Srivenkat
Posts: 34
Joined: Sat Apr 21, 2018 11:27 am

BEV vs REX

Tue Apr 16, 2019 3:25 pm

Hi All,

I am seriously looking at the i3 now that we need an additional car. The BEV would fit our needs for a city car, but aside from the range anxiety, the REX seems to offer the advantage of being able to use the car in town at slower speeds, should the battery life fall, say to a 10 mile range, well out of warranty in 10 years or so. I am wondering if the additional maintenance costs for the REX would be offset by this latter advantage (of being able to use the car with extremely limited battery range). I am wondering what are the annual maintenance costs, in USD for the ReX that folks are seeing?

Also, could we expect BMW or a third party to offer a replacement battery for a reasonable price?

Thanks in advance.

alohart
Posts: 1615
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: BEV vs REX

Tue Apr 16, 2019 8:22 pm

I would be more concerned about expensive repairs of the REx system than I would about extreme battery pack degradation. Why bother with the weight, maintenance, etc., of a REx if you really don't need it?

I expect 3rd-party battery pack modules to be available after the first battery pack warranties begin to expire in significant numbers in 2024, but only if their costs are low enough compared with the used value of 10+ year old i3's to make economic sense. This has been true for early hybrids, but their battery packs are much smaller and thus less expensive.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

Srivenkat
Posts: 34
Joined: Sat Apr 21, 2018 11:27 am

Re: BEV vs REX

Thu Apr 18, 2019 11:13 am

Thanks for the suggestion. I am also wondering what the typical maintenance costs are for the BEV (apart from Tires). How frequently the brake fluid needs to be replaced. Any other maintenance items?

In regard to tires, I see the BEV has different sized tires for the front and back. Did earlier BEVs have the same size tires for the front as for the back but it has changed for latter BEVs? For the 2017 BEV, can the tires be rotated side to side or are they directional?

Thanks in advance.

Srivenkat
Posts: 34
Joined: Sat Apr 21, 2018 11:27 am

Re: BEV vs REX

Thu Apr 18, 2019 11:27 am

Also, for Snow tires, tirerack lists only one size (155/70R19 84Q) while for all-seasons, the rear tire size is different (175/60R19 86Q). Does one use the same tire on both fron/back for the snow tires?

alohart
Posts: 1615
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: BEV vs REX

Thu Apr 18, 2019 1:50 pm

Srivenkat wrote:
Thu Apr 18, 2019 11:13 am
I am also wondering what the typical maintenance costs are for the BEV (apart from Tires). How frequently the brake fluid needs to be replaced. Any other maintenance items?
BMW recommends replacing brake fluid every 2 years. Compared with other cars, this seems overly frequent. Now that our free maintenance plan has expired on our 2014 BEV, I will investigate brake fluid testing to determine whether the water content is high enough to justify replacement.

The cabin air filter needs to be replaced periodically. On our first 2-year scheduled maintenance appointment, our BMW dealer replaced the cabin air filter. However, on our second 2-year scheduled maintenance appointment, our dealer told us that they no longer replace the cabin air filter every 2 years. I will investigate examining our cabin filter every couple of years to determine whether it needs replacing.

Because all of our scheduled maintenance was covered in our free maintenance plan, I don't know what maintenance would cost. It would be minimal compared with a typical ICE vehicle. However, I would either do the simple maintenance tasks myself or consider an independent BMW mechanic rather than paying top dollar to a dealer.
Srivenkat wrote:
Thu Apr 18, 2019 11:13 am
In regard to tires, I see the BEV has different sized tires for the front and back. Did earlier BEVs have the same size tires for the front as for the back but it has changed for latter BEVs? For the 2017 BEV, can the tires be rotated side to side or are they directional?
Only BEV's with pizza slice wheels, type 427 wheels included with early Mega World trim, had the same size wheels and tires front and rear. All BEV's with the 3 other wheel styles had wider rear tires and wheels. I don't know whether later BEV's with 427 wheels have the same size wheels and tires front and rear.

No i3 tires are directional, so they can be rotated side to side. However, the tires do have a marked outside surface, so they could be mounted on a wheel incorrectly.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

gt1
Posts: 312
Joined: Sat Nov 07, 2015 7:31 pm
Location: Baltimore

Re: BEV vs REX

Thu Apr 18, 2019 5:51 pm

I went from REX to BEV, and one thing I realized only after the purchase was that the battery and related parts warranty for the BEV in CARB states is shorter. CARB requires 10y 150k miles warranty for PHEVs, but not for BEVs. I still think that the BEV is a better choice. i3 is a city car, not well suited for travel. It is a perfect second car and a lousy first one. It doesn't need a 200 mile range. The longer warranty doesn't justify hauling around the expensive, heavy and not very reliable REX.

jadnashuanh
Posts: 4430
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: BEV vs REX

Thu Apr 18, 2019 7:18 pm

BMW warrants the battery to hold at least 70% after 8-years (no mileage limitation). I don't think age will be a major problem unless your needs are near maximum when new. What does affect all BEVs, or any car with batteries, is the range loss while it is cold out. Throw that on top of battery degradation, and it might become an issue. My needs are only for 20-miles or so on any given day, and my original BEV is more than up to the task, regardless of the outside temperature.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

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MKH
Gold Member
Posts: 204
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: BEV vs REX

Fri Apr 19, 2019 4:17 am

It is a perfect second car and a lousy first one.
For us it is our perfect only car. :D
We seldom have a need to 'road-trip', and in those rare instances, we would just rent an ICE - whole lot cheaper than even the insurance cost on a 2nd car.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 20 inch wheels, EVoInnovate EVSE

AndrewDebbie
Posts: 153
Joined: Sun Aug 04, 2013 10:37 am
Location: Anglesey, Wales, UK

Re: BEV vs REX

Sat Apr 20, 2019 5:19 am

Srivenkat wrote:
Thu Apr 18, 2019 11:13 am
How frequently the brake fluid needs to be replaced.
Brake fluid flush should be every two years. If you plan to keep the car a long time, this is very good idea. I've had a few older BMWs. Bad things happen if you don't keep up with the brake fluid changes.
2014 LEAF 24 (gone)
2017 LEAF 30 (gone)
2018 Mazda 2 (Debbie's)
2018 i3s 94Ah Rex

AndrewDebbie
Posts: 153
Joined: Sun Aug 04, 2013 10:37 am
Location: Anglesey, Wales, UK

Re: BEV vs REX

Sat Apr 20, 2019 5:24 am

Srivenkat wrote:
Thu Apr 18, 2019 11:27 am
Also, for Snow tires, tirerack lists only one size (155/70R19 84Q) while for all-seasons, the rear tire size is different (175/60R19 86Q). Does one use the same tire on both fron/back for the snow tires?

Yes. BMW sell sets of rims with with winter tires.
2014 LEAF 24 (gone)
2017 LEAF 30 (gone)
2018 Mazda 2 (Debbie's)
2018 i3s 94Ah Rex

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