curl --request POST \
  --url https://api.iotools.cloud/v1/tool/solar-pv-system-sizing-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "dailyUsage": "30",
  "peakSunHours": "4.5",
  "panelWattage": "400",
  "systemEfficiency": "77",
  "dcAcRatio": "1.2",
  "mode": "grid-tied"
}
'

{
  "tool": "solar-pv-system-sizing-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "systemSizeKw": "8.66 kW DC",
    "panelCount": "22 panels (8.80 kW DC actual)",
    "inverterSizeKw": "7.33 kW AC",
    "batterySizing": "N/A — grid-tied systems don't need battery storage",
    "summaryTable": [
      {
        "metric": "Daily energy usage",
        "value": "30.00 kWh/day"
      },
      {
        "metric": "Peak sun hours",
        "value": "4.50 h/day"
      },
      {
        "metric": "System derate factor",
        "value": "77%"
      },
      {
        "metric": "Required array size",
        "value": "8.66 kW DC"
      },
      {
        "metric": "Panels needed",
        "value": "22 × 400 W"
      },
      {
        "metric": "Actual array size",
        "value": "8.80 kW DC"
      },
      {
        "metric": "DC:AC ratio",
        "value": "1.20"
      },
      {
        "metric": "Inverter size",
        "value": "7.33 kW AC"
      }
    ],
    "notes": "Required array size = daily usage ÷ (peak sun hours × derate) = 30.00 kWh ÷ (4.50 h × 0.77) = 8.66 kW DC.\nGrid-tied systems don't need battery storage — excess production exports to the grid, subject to your utility's net-metering rules.\nThis is a rough sizing estimate for planning purposes only — a licensed installer should verify against your roof's actual irradiance, shading and orientation, and local electrical code (e.g. NEC Article 690), before purchase or installation."
  },
  "credits_used": 3,
  "credits_remaining": null
}