This depends on your specific power needs and whether you want back-up power, feeding power back into the grid, or taking your power completely off the grid.
For example, if you wanted to go completely off the grid and your house uses 3 000 watts per day, you may need approximately 700 watts of solar panels to power your house (number of watts used per day/ average sunlight hours per day).
This set-up will ensure that you can run your fridge, TV / DSTV, and lights.
You can also consider starting small and expand your solar power system along the way if your goal is to eventually feed power back into the grid.
