{
  "schemaVersion": 1,
  "reviewed": "2026-09-21",
  "provider": "European Commission Joint Research Centre, PVGIS",
  "version": "5.3",
  "radiationDatabase": "PVGIS-SARAH3",
  "period": "2005–2023",
  "sourceResolution": "Approximately 5 km solar-radiation grid; not rooftop resolution",
  "rightsUrl": "https://joint-research-centre.ec.europa.eu/photovoltaic-geographical-information-system-pvgis/general-information/usage-conditions-data-protection_en",
  "manualUrl": "https://joint-research-centre.ec.europa.eu/photovoltaic-geographical-information-system-pvgis/using-pvgis-5/pvgis-5-user-manual_en",
  "apiUrl": "https://joint-research-centre.ec.europa.eu/photovoltaic-geographical-information-system-pvgis/using-pvgis-5/api-non-interactive-service_en",
  "model": {
    "peakPowerKw": 1,
    "technology": "crystalline silicon",
    "systemLossPercent": 14,
    "terrainHorizon": true,
    "propertyShadeModelled": false
  },
  "site": {
    "name": "Guernsey",
    "place": "St Peter Port",
    "point": {
      "lat": 49.455,
      "lon": -2.536
    },
    "scenarios": [
      {
        "id": "south-35",
        "label": "South-facing · 35° tilt",
        "angle": 35,
        "aspect": 0,
        "mounting": "free",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=35&aspect=0&pvtechchoice=crystSi&mountingplace=free&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 1167.63,
        "annualVariationKwh": 38.94,
        "annualIrradiationKwhM2": 1419.42,
        "totalLossPercent": -17.74,
        "months": [
          {
            "month": 1,
            "energyKwh": 37.36,
            "dailyKwh": 1.21,
            "irradiationKwhM2": 44.07,
            "variationKwh": 5.76
          },
          {
            "month": 2,
            "energyKwh": 58.51,
            "dailyKwh": 2.09,
            "irradiationKwhM2": 68.52,
            "variationKwh": 11.13
          },
          {
            "month": 3,
            "energyKwh": 96.59,
            "dailyKwh": 3.12,
            "irradiationKwhM2": 113.91,
            "variationKwh": 14.35
          },
          {
            "month": 4,
            "energyKwh": 137.52,
            "dailyKwh": 4.58,
            "irradiationKwhM2": 164.66,
            "variationKwh": 15.02
          },
          {
            "month": 5,
            "energyKwh": 145.57,
            "dailyKwh": 4.7,
            "irradiationKwhM2": 177.47,
            "variationKwh": 13.09
          },
          {
            "month": 6,
            "energyKwh": 143.56,
            "dailyKwh": 4.79,
            "irradiationKwhM2": 177.37,
            "variationKwh": 14.39
          },
          {
            "month": 7,
            "energyKwh": 149.78,
            "dailyKwh": 4.83,
            "irradiationKwhM2": 186.99,
            "variationKwh": 11.82
          },
          {
            "month": 8,
            "energyKwh": 133.38,
            "dailyKwh": 4.3,
            "irradiationKwhM2": 165.82,
            "variationKwh": 13.61
          },
          {
            "month": 9,
            "energyKwh": 112.05,
            "dailyKwh": 3.73,
            "irradiationKwhM2": 136.95,
            "variationKwh": 11.51
          },
          {
            "month": 10,
            "energyKwh": 73.7,
            "dailyKwh": 2.38,
            "irradiationKwhM2": 89.13,
            "variationKwh": 9.29
          },
          {
            "month": 11,
            "energyKwh": 44.66,
            "dailyKwh": 1.49,
            "irradiationKwhM2": 53.16,
            "variationKwh": 8.41
          },
          {
            "month": 12,
            "energyKwh": 34.95,
            "dailyKwh": 1.13,
            "irradiationKwhM2": 41.37,
            "variationKwh": 6.6
          }
        ]
      },
      {
        "id": "east-35",
        "label": "East-facing · 35° tilt",
        "angle": 35,
        "aspect": -90,
        "mounting": "free",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=35&aspect=-90&pvtechchoice=crystSi&mountingplace=free&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 900.56,
        "annualVariationKwh": 34.2,
        "annualIrradiationKwhM2": 1114.69,
        "totalLossPercent": -19.21,
        "months": [
          {
            "month": 1,
            "energyKwh": 19.62,
            "dailyKwh": 0.63,
            "irradiationKwhM2": 25.65,
            "variationKwh": 2.08
          },
          {
            "month": 2,
            "energyKwh": 35.35,
            "dailyKwh": 1.26,
            "irradiationKwhM2": 43.75,
            "variationKwh": 5.56
          },
          {
            "month": 3,
            "energyKwh": 68.08,
            "dailyKwh": 2.2,
            "irradiationKwhM2": 81.95,
            "variationKwh": 8.68
          },
          {
            "month": 4,
            "energyKwh": 107.84,
            "dailyKwh": 3.59,
            "irradiationKwhM2": 129.93,
            "variationKwh": 10.17
          },
          {
            "month": 5,
            "energyKwh": 126.89,
            "dailyKwh": 4.09,
            "irradiationKwhM2": 154.79,
            "variationKwh": 11.94
          },
          {
            "month": 6,
            "energyKwh": 129.71,
            "dailyKwh": 4.32,
            "irradiationKwhM2": 160.24,
            "variationKwh": 13.6
          },
          {
            "month": 7,
            "energyKwh": 133.79,
            "dailyKwh": 4.32,
            "irradiationKwhM2": 167,
            "variationKwh": 10.47
          },
          {
            "month": 8,
            "energyKwh": 110.48,
            "dailyKwh": 3.56,
            "irradiationKwhM2": 137.8,
            "variationKwh": 9.36
          },
          {
            "month": 9,
            "energyKwh": 81.04,
            "dailyKwh": 2.7,
            "irradiationKwhM2": 100.54,
            "variationKwh": 6.93
          },
          {
            "month": 10,
            "energyKwh": 47.24,
            "dailyKwh": 1.52,
            "irradiationKwhM2": 59.51,
            "variationKwh": 4.48
          },
          {
            "month": 11,
            "energyKwh": 24.16,
            "dailyKwh": 0.81,
            "irradiationKwhM2": 31.45,
            "variationKwh": 3.31
          },
          {
            "month": 12,
            "energyKwh": 16.34,
            "dailyKwh": 0.53,
            "irradiationKwhM2": 22.09,
            "variationKwh": 1.99
          }
        ]
      },
      {
        "id": "west-35",
        "label": "West-facing · 35° tilt",
        "angle": 35,
        "aspect": 90,
        "mounting": "free",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=35&aspect=90&pvtechchoice=crystSi&mountingplace=free&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 937.24,
        "annualVariationKwh": 26.45,
        "annualIrradiationKwhM2": 1157.17,
        "totalLossPercent": -19.01,
        "months": [
          {
            "month": 1,
            "energyKwh": 19.79,
            "dailyKwh": 0.64,
            "irradiationKwhM2": 25.92,
            "variationKwh": 1.98
          },
          {
            "month": 2,
            "energyKwh": 35.14,
            "dailyKwh": 1.26,
            "irradiationKwhM2": 43.45,
            "variationKwh": 4.9
          },
          {
            "month": 3,
            "energyKwh": 70.59,
            "dailyKwh": 2.28,
            "irradiationKwhM2": 84.76,
            "variationKwh": 8.82
          },
          {
            "month": 4,
            "energyKwh": 112.58,
            "dailyKwh": 3.75,
            "irradiationKwhM2": 135.35,
            "variationKwh": 11.72
          },
          {
            "month": 5,
            "energyKwh": 132.76,
            "dailyKwh": 4.28,
            "irradiationKwhM2": 161.56,
            "variationKwh": 11.65
          },
          {
            "month": 6,
            "energyKwh": 136.57,
            "dailyKwh": 4.55,
            "irradiationKwhM2": 168.25,
            "variationKwh": 12.83
          },
          {
            "month": 7,
            "energyKwh": 138.2,
            "dailyKwh": 4.46,
            "irradiationKwhM2": 172.14,
            "variationKwh": 10.12
          },
          {
            "month": 8,
            "energyKwh": 115.66,
            "dailyKwh": 3.73,
            "irradiationKwhM2": 144.03,
            "variationKwh": 11.71
          },
          {
            "month": 9,
            "energyKwh": 86.1,
            "dailyKwh": 2.87,
            "irradiationKwhM2": 106.37,
            "variationKwh": 7.84
          },
          {
            "month": 10,
            "energyKwh": 48.47,
            "dailyKwh": 1.56,
            "irradiationKwhM2": 60.93,
            "variationKwh": 5.31
          },
          {
            "month": 11,
            "energyKwh": 24.39,
            "dailyKwh": 0.81,
            "irradiationKwhM2": 31.63,
            "variationKwh": 3.27
          },
          {
            "month": 12,
            "energyKwh": 16.99,
            "dailyKwh": 0.55,
            "irradiationKwhM2": 22.8,
            "variationKwh": 2.34
          }
        ]
      },
      {
        "id": "south-15",
        "label": "South-facing · 15° tilt",
        "angle": 15,
        "aspect": 0,
        "mounting": "free",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=15&aspect=0&pvtechchoice=crystSi&mountingplace=free&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 1102.64,
        "annualVariationKwh": 35.15,
        "annualIrradiationKwhM2": 1347.42,
        "totalLossPercent": -18.17,
        "months": [
          {
            "month": 1,
            "energyKwh": 28.57,
            "dailyKwh": 0.92,
            "irradiationKwhM2": 35.19,
            "variationKwh": 3.77
          },
          {
            "month": 2,
            "energyKwh": 47.73,
            "dailyKwh": 1.7,
            "irradiationKwhM2": 57.1,
            "variationKwh": 8.11
          },
          {
            "month": 3,
            "energyKwh": 86.23,
            "dailyKwh": 2.78,
            "irradiationKwhM2": 102.28,
            "variationKwh": 11.72
          },
          {
            "month": 4,
            "energyKwh": 131.31,
            "dailyKwh": 4.38,
            "irradiationKwhM2": 157.04,
            "variationKwh": 13.62
          },
          {
            "month": 5,
            "energyKwh": 148.15,
            "dailyKwh": 4.78,
            "irradiationKwhM2": 179.95,
            "variationKwh": 13.2
          },
          {
            "month": 6,
            "energyKwh": 149.74,
            "dailyKwh": 4.99,
            "irradiationKwhM2": 184.18,
            "variationKwh": 14.82
          },
          {
            "month": 7,
            "energyKwh": 154.45,
            "dailyKwh": 4.98,
            "irradiationKwhM2": 191.95,
            "variationKwh": 12
          },
          {
            "month": 8,
            "energyKwh": 131.41,
            "dailyKwh": 4.24,
            "irradiationKwhM2": 163.03,
            "variationKwh": 12.72
          },
          {
            "month": 9,
            "energyKwh": 102.48,
            "dailyKwh": 3.42,
            "irradiationKwhM2": 125.54,
            "variationKwh": 9.59
          },
          {
            "month": 10,
            "energyKwh": 62.4,
            "dailyKwh": 2.01,
            "irradiationKwhM2": 76.57,
            "variationKwh": 6.9
          },
          {
            "month": 11,
            "energyKwh": 34.68,
            "dailyKwh": 1.16,
            "irradiationKwhM2": 42.76,
            "variationKwh": 5.7
          },
          {
            "month": 12,
            "energyKwh": 25.49,
            "dailyKwh": 0.82,
            "irradiationKwhM2": 31.83,
            "variationKwh": 4.1
          }
        ]
      },
      {
        "id": "south-60",
        "label": "South-facing · 60° tilt",
        "angle": 60,
        "aspect": 0,
        "mounting": "free",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=60&aspect=0&pvtechchoice=crystSi&mountingplace=free&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 1099.75,
        "annualVariationKwh": 38.57,
        "annualIrradiationKwhM2": 1334.64,
        "totalLossPercent": -17.6,
        "months": [
          {
            "month": 1,
            "energyKwh": 42.52,
            "dailyKwh": 1.37,
            "irradiationKwhM2": 49.49,
            "variationKwh": 7.18
          },
          {
            "month": 2,
            "energyKwh": 63.41,
            "dailyKwh": 2.26,
            "irradiationKwhM2": 73.86,
            "variationKwh": 12.98
          },
          {
            "month": 3,
            "energyKwh": 96.68,
            "dailyKwh": 3.12,
            "irradiationKwhM2": 114,
            "variationKwh": 15.32
          },
          {
            "month": 4,
            "energyKwh": 127.77,
            "dailyKwh": 4.26,
            "irradiationKwhM2": 153.26,
            "variationKwh": 14.42
          },
          {
            "month": 5,
            "energyKwh": 125.37,
            "dailyKwh": 4.04,
            "irradiationKwhM2": 153.41,
            "variationKwh": 11.16
          },
          {
            "month": 6,
            "energyKwh": 119.62,
            "dailyKwh": 3.99,
            "irradiationKwhM2": 148.6,
            "variationKwh": 11.85
          },
          {
            "month": 7,
            "energyKwh": 126.69,
            "dailyKwh": 4.09,
            "irradiationKwhM2": 158.86,
            "variationKwh": 9.83
          },
          {
            "month": 8,
            "energyKwh": 119.65,
            "dailyKwh": 3.86,
            "irradiationKwhM2": 149.14,
            "variationKwh": 12.67
          },
          {
            "month": 9,
            "energyKwh": 109.24,
            "dailyKwh": 3.64,
            "irradiationKwhM2": 133.65,
            "variationKwh": 12.02
          },
          {
            "month": 10,
            "energyKwh": 77.52,
            "dailyKwh": 2.5,
            "irradiationKwhM2": 93.41,
            "variationKwh": 10.68
          },
          {
            "month": 11,
            "energyKwh": 50.26,
            "dailyKwh": 1.68,
            "irradiationKwhM2": 59.2,
            "variationKwh": 10.28
          },
          {
            "month": 12,
            "energyKwh": 41.03,
            "dailyKwh": 1.32,
            "irradiationKwhM2": 47.78,
            "variationKwh": 8.43
          }
        ]
      },
      {
        "id": "south-35-integrated",
        "label": "South-facing · 35° · building-integrated",
        "angle": 35,
        "aspect": 0,
        "mounting": "building",
        "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=49.455&lon=-2.536&peakpower=1&loss=14&angle=35&aspect=0&pvtechchoice=crystSi&mountingplace=building&raddatabase=PVGIS-SARAH3&usehorizon=1&outputformat=json",
        "annualKwh": 1131.68,
        "annualVariationKwh": 37.14,
        "annualIrradiationKwhM2": 1419.42,
        "totalLossPercent": -20.27,
        "months": [
          {
            "month": 1,
            "energyKwh": 36.68,
            "dailyKwh": 1.18,
            "irradiationKwhM2": 44.07,
            "variationKwh": 5.57
          },
          {
            "month": 2,
            "energyKwh": 57.14,
            "dailyKwh": 2.04,
            "irradiationKwhM2": 68.52,
            "variationKwh": 10.74
          },
          {
            "month": 3,
            "energyKwh": 93.87,
            "dailyKwh": 3.03,
            "irradiationKwhM2": 113.91,
            "variationKwh": 13.72
          },
          {
            "month": 4,
            "energyKwh": 132.8,
            "dailyKwh": 4.43,
            "irradiationKwhM2": 164.66,
            "variationKwh": 14.27
          },
          {
            "month": 5,
            "energyKwh": 140.61,
            "dailyKwh": 4.54,
            "irradiationKwhM2": 177.47,
            "variationKwh": 12.45
          },
          {
            "month": 6,
            "energyKwh": 138.62,
            "dailyKwh": 4.62,
            "irradiationKwhM2": 177.37,
            "variationKwh": 13.54
          },
          {
            "month": 7,
            "energyKwh": 144.56,
            "dailyKwh": 4.66,
            "irradiationKwhM2": 186.99,
            "variationKwh": 11.05
          },
          {
            "month": 8,
            "energyKwh": 128.89,
            "dailyKwh": 4.16,
            "irradiationKwhM2": 165.82,
            "variationKwh": 12.88
          },
          {
            "month": 9,
            "energyKwh": 108.54,
            "dailyKwh": 3.62,
            "irradiationKwhM2": 136.95,
            "variationKwh": 10.99
          },
          {
            "month": 10,
            "energyKwh": 71.85,
            "dailyKwh": 2.32,
            "irradiationKwhM2": 89.13,
            "variationKwh": 8.89
          },
          {
            "month": 11,
            "energyKwh": 43.76,
            "dailyKwh": 1.46,
            "irradiationKwhM2": 53.16,
            "variationKwh": 8.16
          },
          {
            "month": 12,
            "energyKwh": 34.36,
            "dailyKwh": 1.11,
            "irradiationKwhM2": 41.37,
            "variationKwh": 6.43
          }
        ]
      }
    ]
  },
  "calculation": "All raw energy outputs are for 1 kWp. Displayed size examples multiply energy and variability by the selected kWp; irradiation per square metre is not scaled.",
  "limitations": "One regional example point, not a property or parish assessment. Terrain horizon only, not surveyed roof shading. Historical model variation is not a forecast or confidence interval."
}