Fast charging in warm weather

unkel

Did anyone notice any difference? I can't say I have been paying too much attention, but I happened to have a look at my local efacec fast charger today a few times.

The Ioniq was charging at 54kW (normally 51-52kW, I don't think I've ever even seen 53kW before) and not just to 80% when it normally starts to get slightly slower

It was still at 54kW at 84% when I switched it off as a Leaf had parked up and I had plenty on board - was about to switch off anyway were it nor for me being fascinated with the relatively high speeds. Also the efacec charger has a pretty loud cooling system that I never heard (at presumably max fan speed) until the current heatwave

Is this the same for everyone? That charging is going faster when it is warm? The outside temp was 27C when I charged at about 16:30PM today

cros13

Higher temperature to a certain extent correlates with reduced internal resistance and higher reaction speed within the pack... speeding up your charge.
However the speed of reactions you don't want... like irreversible parasitic reactions and dendrite formation also increase.
The proportions of reactions you do want vs reactions you don't varies by chemistry, state of the battery and precise temperature.
But in general the chemistries in modern EVs achieve the best balance between the two at pack temps of between 21C and 23C.

unkel

cros13 wrote: »

However the speed of reactions you don't want... like irreversible parasitic reactions and dendrite formation also increase.

I'll let Hyundai worry about that given the 8 year warranty on the battery!

In the meantime I'll keep enjoying the great weather, the incredible range of my car for such a small battery (average 12kWh/100km over the last month driving the bejaysus out of it - 200km indicated after charging it today to 84% after two 45 minute partially motorway trips with AC at full blasts and speeds up to 140km/h) and even the faster charging times

ELM327

Ioniq peak charging is at 76-77% where it is capable of over 70kW (given appropriate charging capacity). Then at 85% it drops down to 22kW and at 92% drops down again until it finishes at 94%.
I have to say I haven't noticed faster charging speeds as much as I have the vastly reduced consumption.
I managed 11kWh/100km on the motorway in to work one of the days.

In my old leaf the difference in charging speeds on hot days was exponential. I could be pulling 20kW at 80% SOC vs 9kW in the cold.


(One of the days it was really pelting down rain I managed to get 19kWh/100km which I think given the Ioniq's efficiency is equally impressive)

liamog

One thing to be aware of is the difference between energy used and energy in.

I've found that even in hot weather the Ioniq will receive a max of ~127A from an Efacec charger, giving a peak power of around 49kW.
The power meter on the charger is showing the energy used to provide that which includes the cooling requirement for the charger and efficiency losses.

Shefwedfan

You just trying to take the pi** out of Leaf 2 owners :-)

unkel

liamog wrote: »

The power meter on the charger is showing the energy used to provide that which includes the cooling requirement for the charger and efficiency losses.

That is consistent with my observation that the charger cooling fan was very loud. Maybe the extra few kW went to the charger itself so