Since we discussed, I was occasionally recording SOC/Temp/Max Charge Values of my R90. The result of the so far 100 points you find below. The values are really used when charging, but are sometimes a little lower since the Max Charge Power seams also to depend on the actual DC Power to the battery. However, I am not able to define much more to this observation.
So far, with this diagram, all the charging curves can be explained. So having a very long “over the spec” charging cycle, the Zoe was actually cooling down the battery from 26°C to 18°C, thus extending the charge above approx. 55% SOC. In another charge, the spec was reached, there, the charging started @14°C and ended @26°C without actual cooling (as far as I can tell).
However, I did not find any dependence of this values to the Max Regeneration Power. It seams to be limited to the Max Voltage only (but has not been tested below 4°C)

http://www.spider.li/zoe/Max_charge_power_170406.png

One more test I performed which will contribute to our confusion:

The above Charge in short is:
TBattery Start: 13°C, SOC Start: 35%, Power 19-17kW, Stopped @70%SOC
One day later another Charge for testing:
TBattery Start: 15°C, SOC Start: 60%, Power 13-11kW, Stopped @70%SOC

so based on this two (non scientific) observations the charging power is depending on the Start-SOC Value and the Temperature. It is so weird. Another R90 driver observed the same thing, therefore I think I can post this here without getting declared as completely nuts.

Yes, it is very confusing. The odd thing is that the new models are allowing much higher regen values at the same time which is in contradiction to the charging behavior. I assume there will be an software update in the future.
I also gave this feedback to my dealer. He promised me to ask Renault about that.
If I get some answer, I’ll post them here. (although I am not sure if they are even answering)

Sorry for not noticing and approving your comment earlier…. So, the conclusion is that for the model 90’s, battery throttling is well underway (down to 18 kW) @ 48% SOCu and 16°C, whereas it should be able to go up to 40 kW under ideal circumstances (which is already half of the 2×0 models, given the [nearly] double size of the battery).

I am really confused about this, as the 2×0 models only start throttling back from 40kW (=2C) at this point and the 90 models seems to be throttling back to below 20 kW (=0.5C) at the same SOC/temperature point. In other words, the model 90 battery seems to be much, much more delicately handled by the BMS, and therefor much much less willing to charge at full power. This would limit IMHO the added value of a Q90 (compared to an R90) significantly. Thank you for this data!

4 degrees centigrade / SOC 50% on the old battery would allow a charging rate of roughly 0.5C (11 kW, 2 hours charging). 0.5C on a 40kWh battery of roughly the same chemistry would allow 20 kW……..

I am already hearing the 90 models are closer to the 2×0’s in charging power (in kW) limits (as opposed to charging rate in C’s). This makes totally no sense to me, especially if the regen is so high as you report.

Could you maybe check with the wallbox if the real power taken maches roughly the Max Charge Regen?

Confused!

Test conditions:
T-Battery: 4°C
SOC around 50%
2 times driving a little bit the hill down approx. 400 Meter distance and up again
Aircon On

Theses are the values of the Max Charge:
Start: 10.4kW
Regen with 5-17kW: Value decreases 6-8kW
Stopped and drove up again (around 40kW Power): Value rises to 19kW
Stopped and waited: Value decreases within 2 Minutes to approx. 14kW, tendency decreasing

Did not believe an tried again, this time only with Aircon:
Start: 12kW
AirCon On (2kW): Value rises to 14kW
AirCon Off (0kW): Value decreases to 12kW

Now with charging:
Charging Power is 11kW on the Wall. Battery still 4°C:
Values: Battery Power – Max. Charge

Start: 0kW – approx. 10kW
10 Sec: 8kW – 8.4kW
30 Sec. 6.1kW – 6.2kW
It stays on this value. Then charging stoped. Max Charge rises within 15 seconds to 8.2kW. After Charging Start, same story again, value decreases to 6kW.

Specially for charging it is a bit puzzling since it seams to self limit the charge power even further, which is not very nice for charging the R90.

But for regeneration I did not find a limitation yet. I’ll test again with 95% SOC, there the limitation should kick in since my downhill will regenerate around 3%SOC. From testing so far I can see 25kW Regen with 4.1kW of Max Charge, which does not match with the Formula stated above. Again, on a R90.

Thank you for your report! The numbers seems to correspond exactly with my findings this morning 🙂

So, the 390 volts seems to be the “trigger” indeed. Learned something new today!

Hello
the test
SOC 95
battery temp 9 degre celsius
max charge/regen power reported by canZE is 5.6 kw
it is a 25 m drop in a 400 meter span
at the top on a hard brake the blue indicator show +13 kw
driving down without touching the brake and speed 50 km/h (around +8kw regen until 3/4 down then the battery voltage reaches 390 V and the regen goes to 7,6,5…)
at the end on the hard brake the blue indicator shows +5 kw.
Don’t know second exactly, it is to many informations for one person driving 🙂