So you spend $20,000 and get 125% back over 30 years. That would be about $25,000 before taxes. But for the first years all you are getting back is your capital since at the end of the investment that is all gone. Your initial 6% includes return of capital does it not and therefor is not the return on investment.<quoted text>
And this is why I call you an idiot. It's not out of malice, it's just a simple fact.
Expected life of the system is minimum of 30 years and given your very simplistic initial assumptions on a system you specifically picked, results in a IRR of ~6% with a ROI of ~125%.
These results show you to be a liar and a fraud once again.
And the worst part is you have to wait 162 months before you have your capital all back. Given that the average homeowner lives in a house for a much shorter period of time you may not ever get your money back unless you can convince the buyer of your home to pick up the solar panels from you as well.
And you have to rely on the owners of the project and their successors remaining good managers of your investment. What gurantees are you going to require to get that comfort?
Of course $20,000 invested in the stock market would return you around $140,000 after thirty years and you would still have your original $20,000. The average real estate investment would return somewhere around 500% or $100,000 over 30 years. Choose which investment you want.