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Commented On: Will New High-Power Microbatteries Matter For Electric Cars?


Green Car Reports 0 Views 10 comments
Energy density is more important for electric cars than power density. There are already a load of batteries around that can charge fast enough that the limiting factor on the charge length is the charger or electricity supply and not the battery.

Commented On: Electric 2014 BMW i3 ReX Coming Dec, Lower Engine Power Confirmed


Green Car Reports 0 Views 14 comments
The interesting thing will be whether the driver can choose when the range extender comes on.

>"not have "full power when it runs on the combination" of battery and engine."

If the driver is clever and knows how far they are going and turns the range extender on ahead of time then the car should have full performance for the whole journey in a lot of circumstances (not all).


[Obviously they have to stop the owner from turning it on when the thing is fully charged to avoid the whole smoke and flames thing. ;-) ]

Commented On: Tesla Model S Electric-Car Deliveries For Q1: 4,750-Plus, Says Company


Green Car Reports 0 Views 20 comments
The other issue is that the battery now lasts longer so does this change the warranty in any way?

Commented On: Tesla Model S Electric-Car Deliveries For Q1: 4,750-Plus, Says Company


Green Car Reports 0 Views 20 comments
I was wondering this too. The weight limits the range and so do they use more than 40Kwh of the battery to compensate?

Which part of the state of charge window is used? If they use the lower part then the cars will always charge quicker than the others when using the superchargers. If they use the upper(ish) part the pack will last longer and have a higher voltage (more power), but charge slower.

I assume then that they will be using the middle of the pack? ...Or not?

Does it mean there is now no "range mode" charging?

What happens when you run out of your 40kwhrs. The car goes into limp mode? For how long? Is it a software limited limp mode, but with 20kwhrs left in the pack?

John? :-) (Good fodder for the next article)

Commented On: NRA Comes Out For Electric Cars To Charge Energy-Pulse Rifles


Green Car Reports 0 Views 10 comments
This is wonderful! I have sent my membership fee to the NRA based on this wonderful news.

....Wow April the 1st sucks. :-)

Commented On: BMW i3 Electric Car: ReX Range Extender Not For Daily Use?


Green Car Reports 0 Views 57 comments
The motor is 130KW in the BMW i3 and the 0-60 mph time is supposed to be less than 8 seconds. Using 130KW of power for 8 secs consumes roughly 0.3 KWhrs. You can very quickly get 0.3KWhrs back with a 20-30KWh ish range extender.

Hills area bit of a problem if they last a long time, but I guess you just go slower.

Commented On: BMW i3 Electric Car: ReX Range Extender Not For Daily Use?


Green Car Reports 0 Views 57 comments
Seems like a range extender really doesn't have to produce that much power if you have a light and aerodynamic car.

I was going to produce the results, but they are so low I'm doubting them now.

18KW @ 70mph. Does that seem right?

Commented On: BMW i3 Electric Car: ReX Range Extender Not For Daily Use?


Green Car Reports 0 Views 57 comments
The Ecomodder website has a good vehicle energy calculator. Most people here will know about it, but if you don't then if you search for this in Google you'll find it:

"Aerodynamic & rolling resistance, power & MPG calculator"

I just used it to see how much energy you need for a range extender for the BMW i3. It's highly possible I have both got the specs for the car somewhat wrong (since they are not all known) and that I have used the calculator incorrectly. That's just a disclaimer. :-)

Specs I used:

Car weight = 2800lb (1271kg)
Coefficient of drag= 0.26 (mostly a guess in the dark)
Frontal cross sectional area = 2m(width) X 1.5m(height) = 3 m^2
Engine efficiency = 85% (rough guess)


Continued in part 2...

Commented On: Nissan Leaf Owners Get Hot Laps In Electric Nismo RC Racer


Green Car Reports 0 Views 1 comment
I really think they should have Nismo-ised the Leaf. One of it's great failings is that it looks terrible. I was hoping they were going to change some of the body panels for the new 2013 version.

I'm someone who wants to see it succeed.

Commented On: Want To Trade Your Tesla Roadster In For A 2012 Model S? Now You Can


Green Car Reports 0 Views 3 comments
So if you start the process of trading the car in then presumably Tesla will give you an offer for your car before you complete the process. I'm assuming that in many ways this offer will be equivalent to a Tesla battery degradation report.

If the owners all went through the trade in process and then compared the offers from Tesla then they would have a good sense of what Tesla thought the state of their battery was.

This is not a serious suggestion. :-)
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