|
|
Post by empowerrepower on Feb 4, 2015 22:38:51 GMT 11
In working out how much it would cost to run a Leaf on KwH, I've worked on the basis of each KwH achieving 5 km of travel, or 0.2 KwH per km. I've tried to be conservative with my figures. Overall, is this a realistic calculation for average travel? This would make the average Australian car km, 15 000 km (pretty much how far I travel) cost 3000 kWh of electricity. At 22c per kWh (T33 Qld) that would be $660 per year. Or $810 (5c extra per kWh) if purchasing certified GreenPower. I'm no mathematical whiz, so if I've made some error, please let me know.
|
|
|
|
Post by hieronymous on Feb 5, 2015 5:13:05 GMT 11
Charging isn't 100% efficient. 90% is about the accepted average. So 2.4 KWh from the wall gives about 2.2 in the car.
|
|
|
|
Post by jacky on Feb 5, 2015 7:21:18 GMT 11
0.2 kWh per km seems to be too high. For mine, 0.15 kWh/km is the worst average energy consumption I had after 8000km of traveling.
I am in Melbourne, my off peak electricity charge is about 12.3 cents/kWh (my electric retailer buys all usages from renewable sources). 22 cents/kWh sounds expensive but I know nothing about Queensland.
Can you use T31?
|
|
|
|
Post by hieronymous on Feb 5, 2015 8:49:03 GMT 11
Every driver has their own pattern of distances, road conditions and speeds, and the calculated economy they get will reflect that. In my case (all city driving mostly in 50kph limits) my averages vary from a worst of 0.400 KWh/km or 2.5 km/KWh (3km return to the nearest supermarket), to a best of 0.102 KWh/km or 9.8 km/KWh (41km of flat near-constant cruising). For short distances the Leaf's overheads (displays etc) are a significant cost.
My "lifetime" average is 0.194 KWh/km or 5.4 km/KWh for my conditions. I think 0.2 KWh/km is a sound conservative starting point for a costing.
|
|
|
|
Post by lesmando24 on Feb 5, 2015 9:11:28 GMT 11
My average is 14.3kWh/100km. I wouldn't bother doing measurements much smaller than kWh/100km. You will end up seeing wild fluctuations in values which you will then have to average.
|
|
|
|
Post by hieronymous on Feb 5, 2015 11:07:47 GMT 11
My average is 14.3kWh/100km. I wouldn't bother doing measurements much smaller than kWh/100km. You will end up seeing wild fluctuations in values which you will then have to average. KWh/100km is just a scaled number - I could easily express my averages that way. From your previous posts you drive long, more-or-less identical, daily commutes, and KWh/100km numbers allow you to compare seasonal variations. I wouldn't drive 100km a fortnight, all my trips are local, and never exactly the same. We both, no doubt, charge at the end of a trip so the car is ready for the next. But my charging is minimal for my actual needs, and I need to know my distances and charging requirements for them. A true KWh/100km average ( for actual 100km+ distances) would be meaningless for my Leaf driving. |
|
