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Cool stuff you with you knew more about related to EV technology

September 2008 Posts

Archives

  EV Nuggets with Dr. Briggs
Blog Entry

EV Gas Tank

Saturday, September 6th 2008 @ 9:52 AM    post viewed 839 times

click to download this audio file

Gas is sold in gallons.  Here are some gas tank sizes

   Smart      = 9 gallons
   Camry     = 18 gallons
   Escalade = 26 gallons

Electricity is sold in KWH (Kilo Watt Hours).  Here are some EV tanks sizes in KWHs

Prius =  1.3 KWH
Aptera Local = 10 KWH
Chevy Volt = 16 KWH
GM EV1 = 27 KWH
Toyota RAV4 EV = 29 KWH
Nissan Altera EV = 32 KWH
Tesla Roadster = 53 KWH
Typical Home = 29 KWH per day

 

EVGasTankGraph.jpg

Note the huge size of the Tesla battery compared to everything else.  Also note the small size of the Aptera battery.  This is possible due to the efficiency of the Aptera vehicle, i.e. it takes very little energy to drive the Aptera down the road.

COST TO FILL THE TANK

Camry
18 gallons x $4/gallon = $72.00

Tesla
53 KWH x $0.20/KWH = $10.60

 

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Comments

Paul Cummings
Free Access		PaulCummings said on Monday, September 8th 2008 @ 12:57 AM:

Very interesing and well-put-together chart John.  Seeing this info visually and succinctly really helps to see the differences on the 'gas tank' sizes.  It is also interesting to note that, like comparing gas tank sizes, the amount of kwh's in an EV is only part of the story- how efficiient the car is can still make a big difference.  I guess there really is a reason businesses like charts so much;-)


John Briggs
Free Access		JohnBriggs said on Monday, September 8th 2008 @ 7:43 AM:

Paul,
   Thanks for the feedback.  Looking at the chart, one thing that struck me is how small the Prius battery is.  People sometimes think that they can just put a bigger battery in a Prius and have an EV.  But once you realize that the Tesla battery is 40X the size of the Prius battery, you realize what a challenge it is to create a reasonable battery for an EV.
    Also interesting is that even with the 53 KWH battery in the Tesla, the range is only 227 miles compared to about 400 miles for most gasoline powered cars.  I think EV makers would like to have a range of 400 miles but battery weight and cost prevent them from achieving this goal.
Later
John C. Briggs


John Briggs
Free Access		JohnBriggs said on Monday, September 8th 2008 @ 9:19 AM:

http://sify.com/finance/fullstory.php?id=14754174

This article claims that the EEStor battery will have 52 KWH and weigh only 300 pounds. This is about the same capacity as the 53 KWH Telsa battery that weighs 990 pounds.  That is only 30% of the weight. 

  If EEStor can commercialize that battery, it will be a "game changer".  But it usually takes many years from prototype battery to commercial battery. So as Bo says, "we shall see".


Dag Johansen
Free Access		DagJohansen said on Thursday, January 29th 2009 @ 12:14 PM:

You can add:

Th!nk City = 28.3 KwH

 

(Either Enerdel Li-Ion or MES DEA Zebra Sodium)


EV, KWH, Battery