OBD to track Battery SOH?

[Dragon Tourniquet]

3 weeks old Macan 4. Mileage = 1831km
Just gotten my OBD. Forgotten to capture a screenshot.
Maximum energy content of the traction battery = 94300Wh
HV battery energy content = 39875Wh

From the vehicle dashboard showing SOC = 46%.
If we calculate from this information, it means at 100% the energy content = 39875/0.46 = 86685Wh.

An if we take the Max = 94300Wh, it calculated that the SOH is only = 92%.
Does this mean that 3weeks, Mileage = 1831km, the SOH dropped 8%.

How to interpret the measurement?

Unfortunately that's not quite accurate, because the SOC displayed is calculated after a percentage of the battery is reserved to keep it healthy. I'm not sure if that percentage has been made public, but previously Audi had been using 5% on the e-Tron.

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[craz8]

The problem with comparing kwh stored and SOC as a percent is that the SOC is a calculated value, using the voltage of the battery and some clever math to estimate the stored power, where the kwh stored is a fixed amount, but hard to measure directly without taking out that power.

I don't know if you've noticed that the SOC % drops 1-3% as soon as you unplug from a charger and drive away - this is because the charger needs to provide a higher voltage to move the current into the car, so the % calculation gets confused for a short time, and as it works out the actual battery voltage, the SOC drops too.

There's also the problem of the voltage dropping as soon as it's under load, which we've all seen with 12v batteries that can show enough voltage until you use them and it drops enough your starter motor can't get enough current!

So the SOC % isn't an accurate enough number to do this calculation with and get sensible results.

 

[PrudentOcean]

California is considering making the battery SoH information accessible to EV car owners. This would become a requirement starting in 2026. I believe Porsche already has the information and is just not exposing it, so they could provide a software update to display this information on all Macan EVs.

 

[Yves]

Unfortunately that's not quite accurate, because the SOC displayed is calculated after a percentage of the battery is reserved to keep it healthy. I'm not sure if that percentage has been made public, but previously Audi had been using 5% on the e-Tron.

The pack is 100kwh with 94kwh usable energy, that is what officially is communicated, so …
Either Porsche is low balling the content on purpose, and hopefully we get a bump in range after the first update and they have learned to better manage the battery …
Or we have been short sold the real Bruto and Net capacity and we should go to court ?

 

[Mavshyn]

The pack is 100kwh with 94kwh usable energy, that is what officially is communicated, so …
Either Porsche is low balling the content on purpose, and hopefully we get a bump in range after the first update and they have learned to better manage the battery …
Or we have been short sold the real Bruto and Net capacity and we should go to court ?

Hopefully not the last. lol

 

[ex725]

Hi everyone,

I know this is an older thread, but I wanted to check if there have been any updates.

Has anyone successfully integrated the Porsche Macan Electric (Macan 4) with ABRP via OBD2? Specifically, has anyone managed to read live data such as SOC, battery power, voltage, or even SOH using Car Scanner or directly in ABRP?

I’m using a Vgate iCar Pro BLE dongle, but ABRP does not seem to receive any live data from the vehicle. Even in Car Scanner, I’m not consistently getting usable battery parameters.

If anyone has managed to make it work, could you please share:


Thanks in advance!

 

[Yves]

If anything after the last update of the Macan the values make even less sense in Car Scanner … there is nothing useful to be gathered anymore

 

[ADS]

Note that when Porsche validates the SoH of the battery they don't use a snapshot from the OBD but rather drain to zero, charge to 100% and then (I think) drain to 0 again. They did this to check my battery and it was a few day process. Given the extra time and work required to do this, this implies to me that spot readings via OBD are probably not reliable.

 

[SergeyIndy]

Note that when Porsche validates the SoH of the battery they don't use a snapshot from the OBD but rather drain to zero, charge to 100% and then (I think) drain to 0 again. They did this to check my battery and it was a few day process. Given the extra time and work required to do this, this implies to me that spot readings via OBD are probably not reliable.

That is correct as far as the official dealer process. However, OBD spot on readings are highly accurate and we have proved this many times over on the Taycan forum. However, unless someone confirms this with real world data for the Macan EV, the accuracy of long process vs. spot on readings cannot be assumed.

 

[ex725]

Thank you all for the updates.


For me, this is extremely important. I am based in Turkey and unfortunately Porsche Connect services are not working here, so I do not have access to remote vehicle data or official telematics integration.


Because of that, I was really hoping to at least use OBD to retrieve live data (SOC, battery power, etc.) and integrate it with ABRP for proper route planning.


At the moment, without Porsche Connect and without working OBD access, this situation has become very difficult and almost impossible to manage properly for long trips. Accurate route planning is critical, especially when charging infrastructure planning depends on precise SOC data.


If anyone has managed to get stable OBD data from the Macan EV — even partial data — I would greatly appreciate any guidance. Even basic SOC access would already make a big difference for me.

 

[EVowner]

Note that when Porsche validates the SoH of the battery they don't use a snapshot from the OBD but rather drain to zero, charge to 100% and then (I think) drain to 0 again. They did this to check my battery and it was a few day process. Given the extra time and work required to do this, this implies to me that spot readings via OBD are probably not reliable.

Process that you describe is considered to be more accurate as it forces also battery modules to rebalance which can show real battery capacity instead of skewed one hence many owners believe that doing this on your own on regular basis is a good idea. I was told that this measurement is paid service due to the amount of time that they need to spend to discharge, do 12 hour wait, charge and do another 12 hour wait.

Whole procedure for Taycan which I believe is the same for Macan is described here.

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