Money (depending on location). I had solar installed last year in Australia. The 6.5kw grid tied system has an estimated payback time of approx six years, even

Money (depending on location). I had solar installed last year in Australia. The 6.5kw grid tied system has an estimated payback time of approx six years, even with Australia's appalling buy:sales ratio for electricity (3:1 last I looked). For various reasons, I was not eligible for subsidies, and it was still worth it. I pay around AUD$350 per year for electricity, which is mostly in winter. In summer, pulling an average of 30 kwh per day off the panel and running that straight into the AC without needing to worry about the electricity bill is amazing. It's worth noting that due the original subsidies to get the industry going, Australia has some of the cheapest residential solar installation prices in the world. A 6.6kw system (pre means tested subsidies) is around $8,000. That's the panels, the inverter, all the other bits and pieces and the installation. Electricity prices range from $0.20 kwh to $0.40 / kwh.