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by sogorman
Mon Sep 03, 2018 10:01 am
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

Just a quick update, my Max Kappa reading is now down to 14.7kWh.

On a side note does anyone know of someone who has had their battery replaced with BMW?
by sogorman
Mon Jul 09, 2018 2:15 pm
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

@gt1 I agree that the Max Kappa. Kwh reading in the diagnostics is only an estimate made by the BMS which is why I did an actual road trip recording distance, consumption, etc... to calculate the actual usable energy details here: https://docs.google.com/spreadsheets/d/1K3tfxXNBYDHnIroQKyG0R_G3-q9Es...
by sogorman
Mon Jul 09, 2018 8:50 am
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

@i3Alan Sounds like we are in the same boat. With the long commutes the further the pack degrades the further the daily DOD (depth of discharge) cycles get... it's a cycle that is self destructive at a certain point. I think I am about 1 year away from a new pack as well which I guess is not all a b...
by sogorman
Mon Jul 09, 2018 5:47 am
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

@Oleksiy you are probably correct. with the low available total capacity (~15.0kWh) and my daily commute (~49Mi round trip) I will be forced to cycle the pack from about 100% - 5% every day in the phoenix heat. To your point whether I want to or not this will accelerate the degradation and the furth...
by sogorman
Sun Jul 08, 2018 2:17 pm
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

@Oleksiy I am sure the cells are not imbalanced, I have had the car at fully charged connected to a L2 for two days before running the first test in my google doc. https://docs.google.com/spreadsheets/d/1K3tfxXNBYDHnIroQKyG0R_G3-q9Es_fJ3cbE8AB8eZI/edit?usp=sharing @alohart and @arodi3 Yes the car wi...
by sogorman
Sat Jul 07, 2018 7:33 pm
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation (20% after 30k miles)

@alohart, yes I know that the Tesla's (S,X,3) not only use active cooling in the case of the i3 but also passive cooling (i.e. the car is 'turned off' and sitting in the parking lot the car will keep the pack temp within specs). I doubt that the pack is just out of balance... I don't see how 20% ran...
by sogorman
Sat Jul 07, 2018 2:00 pm
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

Re: 2015 i3 Battery Degradation

Thanks @theothertom. The Max. Kappa. kWh secret menu is an estimation from the BMS. My reads 14.8 which is inline with my actual measurement. You are correct about the 100k 70% warranty, I guess I am just a bit disappointed at almost 20% capacity / range loss at only 33k miles.
by sogorman
Sat Jul 07, 2018 1:13 pm
Forum: General / Main i3 Owners Forum
Topic: 2015 i3 Battery Degradation (20% after 30k miles)
Replies: 40
Views: 25636

2015 i3 Battery Degradation (20% after 30k miles)

Long time lurker, first time poster. Last week, I picked up a 2015 i3 with 33k miles on the ODO here in Phoenix. I have a 2015 Model S (which is soon to be sold and a 3 in it's place) that my wife and I share and I wanted an EV for my daily commuter into work. I love the interior of the i3 and while...

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