Is there a way to read battery state in kWh?

[haloweenhamster]

Is that a calculated value of an actual value from the car? I'd be surprised if you can get more info from the API than via OBD

 

[nanomad]

Is that a calculated value of an actual value from the car? I'd be surprised if you can get more info from the API than via OBD

I wrote the code

The API reports all cars having a 72.5kWh battery capacity and all kWh mesures reported are referring to that capacity. My code then rescales those to the net battery capacity published by MG for that specific model

 

[wattmatters]

Is that a calculated value of an actual value from the car? I'd be surprised if you can get more info from the API than via OBD

As that's been answered (i.e. the integration calculates it) for interest I thought I'd show sample charts for SOC% and kWh remaining over past 30 days:

Essentially identical, which is to be expected when one is simply a factor of the other.

 

[Everest]

Essentially identical, which is to be expected when one is simply a factor of the other.

I wonder if the car's BMS also takes SOH into account and/or whether it actually measures the supplied charge via its coulomb counter and performs some re-calibration reset when 100% is reached or a specific cell voltage?

 

[wattmatters]

and performs some re-calibration reset when 100% is reached or a specific cell voltage?

Most BMSs will do a full charge recalibration based on certain charge criteria being met, usually that a given voltage has been sustained for a minimum period of time while the charge current has tailed off below a threshold level.

 

[fourevah]

kWh remaining is reported by the SAIC API. It's an entity in the Home Assistant integration.

View attachment 32602

Ooh! Need to investigate this

 

[tikel]

kWh remaining is reported by the SAIC API. It's an entity in the Home Assistant integration.

View attachment 32602

I have SE LR MY23 (64 kWh) and my SoC and SoC_kWh in Home assistant calculates kWh as if I have 51kWh battery.
Can this be fixed so it shows correct value?

 

[wattmatters]

Can this be fixed so it shows correct value?

That's one for @nanomad I think.

 

[nanomad]

I have SE LR MY23 (64 kWh) and my SoC and SoC_kWh in Home assistant calculates kWh as if I have 51kWh battery.
Can this be fixed so it shows correct value?

Sure, get in touch with me in pvt here on the forum, I'll need some debug info to distinguish that model variant

 

[tikel]

Sure, get in touch with me in pvt here on the forum, I'll need some debug info to distinguish that model variant

Hi, I send you a PM few days ago.
But we can continue here if you wish.

What do I need to do to give you debug info you need?

 

[nanomad]

Hi I was out of home for the last few days, I'll follow-up in pvt

 

[nanomad]

0.7.0-rc9 onwards will report 64kWh for MG4 with a low trim level and a configurable SoC target in the app. That's unfortunately the best I can do since MG re-used the same model code between the 51 and the 64 versions

 

[tikel]

btw.
I had configurable SoC target from start in SAIC integration.

 

[nanomad]

Yeah, that was correctly using the same "feature gate" the official app is using

 

[NLMGSAN]

kWh remaining is reported by the SAIC API. It's an entity in the Home Assistant integration.

View attachment 32602

If SOC is 80% when it has 51.2 kWh charge, then 100% SOC=64 kWh. But that cannot be correct. The real max of an LR is 61.7 kWh, right?

 

[wattmatters]

The real max of an LR is 61.7 kWh, right?

My spec sheet says a nominal capacity of 64 kWh and a useable capacity of 62.1 kWh.

 

[NLMGSAN]

My spec sheet says a nominal capacity of 64 kWh and a useable capacity of 62.1 kWh.

Could be. I used this: https://ev-database.org/car/1708/MG-MG4-Electric-64-kWh

But whatever the correct value: it isn't 64 kWh.

 

[wattmatters]

But whatever the correct value: it isn't 64 kWh.

It has a nominal 64 kWh capacity. That you may not be able to access all of it doesn't make it wrong.

 

[NLMGSAN]

True. But the way the OP stated his question I would interpret it as usable capacity.

 

[Kithmo]

Does the usable capacity have a buffer at both ends or could it be just the bottom though ?
If it's at the bottom end, to prevent complete discharge, then it could be 64kWh at 100%