Installed solar panel for my house.

For warranty:
Panel - 20 years
Inverter - 5 + 2 years
Workmanship - 3 years

Cost me around RM 24K for the whole package. Using Maybank 0 interest 24 month installment.
So far so good. Can even monitor power panel from apps.

Estimated around 3-4 years based on current bill.
My TNB bill was around RM 300++ before. Last month, it was less than RM 10.