 kW to a car with an on board single phase charger.

Either a single phase 7 kW EVSE or a 22 kW 3-phase EVSE will provide your car with AC charge up to its maximum charge rate of 6.6 kW.

Single phase is ample while 3-phase is future proofing in case you get a different EV with an on board 3-phase charger. Even so, 7 kW is a decent charge rate when it has many hours to operate with. That's 40-45 km of range per hour (depending on your typical consumption).

Honestly I don't know why they sell an 11 kW 3-phase EVSE. 22 kW units can be throttled if necessary.
 
nickh66 said:
For each of these charging sessions at home & away, are you using the same Type2 cable? Have you tried a different cable?
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The chargehub is a hardwired type2 cable. I only have one cable for away charging and I got a faster charge speed that time.

wattmatters said:
You've bought the wrong EVSE model for your car, and the dealer should have known that.

The 11 kW 3-phase unit will still work as you've seen but it will never supply more than 1/3rd of 11 kW to a car with an on board single phase charger.

Either a single phase 7 kW EVSE or a 22 kW 3-phase EVSE will provide your car with AC charge up to its maximum charge rate of 6.6 kW.

Single phase is ample while 3-phase is future proofing in case you get a different EV with an on board 3-phase charger. Even so, 7 kW is a decent charge rate when it has many hours to operate with. That's 40-45 km of range per hour (depending on your typical consumption).

Honestly I don't know why they sell an 11 kW 3-phase EVSE. 22 kW units can be throttled if necessary.
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I spoke with the dealer today and they're escalating it to management. Hopefully they can swap me over to the single phase 7kW. They definitely shouldn't have let this charger go out with this model. It's rare to have 3 phase in a residential house, we were so happy to think we'd be getting some use out of it.
 
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Robe said:
It's rare to have 3 phase in a residential house
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While less prevalent, it's not rare. It varies depending on where you are. It's less common in locations which rely on gas for space heating, water heating and cooking.

3-phase supply for homes is becoming increasingly common [ in Australia ], especially with the advent of all electric homes (and the removal of gas as an energy source) with ducted AC, induction stoves, large solar PV systems and EVSE.

Good luck with the dealer, I hope they do the right thing. They really they ought to know better, but frankly at this stage I think the customer base knows more than they do about what they are selling.
 
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wattmatters said:
While less prevalent, it's not rare. It varies depending on where you are. It's less common in locations which rely on gas for space heating, water heating and cooking.

3-phase supply for homes is becoming increasingly common, especially with the advent of all electric homes (and the removal of gas as an energy source) with ducted AC, induction stoves, large solar PV systems and EVSE.

Good luck with the dealer, I hope they do the right thing. They really they ought to know better, but frankly at this stage I think the customer base knows more than they do about what they are selling.
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It's rare in the UK as we have generally high powered single phase connections in comparison to our European counterparts.
 
I havnt seen in any of the post above which model vehicle you have. Here in Australia, I have the LR 77kw essence (trophy). It has the extra pins and I have the 11kw charger on 3 phase. It is capable of 10kw. As others have suggested it is likely that you have the 64kw NMC battery and that is limited on the AC to single phase and you have the incorrect charger. I will try to add some pics of socket pins and charge rate.

Plug pins and charge rate

DerekH said:
Plug pins and charge rate
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DerekH said:
I havnt seen in any of the post above which model vehicle you have. Here in Australia, I have the LR 77kw essence (trophy). It has the extra pins and I have the 11kw charger on 3 phase. It is capable of 10kw. As others have suggested it is likely that you have the 64kw NMC battery and that is limited on the AC to single phase and you have the incorrect charger. I will try to add some pics of socket pins and charge rate.
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I have a standard excite and an EVcharger portable 11kW through a 3ph 32A house socket and it achieves 9.9kW.
 

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