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 Post subject: Charging curve on 2016 vs. 2019
PostPosted: Mon Jan 07, 2019 8:10 am 
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Joined: Sat Dec 05, 2015 5:18 pm
Posts: 38
Location: Sunnyvale, CA, US
Charging to the old 2016 e-Golf, I saw a characteristic curve where the car gradually accepted less power in the last 10 minutes as it approached 100% SOC. Filling up the 2019, it looks like the car doesn't ramp down, but goes straight to 0. I'm curious why I'm seeing this behavior?

Below I have URLs from to screenshots from my JuiceBox app that show these charging curves (I can't seem to make the IMG tags work in the forum).

2016 e-Golf:
https://photos.google.com/share/AF1QipOvqbH6mplEiBL8wYLOscgEWmPxeTuxQs9FIrVPMTJGIF8ylPqSDYKYD9AZy9Dscw/photo/AF1QipNWNcjPX3DSjSbyeQwsMOJMPXzvxPfgZXbvt1SK?key=d0F1UGhDdkNWYzlkSm1Nd0tEOWNLNC1aZmlCdDRR

I've only charged the 2019 e-Golf to 100% twice, once from the DCFC at the dealer's. Below is the charging curve recorded at home:
https://photos.google.com/share/AF1QipOWZupqgFH4GLwMEqJHazY2KJ_N2oVhrPg46V212vCyb7wi9Yub0L9Mo577IQGzpQ/photo/AF1QipPEQQ_xeQK-9I9QLA81D-G9JnKVTebJsLRVmlNW?key=bjFRV29pOVREd25SQnBtTkFaMDhqaUdMTWRXcFZn

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VW e-Golf 2019 SE (current) / 2016 SE +DCP (returned 12/2018)
2003 Toyota Prius


Last edited by DepletedZPM on Mon Jan 07, 2019 10:54 am, edited 1 time in total.

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 Post subject: Re: Charging curve on 2016 vs. 2018
PostPosted: Mon Jan 07, 2019 8:46 am 
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Joined: Thu May 03, 2018 4:04 pm
Posts: 33
My 2017 doesn’t taper at all when charging at home (7kW).

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2017 e-Golf


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 Post subject: Re: Charging curve on 2016 vs. 2018
PostPosted: Mon Jan 07, 2019 10:00 am 
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Joined: Mon Nov 02, 2015 2:32 pm
Posts: 640
Location: Santa Cruz, CA
Can't comment on the e-Golf specifics, but just saw on the Facebook group some i3 owners are seeing the same thing comparing their 2019 40 kWh batteries vs. older models. My 2016 SE certainly tapered, as does my 2018 i3.

Guessing it's something related to newer battery technology?

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2016 e-Golf SE in Urano Grey leased 8/1/2016 for $1500 down + $50 x 24 months * Purchased 7/31/2018 * ChargePoint Home 32a (wired)
2018 BMW i3s REx in Mineral Gray purchased 6/12/2018 w/ Giga, Tech, Parking, CarPlay, Harmon Kardons, and of course Moonroof


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 Post subject: Re: Charging curve on 2016 vs. 2018
PostPosted: Mon Jan 07, 2019 10:24 am 
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Joined: Fri Jan 23, 2015 1:18 pm
Posts: 421
I have also noticed no AC taper on my 2017. My guess is there is more buffer at the top of the SoC, so when the indicated 100% is reached, the real pack SoC is more like 90 to 95% (?) and the charge rate does not need to taper to protect the battery. On the 24 kWh pack, for the car to get the promised range, I'm guessing VW had to have a smaller buffer at the top of the SoC, so a taper was required to protect the chemistry.

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2017 e-Golf LE, Multi Coat White with Black Vegan Leather interior


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 Post subject: Re: Charging curve on 2016 vs. 2018
PostPosted: Tue Jan 08, 2019 11:00 am 
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Joined: Fri Mar 27, 2015 4:13 pm
Posts: 1260
Location: Los Altos, CA
f1geek wrote:
I have also noticed no AC taper on my 2017. My guess is there is more buffer at the top of the SoC, so when the indicated 100% is reached, the real pack SoC is more like 90 to 95% (?) and the charge rate does not need to taper to protect the battery. On the 24 kWh pack, for the car to get the promised range, I'm guessing VW had to have a smaller buffer at the top of the SoC, so a taper was required to protect the chemistry.

^ This. Agree 100%

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2015 e-Golf LE (returned) | 2018 Tesla Model 3 LR | 2012 RAV4 EV Shoreline w/JdeMO | Leviton EVB40 & Jesla Home Charging | 4.32kW Motech/Enphase PV + 2x Powerwall 2 AC


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