matthyde83 Posted January 7, 2022 Share Posted January 7, 2022 Hi all - picking the collective brain… Due to start our build next month and I’m going go through various options. We are based in Surrey and have the attached roof plan (south is the left hand side). I’m trying to work out whether is makes sense to fit PV or not… ASHP, no EV currently. Sahtas handmade brookhurst tiles. 54a1 f.pdf Link to comment Share on other sites More sharing options...
nod Posted January 7, 2022 Share Posted January 7, 2022 From a financial point PV doesn’t make sense Unless like Dave you can pick it up cheap and self install Our predicated saving was £200-300 per year So we ignored planners and didn’t fit On our second Our sap guy is very much pro PV and stated as we will have ASHP we could save as much as £500 annually But conceded with batteries 8-10k install As PV installers are hiking up there prices Due to Covid Of course ? 1 Link to comment Share on other sites More sharing options...
matthyde83 Posted January 7, 2022 Author Share Posted January 7, 2022 I suppose question is saving on tiles vs pv cost plus the saving… Link to comment Share on other sites More sharing options...
JohnMo Posted January 7, 2022 Share Posted January 7, 2022 Saving are better than before, (pay back quicker) with current and expected cost increases. Plenty of companies sell a kit of parts, a local electrician can install, a PV diverter to immersion. 3kW system should allow you to self consume what you produce. Link to comment Share on other sites More sharing options...
TonyT Posted January 7, 2022 Share Posted January 7, 2022 Yes, it makes sense but at the right price. or fit some cabling during the build and do the install later? or DIY or find a spark on day rate to connect up energy prices only go up so anything that can assist will be helpful Link to comment Share on other sites More sharing options...
matthyde83 Posted January 7, 2022 Author Share Posted January 7, 2022 Do you know if there’s any planning requirements?? Would 3kW fit on the southern side of the roof? How many panels would it be? If it’s not a hell of a lot more expensive then I am more than up for a DIY fitting… Link to comment Share on other sites More sharing options...
JohnMo Posted January 7, 2022 Share Posted January 7, 2022 Various sizes are available, ours are 310W each, so 10 panels, ours are in an approx 10m long line. Link to comment Share on other sites More sharing options...
billt Posted January 7, 2022 Share Posted January 7, 2022 If you're not in a special area (conservation area, AONB, national park etc) roof mounted panels are permitted development. If I'm reading that drawing right it doesn't look very suitable for a PV array; hipped roof with lots of gables, so restricted area and lots of potential for shading which can significantly reduce output. Panels produce about 200W/m2 so you'ld need 15 square metres of panels for 3kW. Link to comment Share on other sites More sharing options...
matthyde83 Posted January 7, 2022 Author Share Posted January 7, 2022 3 hours ago, billt said: If you're not in a special area (conservation area, AONB, national park etc) roof mounted panels are permitted development. If I'm reading that drawing right it doesn't look very suitable for a PV array; hipped roof with lots of gables, so restricted area and lots of potential for shading which can significantly reduce output. Panels produce about 200W/m2 so you'ld need 15 square metres of panels for 3kW. Yep I realise it’s not the best. That’s why I’m asking if it a worth considering really… the south facing side is the right of the drawing so one side of the hip. Link to comment Share on other sites More sharing options...
JohnMo Posted January 7, 2022 Share Posted January 7, 2022 You can locate panels East, South and West. Install with optimisers, will keep performance up with shading. Link to comment Share on other sites More sharing options...
Faz Posted January 7, 2022 Share Posted January 7, 2022 If you have to do it for planning then it is what it is. If not, insulate mate. One off cost and there forever. PV's will be toast in a few years as they degrade. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted January 7, 2022 Share Posted January 7, 2022 4 hours ago, matthyde83 said: Yep I realise it’s not the best. That’s why I’m asking if it a worth considering really… the south facing side is the right of the drawing so one side of the hip. You will struggle to get more than 2kW on that gable end and the chimney creates a shading problem. I have a smaller hipped roof and hope to install about 1.2 kW. My motivation for doing this is that it should supply two people with hot water 200 days a year which equates to less wear on a gas boiler or ASHP and a £120 p/a saving. A DIY install would mean a 7 to 10 year payback plus @SteamyTeawill be my BFF which is an incalculable fringe benefit. 1 Link to comment Share on other sites More sharing options...
matthyde83 Posted January 8, 2022 Author Share Posted January 8, 2022 9 hours ago, epsilonGreedy said: You will struggle to get more than 2kW on that gable end and the chimney creates a shading problem. I have a smaller hipped roof and hope to install about 1.2 kW. My motivation for doing this is that it should supply two people with hot water 200 days a year which equates to less wear on a gas boiler or ASHP and a £120 p/a saving. A DIY install would mean a 7 to 10 year payback plus @SteamyTeawill be my BFF which is an incalculable fringe benefit. It’s the other gable, chimney is north so shouldn’t be an issue… I’m trying to work out if it’s much more outlay at the build stage because if not it seems a bit of a no brainer. Link to comment Share on other sites More sharing options...
billt Posted January 8, 2022 Share Posted January 8, 2022 10 hours ago, Faz said: If not, insulate mate. One off cost and there forever. PV's will be toast in a few years as they degrade. Insulating is always a good idea, but PV panels have a very long life if not damaged. Most have a spec of 80% output at 25 years and will still be producing for many years after that. And the 80% is pessimistic. Of course that sort of life expectancy will be for the worst conditions; high temperatures and high insolation, in the UK the stress will be much less and potential lifetime longer. Some of my panels are 8 years old and show no signs of degradation. 29 minutes ago, matthyde83 said: It’s the other gable, chimney is north so shouldn’t be an issue… I’m trying to work out if it’s much more outlay at the build stage because if not it seems a bit of a no brainer. If you source the components yourself from a reasonably priced supplier and don't have to pay the installers surcharge it will almost certainly be worth doing. If you have to pay someone to install it maybe not, but cost effectiveness of these systems is complicated and installation specific. However, that roof still looks problematic. It's got a gable in the middle so you'll have to arrange the panels round that. In combination with the hipped roof it will be difficult to fit many panels and they are likely to look terrible. i'm keen on PV but if I was building that house I wouldn't install panels on the roof. It doesn't look as if you can get much on there, it will likely make the appearance worse and it probably won't reduce your electricity bills much: most of the production will be in summer which isn't when you consume most energy (unless you have a swimming pool heat pump). Link to comment Share on other sites More sharing options...
ProDave Posted January 8, 2022 Share Posted January 8, 2022 My decision was partly on wanting to reduce my energy bills and partly for the few extra SAP points on the as built EPC. Can you do a ground mount sustem or do you have a garage or car port that might be better suited to PV? Link to comment Share on other sites More sharing options...
matthyde83 Posted January 8, 2022 Author Share Posted January 8, 2022 2 hours ago, ProDave said: My decision was partly on wanting to reduce my energy bills and partly for the few extra SAP points on the as built EPC. Can you do a ground mount sustem or do you have a garage or car port that might be better suited to PV? I do have a separate triple garage with a south facing roof yes… problem is I’ve just built that… should have though ahead! Link to comment Share on other sites More sharing options...
matthyde83 Posted January 8, 2022 Author Share Posted January 8, 2022 3 hours ago, billt said: Insulating is always a good idea, but PV panels have a very long life if not damaged. Most have a spec of 80% output at 25 years and will still be producing for many years after that. And the 80% is pessimistic. Of course that sort of life expectancy will be for the worst conditions; high temperatures and high insolation, in the UK the stress will be much less and potential lifetime longer. Some of my panels are 8 years old and show no signs of degradation. If you source the components yourself from a reasonably priced supplier and don't have to pay the installers surcharge it will almost certainly be worth doing. If you have to pay someone to install it maybe not, but cost effectiveness of these systems is complicated and installation specific. However, that roof still looks problematic. It's got a gable in the middle so you'll have to arrange the panels round that. In combination with the hipped roof it will be difficult to fit many panels and they are likely to look terrible. i'm keen on PV but if I was building that house I wouldn't install panels on the roof. It doesn't look as if you can get much on there, it will likely make the appearance worse and it probably won't reduce your electricity bills much: most of the production will be in summer which isn't when you consume most energy (unless you have a swimming pool heat pump). Thank you, I think I’m getting to the same conclusion! Link to comment Share on other sites More sharing options...
Ferdinand Posted January 8, 2022 Share Posted January 8, 2022 On 07/01/2022 at 12:05, nod said: From a financial point PV doesn’t make sense Unless like Dave you can pick it up cheap and self install Our predicated saving was £200-300 per year So we ignored planners and didn’t fit On our second Our sap guy is very much pro PV and stated as we will have ASHP we could save as much as £500 annually But conceded with batteries 8-10k install As PV installers are hiking up there prices Due to Covid Of course ? And savings at current E-prices? Link to comment Share on other sites More sharing options...
nod Posted January 8, 2022 Share Posted January 8, 2022 31 minutes ago, Ferdinand said: And savings at current E-prices? Perhaps another 100 per year I wonder if PV panels have increased in price recently ? Link to comment Share on other sites More sharing options...
saveasteading Posted January 8, 2022 Share Posted January 8, 2022 On 07/01/2022 at 15:05, billt said: conservation area, AONB, national park etc) I seem to recall that even these don't need planning. As to planning and SAP, nobody can make you fit it immediately, and it is reasonable to explain cash flow. The BCO theoretically could say you hadn't yet satisfied the SAP, but unlikely. I have many a project with 'future PV panels' on the planning drawing. Link to comment Share on other sites More sharing options...
Ferdinand Posted January 10, 2022 Share Posted January 10, 2022 On 08/01/2022 at 14:12, Ferdinand said: And savings at current E-prices? On 08/01/2022 at 14:44, nod said: Perhaps another 100 per year I wonder if PV panels have increased in price recently ? So worth perhaps £1000 of extra initial investment ignoring inflation. 1 Link to comment Share on other sites More sharing options...
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