This is factually inaccurate. Solar PV panels will continue to produce power at 80-90% of rated output after 25 years, and battery storage will still have 80-90% capacity. I'm sure you can understand that as long as the system is storing and producing power at these levels, its value is not zero.

> while the initial principal of your bond investment will remain intact.

As long as the bond issuer remains solvent. How much do you trust bonds that yield 9% to retain their full value for 25 years?