Pay back period about 5 year, do you understand what a pay back period is ?
Let me explain, pay back period is the time it takes to pay for it's self. After the pay back period it cost you nothing so all the power it produces is free so if you use 6000 kwh in a year you save $1650 per year.
$1650 saving per year for 15 years after the 5 year payback period you have saved $24,750.
If you choose to stick with coal power electricity with no solar panels it would cost you $33,000
