33% is the Return On Investment (ROI) for rooftop solar
Here is the pleasant surprise that I carefully planned for you:
33% is the TRUSTWORTHY Return On Investment (ROI) in solar rooftop installations.
(Please see my posts of August 24th, 31st and September 7th)
You invested $6,959 in return for $2,300 annually for 30 years (1)
The simple mathematical time value of money, is clearly shown in the compounded interest rate tables.
Annual Payment Present value ratio (A/P) in our case is 0.3305.
A/P for 30 years @ 35% interest is 0.3500
A/P for 30 years @ 30% interest is 0.3001
By linear interpolation:
33% is the ROI for this investment (2)
Payback is in 3 years ($6,959/$2,300)
The best predictable investment ever.
Solar panels typical warranted working life
33% Return On Investment (ROI) is confirmed as calculated using HP-10B business calculator