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How to calculate the generation in kWh of the PV Panels
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<blockquote data-quote="+Sid" data-source="post: 536715" data-attributes="member: 35854"><p>Thanks Bob & binky,</p><p> </p><p>To know that the calculators are usually based on old specs is helpful</p><p></p><p>The problem for me is that in order to generate enough electricity daily to cover the worst of the winter I would probably have to cover both of my SE facing roofs with panels. I can get 16 x 395 = 6.32kWp on my main roof and probably another 6-8 on the smaller one. Whilst I would want a battery I can't see it helping much here if there isn't enough light to charge it during the short winter days.</p><p></p><p> I have since found what seems like a good and sensible local installer who has done a payback calculation for me based on 6.32kWp and come up with a figure of 5 years. Trouble is he has assumed that I will be utilising all of the energy produced all year around. Well, there is absolutely no way that I will be doing that and when I use the PVGIS calculator the proper way and look at the monthly figures and, knowing my usage each month of the year (I have kept records), I can see that I will exporting a great deal of it and my spreadsheet calculations lead to a payback time of 16.5 years.</p><p></p><p>It's interesting that you have produced a lot more than expected but everyone seems to quote annual figures rather than figures for the worst months which is really what matters to me.</p><p></p><p>I don't want to give up on this. The local installer has told me of an installation nearby so I will try to find out first hand what they are producing daily at the moment. Meanwhile I'll keep burning the log fire.</p></blockquote><p></p>
[QUOTE="+Sid, post: 536715, member: 35854"] Thanks Bob & binky, To know that the calculators are usually based on old specs is helpful The problem for me is that in order to generate enough electricity daily to cover the worst of the winter I would probably have to cover both of my SE facing roofs with panels. I can get 16 x 395 = 6.32kWp on my main roof and probably another 6-8 on the smaller one. Whilst I would want a battery I can't see it helping much here if there isn't enough light to charge it during the short winter days. I have since found what seems like a good and sensible local installer who has done a payback calculation for me based on 6.32kWp and come up with a figure of 5 years. Trouble is he has assumed that I will be utilising all of the energy produced all year around. Well, there is absolutely no way that I will be doing that and when I use the PVGIS calculator the proper way and look at the monthly figures and, knowing my usage each month of the year (I have kept records), I can see that I will exporting a great deal of it and my spreadsheet calculations lead to a payback time of 16.5 years. It's interesting that you have produced a lot more than expected but everyone seems to quote annual figures rather than figures for the worst months which is really what matters to me. I don't want to give up on this. The local installer has told me of an installation nearby so I will try to find out first hand what they are producing daily at the moment. Meanwhile I'll keep burning the log fire. [/QUOTE]
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How to calculate the generation in kWh of the PV Panels
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