Solar Panels - PV System Sizing and Power Yield Calculator
A simple PV array size (metres, sq m, kWp) and power output (kWp, kWhrs) calculator. The given measurements are for unobstructed areas of space to be made available for solar photovoltaic (PV) panels. Solar PV panels are mounted on-roof using aluminium rails, roof hooks and clamps.
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Use this calculator to quickly estimate of how many large solar panels you could fit onto a roof and roughly calculate how much power they could generate (kWhrs). The number of panels, the roof layout, the overall system size including mounting equipment and example power output figures (kWhrs) are provided for each system.
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Solar panel details: (based on the 245W, Mono, Black):
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Mounting details:
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Energy output estimates are based on general SAP 2009 calculations for a south facing UK tiled roof with a 30° pitch. The SAP 2009 calculation is:
0.8 x kWp x 1073 (S-solar radiation) x 1 (ZPV-overshading factor)
Solar Panels can be mounted in portrait or landscape to fit the available space. The quickest way to use the calculator is to start from the width, then the height of the available mounting area and match the system size from there.
This calculator should only be used for quick reference; please see system design or contact us if you would like more detailed power estimates and roof designs tailored to real roofspaces, factoring in equipment specifications, the arrays location and the roof aspect (E, S, W).
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 4 | 4 | 4.06m | 1.68m | 6.82m sq | 0.98kWp | 841 kWhrs |
| Portrait | 2 | 4 | 8 | 4.06m | 3.37m | 13.68m sq | 1.96kWp | 1682 kWhrs |
| Portrait | 3 | 4 | 12 | 4.06m | 5.06m | 20.54m sq | 2.94kWp | 2524 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Landscape | 1 | 3 | 3 | 5.06m | 1m | 5.06m sq | 0.735kWp | 631 kWhrs |
| Landscape | 2 | 3 | 6 | 5.06m | 2.02m | 10.22m sq | 1.47kWp | 1262 kWhrs |
| Landscape | 3 | 3 | 9 | 5.06m | 3.04m | 15.38m sq | 2.2kWp | 1888 kWhrs |
| Landscape | 4 | 3 | 12 | 5.06m | 4.06m | 20.54m sq | 2.94kWp | 2524 kWhrs |
| Landscape | 5 | 3 | 15 | 5.06m | 5.08m | 25.7m sq | 3.67kWp | 3150 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 5 | 5 | 5.08m | 1.68m | 8.53m sq | 1.22kWp | 1047 kWhrs |
| Portrait | 2 | 5 | 10 | 5.08m | 3.37m | 19.55m sq | 2.45kWp | 2103 kWhrs |
| Portrait | 3 | 5 | 15 | 5.08m | 5.06m | 25.7m sq | 3.67kWp | 3150 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 6 | 6 | 6.1m | 1.68m | 10.25m sq | 1.47Wp | 1262 kWhrs |
| Portrait | 2 | 6 | 12 | 6.1m | 3.37m | 20.56m sq | 2.94kWp | 2524 kWhrs |
| Portrait | 3 | 6 | 18 | 6.1m | 5.06m | 30.87m sq | 4.41kWp | 3786 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Landscape | 1 | 4 | 4 | 6.76m | 1m | 7.92m sq | 0.98kWp | 841 kWhrs |
| Landscape | 2 | 4 | 8 | 6.76m | 2.02m | 13.66m sq | 1.96kWp | 1682 kWhrs |
| Landscape | 3 | 4 | 12 | 6.76m | 3.04m | 23.76m sq | 2.94kWp | 2524 kWhrs |
| Landscape | 4 | 4 | 16 | 6.76m | 4.06m | 27.45m sq | 3.92kWp | 3365 kWhrs |
| Landscape | 5 | 4 | 20 | 6.76m | 5.08m | 34.34m sq | 4.9kWp | 4206 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 7 | 7 | 7.12m | 1.68m | 11.96m sq | 1.71kWp | 1468 kWhrs |
| Portrait | 2 | 7 | 14 | 7.12m | 3.37m | 23.99m sq | 3.43kWp | 2944 kWhrs |
| Portrait | 3 | 7 | 21 | 7.12m | 5.06m | 36.03m sq | 5.14Wp | 4412 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 8 | 8 | 8.14m | 1.68m | 13.68m sq | 1.96kWp | 1682 kWhrs |
| Portrait | 2 | 8 | 16 | 8.14m | 3.37m | 27.43m sq | 3.92kWp | 3365 kWhrs |
| Portrait | 3 | 8 | 24 | 8.14m | 5.06m | 41.19m sq | 5.88kWp | 5047 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Landscape | 1 | 5 | 5 | 8.45m | 1m | 9.9m sq | 1.22kWp | 1047 kWhrs |
| Landscape | 2 | 5 | 10 | 8.45m | 2.02m | 19.8m sq | 2.45kWp | 2103 kWhrs |
| Landscape | 3 | 5 | 15 | 8.45m | 3.04m | 29.7m sq | 3.67kWp | 3150 kWhrs |
| Landscape | 4 | 5 | 20 | 8.45m | 4.06m | 34.31m sq | 4.9kWp | 4206 kWhrs |
| Landscape | 5 | 5 | 25 | 8.45m | 5.08m | 42.93m sq | 6.1kWp | 5236 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 9 | 9 | 9.16m | 1.68m | 17.82m sq | 2.2kWp | 1888 kWhrs |
| Portrait | 2 | 9 | 18 | 9.16m | 3.37m | 35.64m sq | 4.41kWp | 3786 kWhrs |
| Portrait | 3 | 9 | 27 | 9.16m | 5.06m | 53.64m sq | 6.61kWp | 5674 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Landscape | 1 | 6 | 6 | 10.14m | 1m | 10.14m sq | 1.47kWp | 1262 kWhrs |
| Landscape | 2 | 6 | 12 | 10.14m | 2.02m | 20.48m sq | 2.94kWp | 2524 kWhrs |
| Landscape | 3 | 6 | 18 | 10.14m | 3.04m | 30.83m sq | 4.41kWp | 3786 kWhrs |
| Landscape | 4 | 6 | 24 | 10.14m | 4.06m | 41.17m sq | 5.88kWp | 5047 kWhrs |
| Landscape | 5 | 6 | 30 | 10.14m | 5.08m | 51.51m sq | 7.35kWp | 6309 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 10 | 10 | 10.18m | 1.68m | 17.10m sq | 2.45kWp | 2103 kWhrs |
| Portrait | 2 | 10 | 20 | 10.18m | 3.37m | 34.31m sq | 4.9kWp | 4206 kWhrs |
| Portrait | 3 | 10 | 30 | 10.18m | 5.06m | 51.51m sq | 7.35kWp | 6309 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 11 | 11 | 11m | 1.68m | 19.8m sq | 2.69kWp | 2541 kWhrs |
| Portrait | 2 | 11 | 22 | 11m | 3.37m | 39.6m sq | 5.39Wp | 4627 kWhrs |
| Portrait | 3 | 11 | 33 | 11m | 5.06m | 59.4m sq | 8.08kWp | 6936 kWhrs |
| Panel Orientation | No. Panel Rows | No. Panel Columns | Total No. Panels | PV Array Width | PV Array Height | Mounting Area (m2) | Max Power (Wp/kWp) | Output (kWhrs, Year) |
| Portrait | 1 | 12 | 12 | 12.22m | 1.68m | 20.53m sq | 2.94kWp | 2524 kWhrs |
| Portrait | 2 | 12 | 24 | 12.22m | 3.37m | 41.18m sq | 5.88kWp | 5047 kWhrs |
| Portrait | 3 | 12 | 36 | 12.22m | 5.06m | 61.83m sq | 8.82kWp | 7571 kWhrs |
| * Before installing solar panels, make sure you already have the best electricity deal! |
** Compare solar panel quotations from MCS accredited solar PV installers. |
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