mlsstl
Posts: 15
Joined: Sun Apr 05, 2015 7:33 pm

How often to recharge?

Mon Apr 06, 2015 2:28 pm

First time poster here. We are considering an i3 to replace our Mini Clubman. In looking at our lifestyle, we are mainly urban drivers -- I've got a 7 mile round trip to work and drive maybe 30 miles a day at most, while my wife has averaged 25 miles a day over her last 5 years in the Mini. (And our other car is a Subaru Outback, so we are well equipped for our road trips.)

I've looked around the forum and haven't seen this question specifically addressed, so apologies if it is a repeat.

If the car has been driven lightly on a given day and still has plenty of range for the next day or two's anticipated outings, is it better to go the extra day or two without recharging or is it OK to do nightly? With batteries, I'd like to maximize its long-term life. I'm trying not to to get hung up with old beliefs about the batteries used in these cars.

Sparky
Posts: 360
Joined: Fri Nov 21, 2014 2:30 pm
Location: Bay Area, Northern California

Re: How often to recharge?

Mon Apr 06, 2015 2:39 pm

I've read posts about trying to maintain the charge level between to points, but I don't bother. I plug in my car after every outing so I know I've got full range. Btw, mine is a rex, but I still always charge.

cove3
Posts: 146
Joined: Thu Jul 03, 2014 10:06 am
Location: White Plains, NY

Re: How often to recharge?

Mon Apr 06, 2015 2:48 pm

Everything I've read said to keep the charge between 20-70% unless you need the full range for a trip the next day. This presumably will maximixe the life/capacity

Ron
2015 e-Golf SEL Limestone Gray
1988 528e, 1992 525i
Previous: 3.0CS, 2800CS, 2002

justanotherdrunk
Posts: 265
Joined: Thu Feb 19, 2015 9:56 am
Location: Silicon Valley

Re: How often to recharge?

Mon Apr 06, 2015 3:21 pm

Sparky wrote:I've read posts about trying to maintain the charge level between to points, but I don't bother. I plug in my car after every outing so I know I've got full range. Btw, mine is a rex, but I still always charge.
+1
2014 i3 BEV
Solar Orange/ Mega

jadnashuanh
Posts: 4986
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: How often to recharge?

Mon Apr 06, 2015 4:17 pm

The car automatically prevents you from fully charging the batteries, and won't let you fully discharge them...personally, I don't worry about it finding the warranty and the ability to have the maximum range available, should my plans change. Also, if you have it plugged in, you can condition the interior (and batteries if you want) so the car is comfortable when you get into it without compromising range. This can be a big thing if you live where it gets quite cold in the winter. The ONLY way to condition the batteries is to have it plugged in and set a departure time greater than 3-hours from the current time. When doing that, you can also have it precondition the interior.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above

I33t
Posts: 894
Joined: Fri Dec 13, 2013 3:01 pm
Location: Australia

Re: How often to recharge?

Mon Apr 06, 2015 4:22 pm

+1

My daily range is similar, maybe a bit less. 30-50km and a few days a week with short 10km or no trips.

I charge to full, then I don't recharge it until I know my range is getting close to my next days trip. If I'm not sure of my trip tomorrow and my battery level is under 50%, I charge it anyway so I don't have a concern about range.

Charging to 70% would be reasonable for my use, but there is no automated method for this on the car or charger. It would mean more frequent charging for my use though. BMW makes no mention of it in the manual, but they reserve some battery capacity to protect the battery from overcharge or depletion. I think if it was important for the i3 battery, they would have made these allowances, they haven't.

To make it easy to charge to 70%, you'd need charger control. I think the top model Juicebox would be the only one with this capability. You'd have to work out how many KWh it will take to bring the i3 up to 70% and then dial that into the Juicebox. No way I'm getting up at silly hours in the morning to turn off the charger at 70%!

Unless BMW make provisions in the software to limit charging to 70% capacity I can't see a reasonable user-friendly way of implementing it, so even though it appears to be a reasonable idea I'm passing on that one.
2014 BMW i3 BEV deposit placed 19th Dec 2013
Delivered in Melbourne 4/12/2014. Arrived locally 11/12/14, with 24km on the clock.

nowtta60
Posts: 182
Joined: Sun Aug 03, 2014 10:15 am
Location: Staffordshire, UK

Re: How often to recharge?

Mon Apr 06, 2015 4:27 pm

A rough workaround to this is set the time to use off peak charging - and tell it off peak starts a hour before you leave. On a 7kW charger - you'll get about 7kWh in 1 hours charging ;-)

Personally at the weekend I don't bother plugging in as I only do about 50 miles here and there, but Sun-Thu night is a full charge with precon for an early start on cold mornings :(
i3 REX Ordered 06/08/14. Collected 27/01/15
Capparis White, 429s, Loft, Park Assist, Winter Pack, Professional Media, Drive Assist Plus, DC Prep, LED headlamps.
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I33t
Posts: 894
Joined: Fri Dec 13, 2013 3:01 pm
Location: Australia

Re: How often to recharge?

Mon Apr 06, 2015 4:34 pm

nowtta60 wrote:A rough workaround to this is set the time to use off peak charging - and tell it off peak starts a hour before you leave. On a 7kW charger - you'll get about 7kWh in 1 hours charging ;-)
And if I don't know when I'll be leaving? Or if I need more than an hour to bring it to 70% I have to faff about in the menus on a frequent basis?

Nope :)
2014 BMW i3 BEV deposit placed 19th Dec 2013
Delivered in Melbourne 4/12/2014. Arrived locally 11/12/14, with 24km on the clock.

mlsstl
Posts: 15
Joined: Sun Apr 05, 2015 7:33 pm

Re: How often to recharge?

Mon Apr 06, 2015 7:08 pm

Thanks for the comments. Sounds like, with the battery overcharge and run-dry protection that BMW has built in, the best route is just to charge the car when one has the opportunity to use a plug and not worry any further about it.

MikeS
Posts: 713
Joined: Thu Jan 16, 2014 8:29 am
Location: Brighton UK

Re: How often to recharge?

Mon Apr 06, 2015 11:48 pm

mlsstl wrote:Thanks for the comments. Sounds like, with the battery overcharge and run-dry protection that BMW has built in, the best route is just to charge the car when one has the opportunity to use a plug and not worry any further about it.
+1
BMW 3 Series 2005 - Aug 2014
BMW Z4 35i 2009 - Mar 2014
BMW X1 Mar 14
BMW i3 Sep 14

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