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Solar panels on single story extension flat roof - permitted development?
Comments
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Reed_Richards said:
Well yes, but flat panels hardly seems an ideal layout.gefnew said:Like this maybe.Not ideal, but not as terrible as all that.PVGIS suggests, at roughly my location, panels at optimum slope (40 deg.) will get me 1.03kWh/yr/Wp while horizontal ones will make 0.86kWh/yr/Wp. That's a 16.5% loss vs. optimal.Even vertical-but-south-facing panels make 0.74kWh/yr/Wp, which is more than I expected. Now I'm wondering about wall-hung panels ...N. Hampshire, he/him. Octopus Intelligent Go elec & Tracker gas / Vodafone BB / iD mobile. Ripple Kirk Hill Coop member.Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Best kettle!
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 34 MWh generated, long-term average 2.6 Os.0 -
Thanks all, very helpful0
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EV Puzzle on YouTube had vertical ones put on his east facing wall and they seem to work well.QrizB said:Reed_Richards said:
Well yes, but flat panels hardly seems an ideal layout.gefnew said:Like this maybe.Not ideal, but not as terrible as all that.PVGIS suggests, at roughly my location, panels at optimum slope (40 deg.) will get me 1.03kWh/yr/Wp while horizontal ones will make 0.86kWh/yr/Wp. That's a 16.5% loss vs. optimal.Even vertical-but-south-facing panels make 0.74kWh/yr/Wp, which is more than I expected. Now I'm wondering about wall-hung panels ...4.29kWp Solar system, 45/55 South/West split in cloudy rainy Cumbria.1 -
Flat roof panels will also need cleaning since debris may stick before rain can wash it off. I think leaves can cause generation issues if they stick to enough cells.QrizB said:Reed_Richards said:
Well yes, but flat panels hardly seems an ideal layout.gefnew said:Like this maybe.Not ideal, but not as terrible as all that.PVGIS suggests, at roughly my location, panels at optimum slope (40 deg.) will get me 1.03kWh/yr/Wp while horizontal ones will make 0.86kWh/yr/Wp. That's a 16.5% loss vs. optimal.Even vertical-but-south-facing panels make 0.74kWh/yr/Wp, which is more than I expected. Now I'm wondering about wall-hung panels ...
I've always been a fan of vertical PV panels. they solve the problem for folk who don't have a roof, or suitable roof, and whilst gen is lower, they do have a strong winter bias which helps economically. But ...... unless anything has changed, wall mounted PV does need PP too!
How about BIPV, building integrated PV (very old article):The school with the largest solar facade in the world
Mart. Cardiff. 8.72 kWp PV systems (2.12 SSW 4.6 ESE & 2.0 WNW). 28kWh battery storage. Two A2A units for cleaner heating. Two BEV's for cleaner driving.
For general PV advice please see the PV FAQ thread on the Green & Ethical Board.1
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