Currently getting 3 quotes for solar power installation for WNW facing roof near Gosford NSW to generate average 9kWh per day...plenty of roof space, some shading from neighbour's gum tree midday in mid winter across approx half the roof, otherwise hot roof exposure. Have got conflicting recommendations re above hybrid (1 for / 2 against)versus mono crystalline systems and getting more confused the more I research. If I can rightly assume that the figures given by the solar companies are accurate, does it really become just a matter of economics. I noted comment on this forum Re: Efficient solar array panels on the market by c*p » Wed Sep 15, 2010 11:19 am ... "...Your important measure is price per kW. How much will it cost to buy 2kW worth of panels, and appropriate framing and mounts? For example if someone is "dumping" perfectly good lower efficiency 150W panels because everyone else is buying high efficiency 200W panels (of similar size), then you might pick up a bargain. It might be cheaper to buy and mount (say) 13-14 of the 150W panels than 10 of the 200W ones. Lower efficiency also means you cover more roof area, which leads to greater shade and possibly less thermal load on your house in the sunny hot periods. Now there's a benefit of LOWER efficiency; if you have the roofspace available." This sounds exactly what the salesman promoting above hybrid panel said..how much credence should I be giving this view. lyndall
I tend to agree with your hybrid salesmans advice, it really comes down to three points. 1) Price per watt 2) roof space and shading 3) the quality, and experience of the company you're dealing with. Anyone with shade issues and or orientation (east/west) problems has to look closer at their options. There are companies that supply 2 or 3 different types of panels and you should get more balanced advice from sale people in these firms rather than those companies that just supply mono panels. Check out solar shop or energy matters they both carry a range and have a lot of experienced staff to help. Personally if you have the shade issue but plenty of roof space, the thin film will probably suit you best but you need a balanced professional on site to asses.
Although the PV panels will insulate the roof to some extent, there is little research quantifying the numbers on this that we are aware of. In the end, if the numbers were the same then some of these less tangible benefits may sway you one way or other. However painting your roof white regardless of the choice of panel would be of more immediate benefit.