Reddy wrote:Ok, this thread made me question whether I was right about sticking with L1 only. So here are my numbers:
Assume 10,000 mi/yr (even though I only did 7000 last year).
Driving Style: 4 mi/KWH (I get 5 in the Spring to Fall, but 3.5 in the winter).
Electricity: $0.06/KWH no TOU because of all those dams.
10,000 mi/yr x KWH/4 mi x 1/0.75 (L1 efficiency) x $0.06/KWH = $200/yr
10,000 mi/yr x KWH/4 mi x 1/0.85 (L2 efficiency) x $0.06/KWH = $176/yr
So, L1 will cost me $24/yr more than L2. Even using Phil's $300 upgrade (and ignoring the fact that I don't have 240 VAC in the garage), it would take 12.5 yr to breakeven. Using the more realistic 7500 mi/yr reduces the difference to $18 and 17 yr to breakeven. One day I may get 240 V into the garage (it's over 100 ft to the panel in the basement and through two concrete walls), but doing it will make Phil's upgrade look like peanuts. I think I'll wait until there's a real need (like maybe I become a traveling salesman or taxi driver).
The argument is usually not the cost, but the utility. If you don't have a loss of utility, then you are fine, but if there are situations where you simply lose range because you cannot get recharged in time, then it may be worth the hassle.
It does sound like adding 240v to your charging area would be difficult, but maybe not. What service is in your garage now? What wire feeds it, and how many conductors? If there are 2 circuits (would require 2 hots, a neutral and a ground), then you might be able to do it w/o running any new wire. If there is only one circuit, then you will not be able to do it unless you convert your existing circuit to 240v, thus leaving you with no standard 120v service in the garage.
If all you need in the garage is some minor lighting loads, etc, then maybe you could consider changing the existing circuit to 240v, then either installing 240v lighting, or adding a transformer. In extreme cases, sometimes this makes a lot of sense!