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There are several factors which should be considered when assessing whether a roof will be good for solar PV installation. These factors apply to both commercial and residential PV developments. In summary, there are seven key characteristics necessary for a good solar roof: 1.Good roof orientation Ideally the roof would face directly south, to maximise the exposure to the sun. However, east and west facing roofs still present a good opportunity for solar installations and offer good potential for energy generation. Shallow-pitched north-facing roofs can also be used. 2. Good roof pitch To maximise energy generation, the panel surface should be perpendicular to the sun’s rays. The optimum pitch angle on a south facing roof is around 40° to maximise energy generation and ensure consistency throughout the year. However, shallower or steeper pitches can also be effective, while flat roofs’ generation potential can be improved by using mounting systems which optimise the tilt angle. 3. Structurally sound The roof must be structurally sound to withstand the additional loading from the solar PV system. In addition, the type of roof material will also affect the cost. Commercial roofs with asbestos can add complexities, often requiring replacement due to drilling through the sheets for fixings. Integrated systems are an option for tiled roofs and offer potential savings. 4. Sufficient roof space There needs to be adequate roof space to install the desired array size while leaving the required setbacks from roof edges and ridges. This can be made more complicated if there are large amounts of roof furniture such as chimneys, dormers, or industrial equipment present. 5. Limited shading An ideal site will have no sources of shade over the installed panel area. Any sources of shade will reduce the generation potential. The use of optimisers will reduce the losses of the overall system but individual panel losses will still affect performance. 6. Limited environmental or heritage sensitivities Planning permission may be required for systems near listed buildings or in conservation areas. Larger systems over 50kW will also require approval. 7. Good grid connection You will need permission to export any surplus electricity, and for many sites this is a key constraint. The export capacity needs establishing early in the project because this can have a significant impact on the size of the system and the financial performance. For answers to all of your solar power questions please visit our dedicated Commercial https://buff.ly/44iG7Kc or Residential solar power https://buff.ly/3xYKjD1 pages. If you can’t find what you are looking for then send us your question and we’ll get an answer to you. Do you own a site you think could benefit from a solar PV installation? Let us take a look, we can give you our initial thoughts on whether you would benefit from our solar feasibility service. https://buff.ly/3UAhbe6

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