Hi Mark
I was just trying to give an example of how cost and benefits could be presented for people in a specific situation with a set of assumptions clearly defined. The word ‘net’ was intended to imply that the difference between the gross savings and additional mortgage payment would be invested.
Regarding payments to superannuation additional contributions can be made by most people up to $25,000 — use a Notice of Intent form to inform your fund that you wish it to be treated as a concessional contribution, which will reduce your taxable income, but be taxed at 15% within the fund.
It sounds as if in your situation a battery would not provide significant benefits — for a rough estimate of what you might save take a look at how much electricity you buy from the grid and calculate the difference if it cost off-peak rate.
