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Hyundai Ioniq 38kW EV
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Discussion Starter · #1 ·
Have had the opportunity to test out the rapid charging functionality of the Ioniq. Overall no issues at all.

Few of observations / comparisons to the LEAF charging:

  • Charge rate typically starts off at around 25kW
  • This increases to around 32-33 kW once the batter gets a bit warmer.
  • Highest rate I saw was 42kW (today)
  • Towards the end of the charge cycle (ca. 60%), the rate then tapers off again to ca. 22kW

Total charge time from 6% up to 80% was around 40-50 mins, which was acceptable.

With the LEAF, the charge rate typically starts at around 40-45kW before slowly tapering down at around 60% and finally reaching 25% at around 80% SOC.

Due to the cold weather, I did hear that the battery heater seemed to start up (at least I think it was the heater)?

Overall no issues with the charger rate, particularly during the current cold climate. Am sure when the weather starts warming up then the rate will be faster.
 

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This pretty my much matched my charge rate on a 50kw Pulse charger at -1c last night. Didn't see the 42kw rate though and only charged to 70% because that was what I needed to get home.
In the summer it will ramp up to 42kw reasonably quickly, drops to 38kw at 56% and then to 22kw at around 75%
 

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I have not seen my car do that pattern, but then again that is for a 175kw charger, where I charge they are only 50kw chargers.
 

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I expect it should follow the yellow line in most circumstances

View attachment 138146
Since general opinion is that battery temperature has a marked effect on charging rate, it would be useful to know what temperature these characteristics relate to, and why for a 50 kW EVSE you "expect charging to follow the yellow curve in most circumstances"...
 

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'19 i3 120Ah / '20 Kona 64kWh / '21 e208 / '22 ID.3 Family
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I have not seen my car do that pattern, but then again that is for a 175kw charger, where I charge they are only 50kw chargers.
The yellow line is for a 50kW charger
 

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Since general opinion is that battery temperature has a marked effect on charging rate, it would be useful to know what temperature these characteristics relate to, and why for a 50 kW EVSE you "expect charging to follow the yellow curve in most circumstances"...
I don’t know what conditions Fastned plotted that curve under, but I think it’d be fair to assume they did it in 'average' conditions (ie. in most circumstances).

Some other info here in relation to the 28kWh:
 

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I don’t know what conditions Fastned plotted that curve under, but I think it’d be fair to assume they did it in 'average' conditions (ie. in most circumstances).

Some other info here in relation to the 28kWh:
I've found what Fastned have to say about battery temperature :

"Influence of temperature on charge speed
Another factor that can have a significant influence on charge speed is the temperature of the battery. A battery works optimally if the temperature is not too high and not too low. In practice this is usually between 20 °C and 30 °C, although some cars function best with a battery around 40 °C.

In winter a battery can get very cold, for example if the vehicle is parked outside. This can cause charging to be (much) slower. Conversely, a battery can become very warm during a hot summer day and this can also cause charging to go slower.
The influence of the temperature on the charge speed is different for each vehicle model. Some models are equipped with thermal management for the battery. This way the battery can be cooled or heated depending on the circumstances,. However, on a cold day, it can take a while before a battery pack is completely heated up"

My suspicion is that the Fastned curve is probably for temperatures rather above freezing...
 

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eNiro 64kWh 2021. Ioniq 38kWh 2020.
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We don't use CSS charging very often in our 38 kWh Ioniq, but in the last week we have used one three times. Each time, charging maxed out at about 25kw. This was at Instavolt (car likely to be cold) and then at PodPoint and Electric Highway (very cold day, but we had driven for over an hour before charging, so hopefully a warm battery).

I was disappointed and wondered why so slow. Is the car reporting incorrectly?
 

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We don't use CSS charging very often in our 38 kWh Ioniq, but in the last week we have used one three times. Each time, charging maxed out at about 25kw. This was at Instavolt (car likely to be cold) and then at PodPoint and Electric Highway (very cold day, but we had driven for over an hour before charging, so hopefully a warm battery).

I was disappointed and wondered why so slow. Is the car reporting incorrectly?
I use rapids frequently as the car travels up and down the country for work. Most I’ve seen is in the 40s but frequently mid-high 30s. You’re probably aware the car reduces charge rates depending on battery %. If you haven’t seen more than 25 at various chargers and from a well depleted battery that doesn‘t match mine....sorry I can’t explain the difference.
 

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What was the battery percentages when you connected each time?
Were the charge sessions in the same journey?
They were two separate journeys on the same day:

1. We had travelled 92 miles on the motorway and charged when there was about 40% left on the GOM. We charged to about 80% at a Lidl PodPoint.

We traveled another 28 miles before stopping for a few hours.

2. We then travelled 82 miles on the motorway and charged when there was about 16% left. We charged to about 40% at an Electric Highway.

On both charges the reading on the car was 24-24 kw per hour.
 

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I think it's a cold battery problem. Best I've seen with SOC below 50% is 42 kW, and above 50% SOC the charge rate drops to something like 33 kW for a bit, then drops again. Even then I was seeing about 25 kW immediately after plugging in, and it rose slowly as I charged, so that was probably warming the battery more than my economical driving style had done (max 60 mph ish on m'way). I suspect it may need maybe 15 mins at 70 mph or something like that to start getting the battery nicely warmed up.
 
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The first charge at 40% may warrant a fairly low state of charge but at 16% I would expect a higher charge rate, but I have seen it start this low when it is cold. But in either case the charge rate may increase after a while when the battery warms through charging. Not charge much recently but on my last major trip it was starting at 20 something and ramped up to 30 something after a while, outside temp was -1c. I don't think I have ever seen a 40kw+ charge upon connecting but have after a little while. It drops from 40+ at 56% and usually runs at high 30's until 74-5% in the summer but it has been a bit different lately.
If you were not sitting watching it it may have got a bit higher whilst you were away from the car, and if you got back after 75% 22kw would normally be what you would see.
I have read on other. Forums that driving at a constant speed does not really warm a battery not to the sweet spot that it likes for charging anyway
 

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Thanks for the replies. I think that on the first journey we would have been travelling at about 70mph, but a bit slower on the way back due to less battery charge. Interesting that the battery may not be warm enough to take a 'full-speed' charge, I would have hoped that over an hour on the motorway would do the trick.
 

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Thanks for the replies. I think that on the first journey we would have been travelling at about 70mph, but a bit slower on the way back due to less battery charge. Interesting that the battery may not be warm enough to take a 'full-speed' charge, I would have hoped that over an hour on the motorway would do the trick.
The battery may still be too cold. I understand that it heats the battery to 20C if the charger is delivering over 3.7kW. It adds 0.5C per minute apparently, so as you only charged to 40%, the battery may still have been below 20C by the end. If you'd have left it a bit longer it may well have ramped right up.
 

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On a relatively New Ioniq arriving with 5% and an Ambient of 4 Dec C and 50 miles travelled this is the profile I saw on a 50 KW Rapid
5-33% - 32 KW
33-63% - 36KW
63- 65% - 34KW
65-74% - 35 KW
74-80% - 22KW
80% 90%- 14KW
Beyond 90% not sure but <10KW

So as an approximation 5 to 75% 35 KW, 75 to 90% 15 KW beyond that "very slow". Its close to the yellow line graph but without the initial kick above 40KW. Maybe in other seasons it'll get up to 40 or above but its too cold to test now as we are experiencing the second ice age - 2 reasons 1 I got an electric car , 2 I got solar panels. Its almost as powerful as the Alfa effect - Take the Alfa out of the garage to bring on the rain - it never fails in 35 years of ownership.
 

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Hyundai Ioniq 38kW EV
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Discussion Starter · #19 ·
Sorry to bring up an old thread, but considering that Hyundai widely publicise that we should be able to achieve up to 50kW charging speed on a rapid (38kW car variant), and it is clear that this is hardly ever possible, then surely this is mis-representation on the capabilities of the car?
 

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KIA Soul EV 64kWh
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Sorry to bring up an old thread, but considering that Hyundai widely publicise that we should be able to achieve up to 50kW charging speed on a rapid (38kW car variant), and it is clear that this is hardly ever possible, then surely this is mis-representation on the capabilities of the car?
They claim up to 50kWh, not any higher.
That's what people get.
What's the problem?

Battery SOC & temperature always limit the rate.
 
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