jadnashuanh
Posts: 4199
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: 2015 i3 Hold SOC charge not what it seems?

Thu Oct 04, 2018 9:47 pm

Drag is probably the biggest power hog aside from climbing hills or accelerating.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

nickp
Posts: 34
Joined: Tue Oct 02, 2018 7:40 am

Re: 2015 i3 Hold SOC charge not what it seems?

Fri Oct 05, 2018 9:07 am

jadnashuanh wrote:Drag is probably the biggest power hog aside from climbing hills or accelerating.


Yes that makes sense. So this weekend I am going to drive to Orange County on the 405 fwy and will hold SOC. I will come back with the results.

tjburbach
Posts: 36
Joined: Fri Oct 13, 2017 7:28 am
Location: Austin, TX

Re: 2015 i3 Hold SOC charge not what it seems?

Fri Oct 05, 2018 2:20 pm

I will be interesting to see what the results are. I'm kind of curious what sort of issues the i3 will begin to run into as they age.
-Tim

PBNB
Posts: 15
Joined: Sat Jul 21, 2018 11:28 am
Location: Vancouver, BC

Re: 2015 i3 Hold SOC charge not what it seems?

Sun Oct 07, 2018 7:56 am

tjburbach wrote:I will be interesting to see what the results are. I'm kind of curious what sort of issues the i3 will begin to run into as they age.
-Tim


I just coded mine last night so I will also be watching the range. I did notice a huge drop in the range just by having the heat on over the last few charges. It looks like about a 25% drop so I am now trying to use just the seat heaters to see if I can get the battery range back to where it was.
2015 i3 REX

jadnashuanh
Posts: 4199
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: 2015 i3 Hold SOC charge not what it seems?

Sun Oct 07, 2018 11:48 am

The REx's cabin heating uses a resistance heater...IOW, 1w from the battery produces 1W of heating. The BEV uses a heat pump, so 1W from the battery can produce up to about 4W of heat, depending on the outside temperature and how efficient it can be. The colder it is, the less efficient it is at pulling heat from outside via the heat pump until, eventually, if it's cold enough, it may end up using the same heating as the REx. So, yes, cabin heating will use a lot more battery power in a REx than in a BEV under normal circumstances.

If you will need to warm up the cabin for a trip, it really does help to do it via the app while connected to an EVSE with setting a departure time (or, do it from the car's menu). This not only warms (or cools in the summer) the cabin, but also conditions the batteries. Both versions use an electric heating system to warm the batteries if set for preconditioning when required.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

nickp
Posts: 34
Joined: Tue Oct 02, 2018 7:40 am

Re: 2015 i3 Hold SOC charge not what it seems?

Wed Oct 10, 2018 9:38 am

OK so this last Saturday I went from Torrance, CA to Mission Viejo on the 405 fwy which is much of a flat freeway. I held SOC with 51 miles remaining on the EV and after my trip ended I was left with around 13 miles of gas and 44 miles on the EV range.
I guess this is more normal than my other experience. I was a bit worried if the gas was leaking etc. So looks like all's well :)

bwilson4web
Forum Supporter
Posts: 608
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: 2015 i3 Hold SOC charge not what it seems?

Mon Oct 15, 2018 3:17 am

Using Google Earth Pro:

Image

Do a CNTL+click on the route and you'll get the elevation profile.

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

JohnKelly
Posts: 32
Joined: Sat Oct 07, 2017 7:02 am

Re: 2015 i3 Hold SOC charge not what it seems?

Mon Oct 15, 2018 4:11 pm

That's a cool feature, Bob. I wish regular google earth had it.
2015 REX / Participating on plugshare w/level 2 Clipper Creek 32 amp, Moclips, Washington coast

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