Information & Inspiration For MG Electric Vehicle Enthusiasts
2022 SR trophy charging speed
- Thread starter Nickr
- Start date
rpannell
Established Member
Is it a new charger? If so, is it setup for 7Kw?
Any chance that you are looking at 30min slots from your smart meter so that 3.5kwh in 30 mins is actually 7kwh in an hour?
Any chance that you are looking at 30min slots from your smart meter so that 3.5kwh in 30 mins is actually 7kwh in an hour?
Nickr
Standard Member
I will try that, I have tried it on 3 different chargers, 1 at home (pod point solo)and that was changed from 3 to 7kw with dip switches inside along with cable. Others were labeled as 7kw
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Mihir
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I have a SR and it charges around 6.6 kW for me on my home charger. Easier way to measure is to calculate based on how much SOC gets added. 100% is approx 50 kWh(battery size). So if you start the charge at 20% and charge for 4 hrs, at 6.5 kW x 4h = around 25 kWh, that about 50% of the battery. So you should end up with around 70%(if you started at 20%) after 4 hrs. According to you what you are saying at 3.5kW, are you ending up with an approx 15% added to SOC only after 4 hours?
[ Edited Coulomb: units ]
[ Edited Coulomb: units ]
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N2STY
Distinguished Member
Yep that's not good and you said it's the same on over charges I would probably if it was me try a battery reset ie discount the 12v battery from the negative - terminal
for like 10/15 minutes and if still the same would have to go to dealer do you know anyone else with a electric car? could be worth getting them to plug in your charger to confirm its working at 7kw so you have proof when it go's back to dealer so the can't fob you off with load balancing or something at your end
r0b1n68
Established Member
Is it possible that the cable is a three-phase 11KW cable ?
You would get around 3,7KW on one phase, because the SR model have a single-phase charger
Mogshock
Established Member
I have an SR and have to say that I never have trouble with charging speeds from a fast charge, always around 6.6Kw. I did once pull 1.84Kw from my own charger but that's because I had it on Smart mode. Used the RFID card to override and it was fine.
Cable is a 7.5m 32A single phase type 2.
Cable is a 7.5m 32A single phase type 2.
Lovemyev
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If you have tried 2 other, reliable ( known good ) 7 kW AC posts with the type 2 cable provided by the dealer and the car is still only requesting roughly 3.6 kW.
Then it has to be a problem with the car surely ?.
Does it rapid charge okay ?.
It bypasses the inverter when using a DC rapid.
I had a problem when I first received my car back after it had the BMS update.
When I placed the car on charge, it would only charge at 3.6 kW.
I noticed this on my home energy meter.
One time it would hit 3.6 kW and go above this figure.
The next time, it would hit just over 7 kW ???.
I monitored it over about 2 weeks and then it started hitting 7.0 kW every time ??>
I can offer no explanation of this strange behaviour.
It did NOT behave like this before the BMS update.
I will say, that when monitoring this strange behaviour, what I did learn is this.
When the car is requested to charge, the current provided to the car from the wall box, is done in a "Stepped Type Fashion".
I spotted this on my energy meter.
It briefly commences the charge at 3.6 kW then after a small pause, it would then jump shapely up to 7.0kW.
Maybe .......... ????????.
Your car is failing to increase up to the max 7. kW ?.
I also discovered that it works in a similar fashion when performing a full charge.
A wall box will supply the max 7.0 kW until it reaches about 98% and then the car will ramp done the charge to 3.6 kW before finishing, when it reaches 100%.
You say, this problem appeared to start after the last full charge last weekend ?.
Does the car somehow believe that the battery is still at a high SOC ?.
After you have tried the 12 volt disconnect etc.
If this is unsuccessful, then this has to be a visit to the dealers, I am sorry.
Looking a lot like a BMS issue surely ??.
Please keep us informed !.
[ Edited moderator: consistent units. ]
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Nickr
Standard Member
Had the car 3 weeks, never gone above 3.5 kW, gonna try a rapid tomorrow on a 120 instalvolt then a local 7kW post others find reliable. Fingers crossed 
, Been driving EV 4.5 years now some may think I don't know what I am on about (dealer's) no offense intended to anyone from a Sheffield lad
, Been driving EV 4.5 years now some may think I don't know what I am on about (dealer's) no offense intended to anyone from a Sheffield lad
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N2STY
Distinguished Member
I take it the battery reset did not help thenHad the car 3 weeks, never gone above 3.5 kwhr, gonna try a rapid tomorrow on a 120 instalvolt then a local 7kw post others find reliable. Fingers crossed
N2STY
Distinguished Member
It's all good please keep us up to date would love see the outcome
Lovemyev
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Thank you for posting!.
It's never nice to hear problems that other people are suffering with their cars.
But it does offer a LOT of owners the chance to try and help in any way they can.
In this case, it looks very much like the dealer will have to intervene in this case.
Good luck and please keep us posted !.
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