epirali said:
Also someone said cost estimates are wrong and can be as high as 40c/kwhr, but look here.
http://www.eia.gov/electricity/monthly/epm_table_grapher.cfm?t=epmt_5_6_a" onclick="window.open(this.href);return false;
I am sure there are places where power may be more but seems like 13c/kwhr as an average is pretty good start.
I'm the one who said that, and yes the
average cost of electricity may indeed be only 16.5¢ as that chart says, but I also said you can't use the average in a state like California where tiered rates are involved.
Specific example for my area, using the standard rate schedule (E-1) that most people use, and looking at May through October:
13.23¢/kWh for the first 11 kWh/day
15.04¢/kWh for the next 3.3 kWh/day
31.11¢/kWh for the next 7.7 kWh/day
35.11¢/kWh for everything after that.
If you have an electric clothes dryer and run an air conditioner during the summer it is hard not to use at least 22 kWh per day. If you are already using an average of 22 kWh or more per day for the house, then all of your EV charging will be on top of that, and will cost you 35.11¢/kWh.
Yes, that's "only" 35¢, not 40¢, but some rate schedules do go higher. Our utility's solar rate goes up to 50.6¢ at the top tier!
One final point: If I had that rate schedule and was using exactly 22 kWh/day, my cost would be
0.1323*11 + 0.1504*3.3 + 0.3111*7.7 = $4.35/day
$4.35/22 = 19.76¢/kWh
That is not much above what the chart you pointed to shows, and it is
far below what charging the car would actually cost. That's why I said you can't use average cost if the rate schedule is tiered.
Ray