Well other people have different ideas, and rely on different data. Large-scale solar photovoltaics – competitive round 6kW solar systems: Pricing, output, and returns After an intial roof-top solar array of only 1.5kW (six panels), I made the change up to a 6kW system (twenty-four panels). Mains Power costs in Australia are quite pricey, and my present power bills are only 30-36% of what they used to be. In Summer on a good sunny day I can generate up to 37 kWHs, but its presently Winter in the Southern Hemisphere and today was somewhat cloudy - so just almost 7 kWHs was reading on the meter by sundown. (Note: referring to the photo heading this 6kW story, three homes with rounded pools, roofs cream, grey, and grey again towards the lower-right - all have 24 panel systems.) I own two cordless motor mowers- one 18" cut, and the other one 21" cut. Three 56V batteries 2A/H, 4A/H, and 6A/H will fit in the larger and also in a Brushcutter. Is home solar power still worth it in Australia in 2018? "Conclusion: Is solar PV still worth it in 2018? Absolutely In 2018, solar power systems remain affordable and attractive, especially in light of the plague of high electricity prices. Solar feed-in rates may be not be spectacular, but with system prices as low as they are it’s not difficult to see favourable returns from putting solar on your roof, particularly if you shop around and manage to find a good deal. Furthermore, making efforts to increase your rate of direct solar energy consumption (e.g. with a home management system) will also help to maximise returns."