When investing in solar generation, your calculation of the financial benefits should consider the interest you would have earned by keeping your capital invested over the same period of time.
If you are borrowing capital to fund your solar purchase, you should include the interest costs and fees that you will incur on your loan.
Some current market offerings are based on a lease arrangement where the ownership of the solar hardware installed on your home or business remains with the vendor. Under a lease model it is important to understand your contract terms, conditions and charges, in addition to understanding the value that you expect to gain from your investment. While the upfront cost is removed, you could be in effect paying a higher level of interest through the lease payments – in general this is the most costly option over the long run.
Use the Sorted.org.nz loan calculator to find out your cost of borrowing