On any solar system if it is an over design on PV and especially batteries the pay back period will become longer.
It would be like starting
You are not allowing for a 10% increase per year in Elec pricing which effectively works to an extra 10% saving per year
You would then be looking
Just when you thought, great my system is optimised and my system is saving me R 791.59, this is not an average, it is the best month of the year, then
Tradie Yesterday, 08:37 AMBill from the utility - import 707 kwh
707 kwh x R2.97 = R2099.79
The saving would be the PV used plus the PV exported
If you get an interest-free or low-interest loan - Taxation
No, it is not taxed
Andromeda Yesterday, 03:38 PM