Charging 10%-100% every 3-6 months

[Rolfe]

He didn't give any evidence. I queried it in the comments but I don't think he got back to me. Seems like overkill to me.

 

[Blur]

Has anyone seen any OBD-reported SoH improvements through slow (single phase) 6A charge?
It's Well known way to balance battery More on Jaguar I-Pace to drop power to 6A around 97-99% soc. It does balancing sometimes for 2 to 3 hours until highest cell reaches 4.13V.
Might try on my 2023 with 50000km on it with OBD reported SoH 96.7%

 

[MickeySw]

Has anyone seen any OBD-reported SoH improvements through slow (single phase) 6A charge? Might try on my 2023 with 50000km on it with OBD reported SoH 96.4%

No, but I’m curious to see if an AC charge from below 10% to 100% in one go will indeed change SoH (don’t think to go as low as 6A is actually necessary).

 

[Kithmo]

I managed to calibrate my BMS courtesy of EDF energy Sunday saver. 16 hours of free electric by cutting my peak usage down from 12% to 4% for a week mon-fri. I get about 10% per hour out of my 7kW charger so it took about 9 hours. I used the other 7 hours to top SWMBO's MG5 up.
FWIW, I was looking online for a solution when my new phone kept dying at 30% charge and it seems you can calibrate the battery by flattening it, letting it rest, then charging it to 100% without interruption then leaving the charger on for a couple of hours.
This struck me as very similar to what we are discussing here about calibration of the BMS, so I thought it maybe better to charge it all in one go ?

 

[MickeySw]

I managed to calibrate my BMS courtesy of EDF energy Sunday saver.

Did your SoH change?

 

[Lord Randall]

Regardless, is that terrible if you charge at peak rate for half of a full charge once in 6 month?

I don't know uk electricity market, but in Italy with Octopus peak and of peak rate are just matter of 0,03€ difference.
Even with a way bigger difference we are speaking about 30ish kW/h.

 

[Kithmo]

Did your SoH change?

I didn't check it then, but checking it just now it's 96.8% SOH at just over 2.5 years old and 70% SOC.

 

[Blur]

Has anyone seen any OBD-reported SoH improvements through slow (single phase) 6A charge?
It's Well known way to balance battery More on Jaguar I-Pace to drop power to 6A around 97-99% soc. It does balancing sometimes for 2 to 3 hours until highest cell reaches 4.13V.
Might try on my 2023 with 50000km on it with OBD reported SoH 96.4%

Today I had time to do this "properly":
Soc 46% started single phase charging 32A / 7kW.

14:03 dropped to 6A with SoC 98,7%
14:41 API reports 99,9% SoC
14:48 100%
15:21 99,9%
15:43 100%
16:10 99.6%
16:26 Current drop from 6A to 1-2A and has been doing that for 10min
16:58 charging end, no improvement in SoH.

 

[Griffian]

I last did an equalisation on our ER on 29 December. I used the bump charge, rather than an Ohme scheduled charge and it took 11 hours 45 mins to pull down 73.1 kWh at a cost of £12.35. Its second service is due next week so I'll ask for an SOH figure while I'm there.

 

[MickeySw]

Soc 46% started single phase charging 32A / 7kW.

Don’t think a SoC of 46% is low enough to re-calibrate the BMS, hence SoH did not change?

 

[Blur]

Don’t think a SoC of 46% is low enough to re-calibrate the BMS, hence SoH did not change?

Well did again today from 8% - no change in SoH. So this BMS reported SoH value doesn't actively change as it does in our I-Pace.

 

[MickeySw]

Well did again today from 8% - no change in SoH. So this BMS reported SoH value doesn't actively change as it does in our I-Pace.

Maybe SoH is only changed if there is a significant difference?

Another reason to deep discharge is to force ‘proper’ balancing (according to some opinions) any chance you did look at min/max cell voltages after charging/balancing was finished?

 

[Blur]

Maybe SoH is only changed if there is a significant difference?

Another reason to deep discharge is to force ‘proper’ balancing (according to some opinions) any chance you did look at min/max cell voltages after charging/balancing was finished?

Here screenshot after.

 

[MickeySw]

Here screenshot after.

I have never felt the need to do ‘forced balancing’ as I trust the BMS to take care of it if required, looks like I was right, after 3 years the min/max difference on our MG5 is just 13mV?

Actually there is another ‘theory’ that by deep discharging one can trigger a ‘proper balancing’ which will access the ‘top buffer’ and therefore increase capacity?

Curious, if that’s really the case, @Blur any chance you can post the same screen grab next time you charge to 100% (without prior deep discharging)?