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Flat Roof Solar PV Array Spacing / Shade Calculator

The minimum required space between parallel rows to avoid shading is decided by the height of the array immediately in front, the slope of the roof and the lattitude of the installation site. The table below is only for illustration, different row spacings will be required for different panel sizes, mounting systems, array pitches, roof pitches and locations.

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FlatFix Array Rear Sketch

Flat Roof: Parallel Row Spacing

Spacing illustrations are based upon mounting solar panels measuring 1675x1001x31, using two frames secured directly to a completely flat roof (0°) in two parallel rows both facing due south.

We have assumed that no shading on the panels is acceptable i.e no self shading even at the winter solstice, this would be a particularly important consideration for off-grid systems or any other systems using batteries. With some systems however, particularly commercial systems, depending on the electrical load requirements on-site; sacrificing optimum power generation during mid winter might be worthwhile, if in return, extra rows of panels could be installed that would significantly increase power yields overall over the year.

Location Lattitute Orientation Array Pitch Min Spacing
Channel Islands 49.1° Landscape 20° 1.252m
Channel Islands 49.1° Landscape 25° 1.529m
Channel Islands 49.1° Landscape 30° 1.785m
Channel Islands 49.1° Portrait 20° 2.142m
Channel Islands 49.1° Portrait 25° 2.517m
Channel Islands 49.1° Portrait 30° 2.863
Location Lattitute Orientation Array Pitch Min Spacing
Plymouth 50.3° Landscape 20° 1.359m
Plymouth 50.3° Landscape 25° 1.661m
Plymouth 50.3° Landscape 30° 1.94m
Plymouth 50.3° Portrait 20° 2.286m
Plymouth 50.3° Portrait 25° 2.695m
Plymouth 50.3° Portrait 30° 3.073m
Location Lattitute Orientation Array Pitch Min Spacing
London 51.5° Landscape 20° 1.481m
London 51.5° Landscape 25° 1.812m
London 51.5° Landscape 30° 2.12m
London 51.5° Portrait 20° 2.452m
London 51.5° Portrait 25° 2.9m
London 51.5° Portrait 30° 3.32m
Location Lattitute Orientation Array Pitch Min Spacing
Birmingham 52.5° Landscape 20° 1.599m
Birmingham 52.5° Landscape 25° 1.958m
Birmingham 52.5° Landscape 30° 2.292m
Birmingham 52.5° Portrait 20° 2.612m
Birmingham 52.5° Portrait 25° 3.097m
Birmingham 52.5° Portrait 30° 3.55m
Location Lattitute Orientation Array Pitch Min Spacing
Leeds 53.8° Landscape 20° 1.78m
Leeds 53.8° Landscape 25° 2.181m
Leeds 53.8° Landscape 30° 2.556m
Leeds 53.8° Portrait 20° 2.856m
Leeds 53.8° Portrait 25° 3.399m
Leeds 53.8° Portrait 30° 3.91m
Location Lattitute Orientation Array Pitch Min Spacing
Carlisle 54.9° Landscape 20° 1.963m
Carlisle 54.9° Landscape 25° 2.408m
Carlisle 54.9° Landscape 30° 2.824m
Carlisle 54.9° Portrait 20° 3.105m
Carlisle 54.9° Portrait 25° 3.707m
Carlisle 54.9° Portrait 30° 4.271m
Location Lattitute Orientation Array Pitch Min Spacing
Edinburgh 55.9° Landscape 20° 2.163m
Edinburgh 55.9° Landscape 25° 2.655m
Edinburgh 55.9° Landscape 30° 3.12m
Edinburgh 55.9° Portrait 20° 3.375m
Edinburgh 55.9° Portrait 25° 4.041m
Edinburgh 55.9° Portrait 30° 4.666m
Location Lattitute Orientation Array Pitch Min Spacing
Aberdeen 57.1° Landscape 20° 2.458m
Aberdeen 57.1° Landscape 25° 3.019m
Aberdeen 57.1° Landscape 30° 3.547m
Aberdeen 57.1° Portrait 20° 3.774m
Aberdeen 57.1° Portrait 25° 4.534m
Aberdeen 57.1° Portrait 30° 5.25m

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Mains/Grid Isolation and Surge Protection

Mains/AC Surge Protection Solar PV Systems

A whole house surge protector is installed to provide protection from transient overvoltages originating from the mains/grid. A whole house surge protector is installed directly inline and as close as possible to the incoming mains/grid supply meter, this allows for surge protection for all circuits and equipment including solar inverters, routers, stereos and other sensitive electrical equipment within the network. The addition of a 100Amp lockable isolator also allows for safe and convenient isolation of all electrical equipment within the network including consumer units, solar inverters, battery storage units and EV chargers from the mains/grid in one place.

Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671.

Mains/Grid Isolation and Surge Protection


Solar PV Surge Protection (DC Surge Protection)

DC Surge Protection Solar PV Systems

DC surge protection devices (SPDs) are installed between the solar panels and the solar inverter to protect both the solar inverter and the downstream electrical equipment from transient overvoltages of an atmospheric origin impacting the electrical system via the DC side of the system / the solar panels.

DC Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671.

Solar PV Surge Protection (DC Surge Protection)

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Articles: Further Information, Calculators & Solar Inverter Fault Codes

Lots of articles, calculators and technical information including links for further reading. Covering a range of topics related to the installation and maintenance of solar photovoltaic and electrical systems in the UK.

/Solar PV Information Articles

Free Solar PV Calculators

A list of free solar PV calculators, solar design tools and software, Use to calculate solar yields and the Return on Investment (ROI) for solar PV systems.

Solar Panels - PV Array Calculator

Solar Panels: Solar PV System sizing and power yield calculator. Use to work out roof layouts, PV array sizes, No. of panels and power yields. Based on SAP 2009.

How to provide power to a house using a portable generator

In this article we show you how to power your home using a portable diesel, petrol or LPG generator. We look at changeover switches, the importance of earthing, generator loadings, how to isolate non essential loads. We ask where to locate the generator when it's in operation, how best to safely isolate the grid/mains power supply and switch to a generator supply.

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Areas Served:

We are located in Wanborough, very close to Swindon in Wiltshire, Southern England, UK. From here we service clients within a 90 minute driving radius including the towns, cities and regions below:

Swindon: Abingdon, Aldbourne, Amesbury, Andover, Banbury, Basingstoke, Bath, Berkshire, Bicester, Blunsdon, Box, Bracknell, Bradford on Avon, Bridgwater, Bristol, Buckingham, Burford, Burnham on Sea, Calne, Camberley, Cardiff, Carterton, Cheltenham, Chippenham, Chipping Norton, Chipping Sodbury, Cirencester, Corsham, Cricklade, Devizes, Didcot, Evesham, Eynsham, Faringdon, Frome, Fleet, Glastonbury, Gloucester, Gloucestershire, Hampshire, Henley-on-Thames, Highclere, Highworth, Hook, Hungerford, Keynsham, Kingsclere, Lambourn, Lechlade, Ledbury, Ludgershall, Lyneham, Maidenhead, Malmesbury, Marlborough, Marshfield, Melksham, Minety, Newbury, Newport, Oxford, Oxfordshire, Pewsey, Purton, Ramsbury, Reading, Ross on Wye, Royal Wootton Bassett, Salisbury, Shaftesbury, Shalbourne, Slough, Southampton, Stow, Stratford upon Avon, Stroud, Swindon, Tewkesbury, Thatcham, Tidworth, Trowbridge, Wanborough, Wantage, Warminster, Weston Super Mare, Wiltshire, Winchester, Windsor, Witney, Wokingham, Worcester, Wroughton and Yate.

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