How can you possibly claim to know what is true for me? My array, which I bought for cash, is on schedule to pay itself off in under 10 years. I bought my car used, low mileage, and expect to get 60,000 miles or more with low or no maintenance costs. I'm up to about 4000 miles, which would have cost me about $700 in gas alone, not to mention the $75 or so for the necessary oil change.

That pencils out to about $1500 a year in savings, I will probably keep the car for about 5 years, or about $7500 in savings.

The average U.S. electric bill is about $120 a month, or $1400 a year. I am frugal with my use so I can call that as low as $1000 year, subtract my grid hookup fee (average $15 a month or $180 a year) and call it $800.

So, I have saved in the neighborhood of $4800 in household use over six years (wish I had bought my Volt three years ago) and the array will be paid in full in less that ten years, it has an estimated life time of over 20 years.

Even if it took the lifetime of the array to pay itself off it would still be the right thing to do for me. The financial benefit of over ten years of free household current and free transport fuel just makes it sweeter. BTW, solar panels and EVs will get cheaper and more efficient, but on this matter I am happy to be an "early adopter";)