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Discussion Starter · #1 ·
We've had almost interminable discussion about how fast we can charge our EVs at public chargers, most particularly the claim that a Leaf can be charged to 80% in 30 minutes.

My OCD side (which is a lot of me) is interested in this, and a few days ago I noticed that the newer Thurrock Services rapid charger started tailing off after the battery was only 32% charged. I have in the back of my mind a charger I used once that was still whacking the electrons out at 100 amps or so when my battery was 70% charged. The Gloucester Nissan rapid was the slowest I have experienced, which took about 50 minutes to get me up to 85% from about 20%.

I invite others to record their results here: such details as site of rapid charger, state of charge when you start charging, initial volts/amps, the SOC when you notice the amps dropping off (record the ampage at different stages by all means!) the SOC when you finish, and the number of minutes it took.

Of course, you might prefer to drink a cup of coffee over a crossword instead, but just think what you'd be missing if you did!
 

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Discussion Starter · #3 ·
It might be worth having a different thread by vehicle type otherwise it could become difficult to compare results.
 

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Outlander 23 mins from flat normally about 50amps but I've never checked at different times of the cycle.
 

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15 kWh in 33 minutes at the Cobham rapid on the left on Saturday evening.

Didn't check where I was at percentage wise, but had passed the first low battery nag from the LEAF some time before.

The other one was dead. :(


(edited to change 30 minutes to 33, found my note from the day just now). :D
 

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15 kW in 30 minutes (exactly) at the Cobham rapid on the left on Saturday evening.

Didn't check where I was at percentage wise, but had passed the first low battery nag from the LEAF some time before.

The other one was dead. :(
Am beginning to wonder if your car has a fault... (Wouldn't that be amusing? You've been so adamant that the charging rates fail to live up to expectations, despite pretty much everyone else disagreeing with you, only to find out the problem isn't with the chargers at all...)
 

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I assume you mean 15kWh...
That's what I said.




When I edited it just now. :oops:

Am beginning to wonder if your car has a fault... (Wouldn't that be amusing? You've been so adamant that the charging rates fail to live up to expectations, despite pretty much everyone else disagreeing with you, only to find out the problem isn't with the chargers at all...)
My experience matches those I've seen charging and the discussions I have at chargers with non-forum folk in the past.
 

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My experience matches those I've seen charging and the discussions I have at chargers with non-forum folk in the past.
Certainly need to capture the voltage and ampage around the 50% mark (it should be 396v, 106a), and then see where it starts to tail off (I think it's about 58% from what I've seen).
I've used Cobham twice, once on each charger, and don't recall them being slower than usual.
 

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Certainly need to capture the voltage and ampage around the 50% mark (it should be 396v, 106a), and then see where it starts to tail off (I think it's about 58% from what I've seen).
I've used Cobham twice, once on each charger, and don't recall them being slower than usual.
I was in a rush to be honest. The one I used has been out of service (no signal) every previous visit, so when the one on the right was dead late on a Saturday night I was just in a rush to get to the other one and hoping it worked!
 

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Discussion Starter · #14 ·
Certainly need to capture the voltage and ampage around the 50% mark (it should be 396v, 106a), and then see where it starts to tail off (I think it's about 58% from what I've seen).
I've used Cobham twice, once on each charger, and don't recall them being slower than usual.
The newer Thurrock one started winding down at 32% when I used it a couple of weeks ago.
 

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My C-Zero got an all-time high this morning... 67A at 361V making 24.2kW

Total charge session was 3.01 kWh in a few seconds under 14 minutes. So, about 12.9kW average. You can see why I am so keen on per kWh pricing rather than per minute! In Hampshire that 3.01kWh would have cost me £4 (so about £1.33 per kWh) or in Milton Keynes it would be £7.50 (so £2.49 per kWh).
 

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Discussion Starter · #16 · (Edited)
I spent 38 minutes taking intermittent photographs of the M2 Medway (eastbound) rapid charger this evening.

Starting details: 10°C ambient temperature; battery: 4 bars; SOC 18%, dry roads, not raining, fairly gustyy breeze, SW I think.

Minutes..Volts...Amps....% Charge....Kw
0........360.....36......18........12.9
0........371.....106.....19........39.3
3........384.....98......25........37.6
4........387.....89......29........34.4
8........390.....80......36........31.2
11.......393.....74......42........29.1
15.......394.....70......48........27.6
19.......395.....60......55........23.7
22.......395.....50......59........19.8
27.......395.....40......66........15.8
30.......394.....35......69........13.8
32.......394.....30......71........11.8
38.......394.....20......76........7.8


At this point my interest in warmth became rather greater than my interest in science so I stopped the charge. Fleetingly there was a screen showing that I had used 16.8kwh.

After the charge the battery had increased to 5 bars of heat.

I then drove home, a distance of 49.3 miles, which left me 20% in the battery.
 

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It would be useful to note whether any other EVs are on charge... we know Tesla superchargers throttle the power level when multiple cars are charging and I suspect many of the multi head units that support simultaneous charging will do the same.
 

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Discussion Starter · #18 ·
That's a lone charger, although it has a mirror image on the other side of the motorway. I would imagine that they have independent circuits. I was the only one there.
 

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I spent 38 minutes taking intermittent photographs of the M2 Medway (eastbound) rapid charger this evening.

Starting details: 10°C ambient temperature; battery: 4 bars; SOC 18%, dry roads, not raining, fairly gust breeze, SW I think.

Minutes..Volts...Amps....% Charge....Kw
0........360.....36......18........12.9
0........371.....106.....19........39.3
3........384.....98......25........37.6
4........387.....89......29........34.4
8........390.....80......36........31.2
11.......393.....74......42........29.1
15.......394.....70......48........27.6
19.......395.....60......55........23.7
22.......395.....50......59........19.8
27.......395.....40......66........15.8
30.......394.....35......69........13.8
32.......394.....30......71........11.8
38.......394.....20......76........7.8


At this point my interest in warmth became rather greater than my interest in science so I stopped the charge. Fleetingly there was a screen showing that I had used 16.8kwh.

After the charge the battery had increased to 5 bars of heat.

I then drove home, a distance of 49.3 miles, which left me 20% in the battery.
That looks significantly slower than I recorded a few weeks ago at Baldock. Admittedly, ambiant temperature was much higher then, but I'd be surprised if that made a major difference.

What strikes me here is that you didn't reach maximum voltage until 19 minutes in, by which time the current had dropped, whereas I saw 396v and 106a within the first minute, and it stayed that high until about 58%.

So what's the cause of this major difference? The supply to the charger or the overall power use on site?

As an aside, I topped up at Baldock yesterday (on the DC/CCS) and received 10.4kWh in 17 minutes - I arrived with about 15% and left with 60% (just before I ended the charge it was showing 396v/67a @ 59%). On my previous charge I think I used the DC/AC charger, and that didn't drop to 67a until ~69%
So are the DC/CCS chargers slower? (I've wondered this previously).
 

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@flipper dont forget that variables like car and charger firmware could have a huge impact on charge times... a study like this is tough for a commercial organisation and almost impossible for an adhoc group of EV drivers :rolleyes:
 
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