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Post 2.4 Charge Curve

3325 Views 21 Replies 10 Participants Last post by  Briggo
Wondered how people are doing with the post 2.4 update charge curve?

I used a 350kW charger at Wetherby the other evening, needed a quick 30 miles or so to give me some contingency for my destination.

I was stopping a lot earlier than I normally would, and ended up plugging in at 48%.

I was a bit surprised to see the charge rate jump to 101kW, I’m pretty sure it was never that high in the 40s before, more like 70 something. I unplugged at 58% and was still pulling 81kW.

I haven’t seen any official charge curves for the 82kWh battery on the GTX, and I’m certainly not complaining, but has anybody else seen jumps in charge speed and seen a new vs old curve anywhere?
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Yes, you’re probably correct about that, mine should be 135kW as it had 2.3 from the factory.

Hadn’t noticed such high charge rates at those percentages before, hence my query.
According to YouTubers the ID4/5 GTX with 3.0 will get a peak of 175kw that drops fairly fast and matches the 2.3 charge curve at higher SoCs, and the other ID4/5 with 77kwh batteries will get a peak of around 150kw but the curve is flatter (100kw all the way to around 80% I think) and it actually does a big charge faster than the GTX. I've seen conflicting reports on which option applies to the ID3 Tour. VW state that all of the above get 135kw (upgraded from 125kw on 2.x) but that figure has been shown to be very pessimistic. Their 120kw stated limit for the 58kwh battery is also pessimistic.
Interesting that you have seen a benefit with 2.4 of plugging in at higher SoC. The VW website says that 58kwh batteries got the new charge curve with 2.4 (or 2.3 ex works) but the 77kwh only get it with 3.0. Maybe they've also done something to help it follow the ideal charge curve more closely when plugging in at high SoC, if so that would be good.
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No, it's not just you.

Earlier in the week, was on a BP 150kw after a short journey to it, this was at around 40% SOC starting charge and was only getting 50kw. This morning a few days later at Gridserve Norwich on one of their 350s at 42%, got 59kw down to 49kw once hit 80%. This was after a 5 mile journey from the hotel, so although it was warm outside I'm guessing the battery wasn't warm enough on both occasions as later on I stopped on the A1 at Retford services on one of the 175kw Shell Recharges on the way home (140 mile trip), turned up at 23% and pulled 110kw straight away, I stopped it at 61% SOC and it was still pulling 69kw.

This is in a Born 58kw on 3.0 software.

If this still exists in a few years time when more and more folk get EVs, it'll be all over the Daily Fail about the stories of people not getting the advertised charging rates because of the lack of understanding of how it really works and the complexities.
Appreciate I'm replying a bit late.
What you describe is all completely normal in a 58kwh ID3/Born. I assume all other MEB platform cars are similar in behaviour but don't know for sure. The entire charge curve depends on what SoC you plug in at, even at constant temperature. If you plug in with a 58kwh model at 40% you'll never get a decent charge rate, 50-60kw is all you can expect. Conversely if you plug in at 5% it'll do 130kw+, pass 100kw at 30% and probably be doing over 80kw as it passes 40%.
Personally I have only ever seen the ideal charge curve (twice) plugging in under 12%. I've had well over 100kw a couple of other times, again plugging in around 7-10% ish - and on those occasions it was following the ideal curve by the time it got to 25-30%. A couple of times I plugged in at 19-20% and got up to about 100kw, but it was down at 90kw or lower by the time it reached 30%. Plugging in above 20% I've never seen more than 90kw peak I don't think.
The algorithm in the car that determines allowable charge rate for the charger is obviously pretty complex. In summary, if you want it to go fast, you need to plug in low.
It would be great if they could modify this behaviour a bit in a future software update. In Battery Life's recent ID3/Mégane 'race' he showed that while the Mégane has a very similar charge curve when plugging in low, it's better if you plug in at higher SoC because it seems to follow the 'ideal' charge curve whatever SoC you start at (assuming good temperature) rather than behaving like the ID3 does.
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