helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

i3 94ah range at highway speed

Wed Feb 15, 2017 5:13 pm

Hi! Need a little help here from the experience of 94ah i3 owners. Undecided to trade my 60ah BEV for the BEV or the Rex version of the 94ah i3.

Need help from your experience of what is the real range at highway speed ranges (for 60-62, 70 or/and 75mph) in winter/summer.

Particularly, we'll have this occasional 113 mile commute, mostly in highway. is it realistically feasible with pure electric 94ah i3? I mean, with highway speeds (let's say at least 62mph) even in winter ?
Last edited by helderaguiar on Thu Feb 16, 2017 1:45 pm, edited 1 time in total.

jadnashuanh
Posts: 5177
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: i3 94ah range

Wed Feb 15, 2017 7:13 pm

Depends...preconditioning can help, outside temperature will be a big player (more so than the BEV) since any heat comes directly from the battery on a one-to-one basis while the BEV uses a heat pump with as much as a 3+ to one advantage. You should easily make it with a little REx usage, and might make it on battery alone in the summer, but I would have my doubts about in the winter unless you live somewhere that doesn't get cold.
Jim DeBruycker
2014 i3 BEV, 2021 X5 45e
(The i3 will be sold soon, <17K-miles, interested?)

helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

Re: i3 94ah range

Thu Feb 16, 2017 7:26 am

Hi!

We live in the north of Portugal, in winter we usually have 35-45ºF at morning and evening,

So the 94ah BEV probably capable of a 110 mile trip at 55-50 mph in Eco Pro + with these Temp ?

helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

Re: i3 94ah range

Thu Feb 16, 2017 1:20 pm

Today I drove one 94ah BEV through the BMW local dealer.

Drove 94km (59 miles) mostly in highway at 90-100km/h (56-62 mph) with Eco Pro+ mode. Today we had a good weather, it was sunny, not windy, and about 15ºC (59ºF).

Battery usage was 40.0%. Range estimator showed 139km (87 miles) for the remaining battery (60.0%).

So for this kind of trip (56-62 mph in highway) in moderately good weather the range is at least in the 140-145 miles range (225-230km).

I am very impressed. This is almost the double of what I can get with the 60ah. BMW was very cautious about the EPA range with this one.

Elkjaer
Posts: 12
Joined: Fri Jan 08, 2016 12:25 pm

Re: i3 94ah range at highway speed

Thu Feb 16, 2017 5:02 pm

I've pondered the same swap myself and even got a quote for the swap from 60 Ah to 94 Ah at a local BMW repair shop (in Denmark). The price was 75000 DKK (~11000 USD) so I'm waiting until my current 60 Ah battery pack degrades or the price decreases.

I went ahead and did some estimates based on my current consumption in the 60 Ah BEV model with the current assumptions:
Useable energy in 60 Ah version: 18.8 kWh.
Useable energy in 94 Ah version: 27.2 kWh.

My consumption in winter-driving (0 *C / 32 *F) at highway speeds of 110 km/h (70 mph) is 19-20 kWh/100 km, and a realistic average in summertime is 16 kWh/100 km with the same highway speeds.

With a little bit of calculations my 60 Ah estimate for winter-driving on highways gives me 94 km (59 miles). Summertime estimate ends at 118 km (73 miles).
Both estimates match well with the actual range during 2 seasons of ownership in a 2013 model with 23000 km (14300 miles) on the odo.

The 94 Ah version estimates are 136 km (85 miles) for winter and 170 km (105 miles) for summer.

In my mind getting 113 miles of range in the 94 Ah BEV would be a stretch for winters if you plan on going at highway speeds.
Also be aware that the range will decrease as the car ages (how much, I don't know) so it might be possible the first few years only.

helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

Re: i3 94ah range at highway speed

Thu Feb 16, 2017 5:23 pm

In theory it should be that!

But in the real world the 94ah consistently surpasses those theoretical estimates. It seems BMW claims only 27-28KW available but in reality it may be 30KW (http://bmwi3.blogspot.pt/2016/09/the-20 ... 3-rex.html) whereas the BMW dealer said the new pack had some improvements in battery energy flow/management. In that review the guy tried to get less than 100 miles driving like a maniac and he found it was nearly impossible :lol:

I was skeptic but today I would achieve more than your summer estimate (I had only used 40% of the battery with 58 miles on the highway mainly) :) At beginning, I have put a 115 mile trip in the nav system and it was achievable with Ecopro+ (it had an estimate of 125 miles) and we all know the i3 nav system range estimator is very pessimistic. Indeed, at half of that distance I had 40% of battery use and a much larger margin, I even could resume it in Eco Pro mode. Amazing :shock:

Elkjaer
Posts: 12
Joined: Fri Jan 08, 2016 12:25 pm

Re: i3 94ah range at highway speed

Fri Feb 17, 2017 12:20 am

Thanks for your real world feedback.
I know my numbers are very pessimistic and should be taken as a worst case (continuous 110 km/h / 70 mph at freezing temperatures).

It would be interesting if 94 Ah owners could access more than the stated 27 kWh.

Personally on my 60 Ah BEV the available capacity from the "secret" menu has ranged from 17.9 kWh to 19.6 kWh with no clear correlation between temperature or state-of-charge.

helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

Re: i3 94ah range at highway speed

Sat Feb 18, 2017 3:17 am

I have to see my 60ah "secret menu" as well :)

Any other experiences on how far can you take the i3 94ah on a round trip mostly in highway ?

Gif
Posts: 237
Joined: Mon Jun 06, 2016 12:24 pm
Location: Bottom right hand corner of Wales

Re: i3 94ah range at highway speed

Sat Feb 18, 2017 4:33 am

Rex driver! I drive comfort all the time with cabin heat at 20c.

On a quick scan through, I didn't see a mention of geography. Hills make a difference so if you live in an area like I do where everywhere is pretty much up and down hills (even the motorways have many long steady climbs and falls) then you need to factor in that variable too.

I have managed 118 miles before the Rex started in good weather at 16c driving around 56mph on mixed mainly flat roads. I ventured into the hills two weeks ago with temperatures around 5c and I was looking for a charger after about 95 miles.

As has been said, preconditioning makes a difference especially when it's cold so if you have to stop for any length of time without the benefit of a charger then that's a problem to add in too. The restart will be from cold losing you valuable range.

I had a similar conundrum when I bought. Both Bev and Rex would have done for my usual daily needs but I have a fairly regular 118 mile round trip into the hills. Whilst there is a charger the other end, I could not guarantee it. In the heat of summer the Bev may have got me there and back, in winter it was a no go so ended up going for the Rex.

I also think the Rex is a no brainer for the ability to do longer journeys just to add the flexibility of not having to stop and charge so often if it isn't convenient. So for instance, I have to go to London next week which is a 140 mile trip one way. I would have no option but to stop on route in a Bev adding 30 minutes to my journey. Although I probably won't take it, I have the option of not stopping in the Rex.

When I mention this to fossil drivers, they throw back at me the question, "well what if you had to do over 200 miles?" I just point out that you shouldn't really be driving for that long without a break anyway so stopping to charge ceases to be an issue, it's just a further necessity like food, caffeine and a toilet which you have to do some planning for anyway.

The decision to go for the Rex has meant my backup SUV has done 300 miles in 5 months of i3 ownership and most of that was down to snow and load carrying. The i3 has done 6,300 miles in the same period with 6,000 of those being electric. Of the 300 Rex miles, more than half was me deliberately emptying the tank (first time to test the system and second to refresh the fuel). Overall I reckon the true balance of EV/Fossil driving has therefore been 93% -7%. With the Bev, that equation would probably have been nearer 84% - 16%.

Was it worth the extra few thousand for the Rex, you decide? The additional fuel cost per year would probably only be around £200 but I bought an EV to minimise my fossil mileage anyway and somewhat perversely, the comfort blanket the Rex offers allows me to minimise that fossil usage.

helderaguiar
Posts: 8
Joined: Wed Feb 15, 2017 5:04 pm

Re: i3 94ah range at highway speed

Sat Feb 18, 2017 5:37 am

Thanks for your feedback!

Indeed altitude has large impact. What I usually do is reducing speed significantly in uphills and compensating downhills. Let's say I intend to travel 60mph average, in steep uphills I can reduce to as far as 50mph and compensate to even 75mph just before downhill to get energy regeneration to the next level :)

Even in Comfort mode with AC always on you could get 125 miles (including the 7-8 miles left when the Rex kicks in), impressive!

You are right with the Rex comfort. It's a great possibility to have. I was very tempted. But, in top of the higher price, and the probable very rare use, I would loose the Portuguese incentive (which is limited to 100% electric cars) so... I triggered the BEV one.

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