Our system is paid off 4 ½ years. If you only take into account just power savings no others savings.
We made 90 MWh that is $10,175.22 (our power is about .113 cents)
This is ahead of my time estimate when I was designing the system.
Each microinenver made about $192.
It is very exciting system payoff was end October 2017.
We have many more savings. Add in natural gas savings scene we heat with mini splits.
20 K EV miles a year on our Chevy Volt Solar powered. Gasoline savings...
We could not be happier with this system. I am very glad to see others getting great results also. When I was on some other forums they told me I could not do a DIY install for system size that I installed. They were wrong and very short order I increased my system size from 9.2 KW to 12.5 KW.
This forum is so much better where we encourage other DIY projects. There are many good projects on here that have enough info to decide if you want to try it yourself.