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 Post subject: Re: Battery degradation
PostPosted: Fri Jul 12, 2019 10:09 am 
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Joined: Fri Jul 12, 2019 10:06 am
Posts: 1
Sparklebeard wrote:
Do you have OBD11? Based on another thread on here I did some digging and I'm currently trying to figure out the Wh figures listed on module 19.

There's some speculation that the SOH_Q and SOH_P figures somehow tie into battery degradation. I did some math here based on my cars, extrapolating out from the figures I saw listed in OBD11.

The math here seems to work out to suggest that the cars leave the factory with about 90% of the battery available for use when 'fully charged' on the battery gauge. The "Energy storage unit SOC" strongly seems to be listing the vehicles current state of charge in Wh, and this was supported not just through the math working but also observing the figure drop 300Wh (in 100Wh increments) over some period of time with the car running and me monitoring figures in OBD11.

The HV battery charge state figure matches the figure shown in CarNet, so this must be the "user facing" SOC, not the absolute cell SOC.

2019
(12/18 build plate)
2852 mi
Energy storage unit SOC: 15475 Wh
HV battery Charge State: 49.0
SOH_Q: 97%
SOH_P: 97%

[Calculated usable capacity today]: 31581 Wh (15475/49*100)
[Calculated usable capacity at factory]: 32558 Wh (31581/97*100)

2016
(08/16 build plate)
26,154 mi
Energy storage unit SOC: 15000 Wh
HV battery Charge State: 80.0
SOH_Q: 87%
SOH_P: 87%

[Calculated usable capacity today]: 18750 Wh
[Calculated usable capacity at factory]: 21551 Wh


Anyone else with OBD11 or VCDS please feel free to add your figures to this, it would be great if we did find a way to diagnose battery health without relying on the trip computer.




I have a Bluetooth OBD11 Reader. How do you find that data?


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 Post subject: Re: Battery degradation
PostPosted: Fri Jul 12, 2019 10:38 am 
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Joined: Mon Oct 05, 2015 2:01 pm
Posts: 2361
sham wrote:
Sparklebeard wrote:
Do you have OBD11? Based on another thread on here I did some digging and I'm currently trying to figure out the Wh figures listed on module 19.

There's some speculation that the SOH_Q and SOH_P figures somehow tie into battery degradation. I did some math here based on my cars, extrapolating out from the figures I saw listed in OBD11.

The math here seems to work out to suggest that the cars leave the factory with about 90% of the battery available for use when 'fully charged' on the battery gauge. The "Energy storage unit SOC" strongly seems to be listing the vehicles current state of charge in Wh, and this was supported not just through the math working but also observing the figure drop 300Wh (in 100Wh increments) over some period of time with the car running and me monitoring figures in OBD11.

The HV battery charge state figure matches the figure shown in CarNet, so this must be the "user facing" SOC, not the absolute cell SOC.

2019
(12/18 build plate)
2852 mi
Energy storage unit SOC: 15475 Wh
HV battery Charge State: 49.0
SOH_Q: 97%
SOH_P: 97%

[Calculated usable capacity today]: 31581 Wh (15475/49*100)
[Calculated usable capacity at factory]: 32558 Wh (31581/97*100)

2016
(08/16 build plate)
26,154 mi
Energy storage unit SOC: 15000 Wh
HV battery Charge State: 80.0
SOH_Q: 87%
SOH_P: 87%

[Calculated usable capacity today]: 18750 Wh
[Calculated usable capacity at factory]: 21551 Wh


Anyone else with OBD11 or VCDS please feel free to add your figures to this, it would be great if we did find a way to diagnose battery health without relying on the trip computer.




I have a Bluetooth OBD11 Reader. How do you find that data?


It's probably available if you have a Ross-tech VCDS USB hex cable and software, available from Ross-tech, for a price.

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2015 e-Golf SEL
2015 Passat TDI SEL
2014 Touareg TDI LUX

Full spectrum VW owner, life is too short to wait to drive for a recharge.


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 Post subject: Re: Battery degradation
PostPosted: Fri Jul 12, 2019 11:05 am 
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Joined: Wed Oct 03, 2018 10:45 am
Posts: 241
Location: Bay Area, CA
I wouldn’t go with a Ross tech interface at this point; you can get the same functionality for less with OBDeleven.

I don’t think a generic OBD reader can read the number 19 gateway status channels.

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⚡️2019 e-Golf SEL in Indium Gray ⚡️ (The Handsome Boy 1.1)


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 Post subject: Re: Battery degradation
PostPosted: Mon Jul 15, 2019 7:58 am 
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Joined: Wed Jul 10, 2019 10:25 am
Posts: 9
Sparklebeard wrote:
I wouldn’t go with a Ross tech interface at this point; you can get the same functionality for less with OBDeleven.

I don’t think a generic OBD reader can read the number 19 gateway status channels.


What does that mean? If I want to purchase OBDII, what should I look for?

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2016 e-Golf SE - Night Blue Metallic


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 Post subject: Re: Battery degradation
PostPosted: Mon Jul 15, 2019 10:08 am 
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Joined: Tue Jul 11, 2017 10:56 am
Posts: 197
Generic OBD2 is a bluetooth enabled reader that you'll generally find on Amazon, etc. that allows you to scan codes, etc. using apps.

OBDEleven is a bluetooth enabled reader and app that is specific to VAG vehicles that allows you to do the above as well as program customizations, etc.

Ross tech = VAG COM has been around a long time and includes a cable and software for a laptop that does what OBDEleven can do and more such as live data logging. OBDEleven is the cheaper alternative to Ross tech and does what most users want/need at a fraction of the cost.

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2019 e-Golf SE, Pure White w/ DAP and deAutoLED H7RC HID's
2016 e-Golf SE, Pure White w/ Ed's Golf R Replica HID's (SOLD)


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