noakey
Posts: 398
Joined: Mon Jan 27, 2014 8:11 am
Location: Swindon UK

Weather change... reduced range

Mon Oct 13, 2014 3:27 pm

Hi all..

Just wanted to share my observations re my BEV... All driving below is done on ecopro.

My normal daily commute is a total of 60 miles, and I always return home with about 30 miles range left, indicating a total range of 90 miles on my charge. Its always been dry, light and no air-con, with cabin heating at 19celcius.

Today it was dull and raining and cold and steamy.. so the same commute now included headlights, wipers and air con. I returned home with 10 miles range remaining... or a range of 70 miles.

So the headlights, wipers and aircon in total consumed 20 miles of range over a 2 hour period...

Just saying...
Last edited by noakey on Tue Oct 14, 2014 12:33 am, edited 1 time in total.
Neil

BEV at 21,000 miles in first 16 months.
Average 86 miles per charge.
Best on full charge 112miles, worst on full charge 55miles
Loving every mile :)

Shrink13
Posts: 47
Joined: Fri Sep 19, 2014 11:02 am
Location: Palo Alto, CA

Re: Weather change... reduced range

Mon Oct 13, 2014 6:52 pm

You have to take into account the ambient temperature. The colder it is outside, the less miles you will get on each charge. The use of the accessories further reduces the range.

WoodlandHills
Posts: 751
Joined: Mon Sep 15, 2014 4:50 pm
Location: SoCal

Re: Weather change... reduced range

Mon Oct 13, 2014 8:47 pm

That's about what I get here in Los Angeles with the a/c on constantly. My default driving mode is Eco Pro for the soft throttle, but with the climate control set to Comfort in the iDrive. If I run with everything in Comfort it drops even more, still with the REx I don't really worry. As summer turns to fall here, (it was 97/36 today) I hope to be able to drive in full Eco plus and see what kind of range we get.
Clipper Creek HCS-40P 32a EVSE
2014 REx Arravani Grey Giga all options
2008 Infiniti EX35
2008 smart ForTwo Cabriolet
2000 F-250 Powerstroke
2006 Westfield eleven
1984 Laverda RGS-1000

Plug
Posts: 259
Joined: Fri Aug 02, 2013 1:17 pm
Location: UK

Re: Weather change... reduced range

Mon Oct 13, 2014 10:55 pm

noakey wrote:So the headlights, wipers and aircon in total consumed 20 miles of range over a 2 hour period...
Yep, and we can expect that range to drop further when winter really sets in.

On Sunday night I drove the 200'ish miles back from parents which is something I've already done several times in my i3 and I usually arrive back with plenty of juice in the tank (after a fill-up midway). This time it was noticeably colder and as I was getting closer to home I realised it was going to be quite tight and I arrived with 9 miles remaining. It looks like, when the temps start dropping, I'll be having to slow down a bit from the 75mph that I set the cruise at.

amateurish
Posts: 102
Joined: Mon Dec 16, 2013 9:10 am
Location: MK, UK

Re: Weather change... reduced range

Tue Oct 14, 2014 12:45 am

I've got a 62 mile commute. In the summer I could comfortably do this with 30% range left. So about 90 miles range.

Last night the weather was appalling - very heavy rain. Not too cold though.

I managed to get 60 miles before the Rex kicked in. And the traffic was heavy so driving slower than normal.

elptex
Posts: 215
Joined: Tue May 06, 2014 1:44 am
Location: Henley On Thames UK

Re: Weather change... reduced range

Tue Oct 14, 2014 2:04 am

The weather has definitely turned in the UK. The past couple days we have had about 10% less battery remaining when getting home. Our round trip is 74 miles, of which 37 miles is on the motorway and we set cruise to 60mph (if possible, usually traffic is going more like 50-55).

We find that we have to run the air just to keep the windows from fogging up. Temperature-wise we are fine/comfortable, air is on solely to keep the windows clear.

There was discussion somewhere where people concluded that heated seats are generally more energy efficient than heated air for the reason that seats heat just you versus the whole cabin for air.
Avg ~72 mile/charge over ~9k miles

DAZ
Posts: 66
Joined: Sat Sep 13, 2014 8:55 pm
Location: Chester, Virginia

Re: Weather change... reduced range

Tue Oct 14, 2014 6:54 am

:) Too new to the i3, but with my Prius Plug In, with the drivers heated seat on, no noticeable effect on the 10 mile EV range. Heated seats for the i3 as a $350 option is a bargain.
2014 BMW i3 BEV
09/19/14
2012 Prius Plug In
01/22/13
Leviton 40a 9.6kWh EVSE
REVOLTN

Boxbrownie
Posts: 87
Joined: Sat Sep 06, 2014 10:21 am
Location: Pastyland, UK

Re: Weather change... reduced range

Tue Oct 14, 2014 6:56 am

elptex wrote:
There was discussion somewhere where people concluded that heated seats are generally more energy efficient than heated air for the reason that seats heat just you versus the whole cabin for air.
So you get a comfy warm bum but crash into everything in front of you! :D

I think for sure the heated seats will be more efficient at keeping bodies warm, and would imagine that running the fan on max/window instead of AC the same might be more economical?
Best regards........David

If anything in my post offends you please let me know, I may wish to offend you again. ;)

i3an
Posts: 120
Joined: Tue Oct 14, 2014 1:09 pm
Location: San Francisco

Re: Weather change... reduced range

Tue Oct 14, 2014 1:26 pm

Rain, I suspect, is the main culprit in range loss during foul weather, more so than cold or humidity. Most ICE drivers won't notice it (because they're not looking out for it), but I have driven a Honda Insight, with hard narrow skinny tires, since the dawn of the century, and it absolutely struggles in the rain and fuel consumption rises steeply. I suspect what I call micro hydroplaning - constant slight slippage where the rubber hits the puddle. Even deflating the tires back down to factory specs makes no difference. Haven't driven the i3 in the rain yet — we are in the midst of a historic drought, after all — but I expect the same effect.

noakey
Posts: 398
Joined: Mon Jan 27, 2014 8:11 am
Location: Swindon UK

Re: Weather change... reduced range

Tue Oct 14, 2014 2:01 pm

i3an wrote:Rain, I suspect, is the main culprit in range loss during foul weather, more so than cold or humidity. Most ICE drivers won't notice it (because they're not looking out for it), but I have driven a Honda Insight, with hard narrow skinny tires, since the dawn of the century, and it absolutely struggles in the rain and fuel consumption rises steeply. I suspect what I call micro hydroplaning - constant slight slippage where the rubber hits the puddle. Even deflating the tires back down to factory specs makes no difference. Haven't driven the i3 in the rain yet — we are in the midst of a historic drought, after all — but I expect the same effect.
Well today, dull with little standing water. . Headlight on.. Ac on... heating on 19celcius.. wipers on auto cos it was raining light and on ecopro I had 80 mile range... so the only differing factor really was standing water... i suspect the drag is pretty significant.
Neil

BEV at 21,000 miles in first 16 months.
Average 86 miles per charge.
Best on full charge 112miles, worst on full charge 55miles
Loving every mile :)

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