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Old Fri, Jun-14-2019, 03:22:14 PM   #11
FK
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

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Well, I am an engineer


I knew that lol
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Old Fri, Jun-14-2019, 03:35:19 PM   #12
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

Does the baby sleep in there? I've heard that Electric cars are too quiet for babies to sleep. They need vibration from the car to get them to sleep.

i should know, I have a 2 year old.
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Old Fri, Jun-14-2019, 03:39:12 PM   #13
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

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And since everyone asks about the range, I'd describe it as follows:
100% sufficient for everything that isn't taking a road trip. 100% insufficient for a road trip.

We've not yet had to alter our plan or driving style, or use a public charger, with the car. Since it always starts the day full, and very rarely do you drive more than 130 miles locally (and since I charge it at work), it's always sufficient.

But, the range:
On my all highway, at the speed limiter driving cycle it gets ~95 miles of range.
With my wife's around town cycle, it gets ~185 miles of range. Both in full power, full AC mode, with no consideration given to efficiency.

It's actually pretty nice not going to the gas station twice a week
I think you've sold me on this. up to 185 miles range without REX?
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Old Fri, Jun-14-2019, 03:47:28 PM   #14
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

very petite monocoque
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Old Fri, Jun-14-2019, 04:00:32 PM   #15
racingbmwm3
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

and Congrats! Hope to be joining your E club soon.
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Old Fri, Jun-14-2019, 05:12:57 PM   #16
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

What type of impact have you noticed on your electric bill? The idea of an electric car is somewhat cool for my stop and go commute, but not sure if it would make sense if the electric bill is noticeably changed.
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Old Fri, Jun-14-2019, 05:14:21 PM   #17
Obioban
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

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I knew that lol
... oh

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Originally Posted by checkmate1 View Post
Does the baby sleep in there? I've heard that Electric cars are too quiet for babies to sleep. They need vibration from the car to get them to sleep.

i should know, I have a 2 year old.
So far she's slept all of every drive.

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I think you've sold me on this. up to 185 miles range without REX?
That is not as simple of an answer as you might think.

BMW has offered the i3 in 3 battery sizes:
60aH (2014-2016)
94aH (2017-2018)
120aH (2019-2021)

My car is a 2017, so it has the 94aH battery-- 50% more than the earlier cars, but only 3/4 of the current model.

From there, it seems like most people get ~5% battery degradation in the first 10,000 miles, than then it more or less holds steady for a long time-- Samsung (makes the battery) says that battery will fall below 70% of original capacity at 526,000 miles on average-- and which point (below 70% of capacity) the battery is considered failed. Mine is at 25,000 miles, so through the 5% initial degradation.

Temperature is also a factor-- very cold weather requires heat for the battery, heat for the cabin, and heat for the seat heaters-- the combined effect supposedly reduces the range by ~25%. Very hot weather requires AC to cool the cabin and the battery-- supposedly decreases total range by ~15%. Both of those can be partially mitigated by having the car precondition the battery/cabin-- which you can do by programming it to happen at a set time using iDrive, coding the key to allow you to do it remotely, or by using the BMW connective drive app. I currently have the car programmed to precondition itself, but my work commute time is identical every day.

Then there's different driving modes-- comfort, eco, eco pro+, that help to extend the range as desired. We've never used anything but comfort.

And then there's how you use the car-- highway is the least efficient drive cycle for the car, traffic jams are the most efficient. And faster on the highway is significantly worse than slower on the highway. Basically the less your speed is decreased by air or brakes and the more it's decreased by regen, the greater the range.

But, all that said, 180 is doable, off highway, if you gave any consideration to it and it wasn't the middle of winter in a cold area. E.g. here's a screen shot from my wife's last drive, just going to work (driving normally, AC on, full power, not hyper mileing):



6% battery usage got her 10.6 miles, so, extending that drive style out over 100%, 10.6/6*100 = 177 miles of range from 100% of battery for her that day.
(that does not agree with the car's estimated range remaining because that estimate is based on previous behavior-- aka, me driving it on the highway)
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Last edited by Obioban; Fri, Jun-14-2019 at 05:57:31 PM.
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Old Fri, Jun-14-2019, 06:00:41 PM   #18
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

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What type of impact have you noticed on your electric bill? The idea of an electric car is somewhat cool for my stop and go commute, but not sure if it would make sense if the electric bill is noticeably changed.
Effectively no change. At our electric rates, charging the car from 0% to 100% costs $1.42. Most days it’s somewhere between 50% and 85% full when it gets plugged in, so $0.21 to $0.71 per day.

... I’m charging at work for free, so even though I’m commuting 100 miles/day, I’m only paying for half of that.
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Last edited by Obioban; Fri, Jun-14-2019 at 06:05:01 PM.
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Old Fri, Jun-14-2019, 07:00:48 PM   #19
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

I want one, how much did you pay for yours?
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Old Fri, Jun-14-2019, 07:16:48 PM   #20
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Default Re: Whats up M3F bought a CF monocoque to ruin with a baby

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I want one, how much did you pay for yours?
$19100 plus transport ($700)

Picked up the charger 9 months used on eBay for $280 ($600 new) and wired it up myself with ~$80 in circuit breakers and wire (sounds like electricians charge ~$500 to do this). The car comes with a 120v wall socket charger, but that takes something like 16 hours to charge the car.
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Discussing Whats up M3F bought a CF monocoque to ruin with a baby in the Off Topic Forum - Place to discuss this and that. Note: We also have "request to join" forums: Guns and Fitness.
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