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<blockquote data-quote="Crisbe" data-source="post: 635630" data-attributes="member: 327196"><p>I looked at four systems from different suppliers. All were around the same price except for one type which had solar panels which fit in place of the roof tiles and look the same as a normal tiled roof. The average cost of an installation giving coverage of approximately 6mtrs x 4mtrs was about £13,000 UK pounds. This included the inverter system and wiring. (Also the cost of having an export meter installed by the electricty supply authority)</p><p></p><p>As we use between £700 to £800 of electricity each year you can see where I got the 15 year pay back time from. If I had opted for the best system, that looked just like a normal tiled roof it would have cost approximately £3000 more than the average "plant it on top of" system, so payback would have been even longer.</p><p></p><p>Having said all this, with a large flat roof area in a very sunny climate such as Isreal, I would have thought that the cosst of installation per Kw would be a lot less, because you would only be looking at one lot of wiring and it would be a lot easier to install, plus of course you would get a far greater output from the panels because of the stronger light levels and longer daylight hours at your location. I know we have several schools now in the UK that have solar panels on their flat roofs to cut down on their electricity bills, so the economies of scale must make it worthwhile. It should be the same on a large apartment block in a sunny place.</p></blockquote><p></p>
[QUOTE="Crisbe, post: 635630, member: 327196"] I looked at four systems from different suppliers. All were around the same price except for one type which had solar panels which fit in place of the roof tiles and look the same as a normal tiled roof. The average cost of an installation giving coverage of approximately 6mtrs x 4mtrs was about £13,000 UK pounds. This included the inverter system and wiring. (Also the cost of having an export meter installed by the electricty supply authority) As we use between £700 to £800 of electricity each year you can see where I got the 15 year pay back time from. If I had opted for the best system, that looked just like a normal tiled roof it would have cost approximately £3000 more than the average "plant it on top of" system, so payback would have been even longer. Having said all this, with a large flat roof area in a very sunny climate such as Isreal, I would have thought that the cosst of installation per Kw would be a lot less, because you would only be looking at one lot of wiring and it would be a lot easier to install, plus of course you would get a far greater output from the panels because of the stronger light levels and longer daylight hours at your location. I know we have several schools now in the UK that have solar panels on their flat roofs to cut down on their electricity bills, so the economies of scale must make it worthwhile. It should be the same on a large apartment block in a sunny place. [/QUOTE]
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