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how much per kilometer

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samjesse View Drop Down
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    Posted: 28 October 2009 at 8:17pm
Hi
How much will an electrical car cost to run per kilometer including the price of the battery change every 5 years assuming the car is driven 20K a year?
i.e.
(cost of battery / (5 x 20,000)) + cost of regular charging = ???

thx
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richo Quote  Post ReplyReply Direct Link To This Post Posted: 28 October 2009 at 10:31pm
20,000km/year
392km/week (51weeks used / year)
65km/day (6 days used / week)

Say average 190Wh/km

65*190=12350Wh/day

Recharge 80% efficiency.
So 15348Wh used (15.4kWh)
recharge on smart power 9.12c/kWh
So $1.40/day to charge
Used 6 days/ week, 51weeks/year for 5 years is 1530 charges.
So $2142 over 5 years.

So if your pack was 15384Wh in size then you would need 4807Ah.
If the cells were $2/Ah then battery pack is $9614 over 5 years.

For a total cost of $11756 over 5 years.
Or $2351 /year or 11.75c/km.

Now if petrol is $1.10/L you would have to get 9.3km/L or 10.7L/100km.

A number of points to remember:
1. This is an example
2. You can get batteries cheaper than $2/Ah.
3. you would keep the battery longer than 5 years.
4. Petrol is not getting cheaper.
If the sun's not up turn your lights ON - duh! Help prevent road rage - get outta my way!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richo Quote  Post ReplyReply Direct Link To This Post Posted: 28 October 2009 at 10:33pm
Sorry excuse my manners

Welcome Samjesse

Don't forget in the 5 years what engine maintenance you would also save on by having an electric motor instead.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote antiscab Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 1:08am
yup,
with the strong aussie dollar, Lithium Battery prices are more like AUS$1.45/Ah

Matt
Matt
2008 Mazda 2 - EV Shop convert
2011 Blade Electron mk6
2007 vectrix - 117'000km
1993 Electrolux - needs batt and charger
1998 Prius - needs batt
1999 Prius - needs batt
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samjesse Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 2:36am
Thank you. I have a lot to learn here.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Thalass Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 7:51am
For comparison purposes: My Outback costs me 12c/km on petrol at the moment - but last year the average was 15c/km - 17c was the highest!

This is why I think it isn't unreasonable to expect to at least break even on running costs on your EV.

Also, in five years, batteries should have come down in price (I hope!) and should have improved energy density.

Edited by Thalass - 29 October 2009 at 7:53am
I'll drive an electric vehicle one day.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richo Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 1:02pm
Now if you serviced your car every year for $400.
Over 5 years it would be $2000.
A complete rebuild of an electric motor would be under $1000.
and I doubt that it would be needed every 5 years!
more like 10 year rebuild.
So you have saved $3000 in engine servicing over 10 years or $300/year.

So the total would drop from $11756 to $10256 over 5 years total cost.
Or $2051/year or 10.2c/km.

Now if batteries were $1.50/Ah and you changed them every 8 years.
$7210 over 8 years for batteries or $902/year.
With the $300 saving in engine maintenance that's $602/year.
+ $428 for charging per year as before that's $1030/year

or 5.2c/km

On petrol at $1.10/L that's 21km/L or 4.7L/100km.
Which is similar to a Prius without stinking up the air!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Squiggles Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 1:46pm
I doubt you would need a motor rebuild ever, maybe bearing replacement every 10 years or so, what is that worth $250. Even a DC motor would need brush replacements and commutator service probably no more often then 5 year intervals.

Now with the Prius you still have the servicing of the ICE then add battery replacement and the servicing of two electric motors......why would you buy one?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob M Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 8:10pm
Don't forget if you are depreciating your batteries over 8 or so years then you should include depreciation of your ICE. New, old and reconditioned have different values on resale etc. A set of lithiums that have driven 200,000 km or so might not be worth much but then what is the value of your ICE car with 200,000km or more on the clock. Kilometres travelled is the first thing a used car buyer will look at.
Depreciation is an important and real cost.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richo Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2009 at 9:48pm
True - dead batteries on resell will be a hard sell.
I always though from the point of view how much needs to be set aside each year to buy the next battery pack.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Thalass Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2009 at 7:46am
Dead lithiums still have some capacity. I'd strongly think about finding another use for them. Mega UPS or something. :P
I'll drive an electric vehicle one day.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote woody Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2009 at 7:50am
Originally posted by Thalass Thalass wrote:

Dead lithiums still have some capacity. I'd strongly think about finding another use for them. Mega UPS or something. :P

Storing off-peak electricity and selling it back to the grid :-)
Planned EV: '63 Cortina using AC and LiFePO4 Battery Pack
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Thalass Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2009 at 7:56am
Or storing wind power or solar or something. For even more 'green cred'. Take that, prius owners! hahahaha
I'll drive an electric vehicle one day.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richo Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2009 at 10:27am
Yeah they are only considered dead in an eV when you can't get where you need to go and use to get.
Some manufacturers state the number of cycles to reach 80% of original capcity.
But even at 80% that may still do the road trips you need in an eV.

So by the time you retire the pack there still may be 60-80% of original capacity.
So would suit peak shaving etc..
or some kids super trike
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