Fetch solar irradiance and weather forecast data for a PV site using the Open-Meteo API.
domain: open-meteo.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Send a GET request to api.open-meteo.com/v1/forecast with latitude and longitude query parameters.
Add an hourly parameter list including shortwave_radiation, direct_radiation, diffuse_radiation, direct_normal_irradiance, and global_tilted_irradiance.
For global_tilted_irradiance, also supply the panel tilt and azimuth parameters so the value reflects the actual mounting orientation.
Parse the returned JSON hourly arrays, matching each value to its timestamp.
No API key or auth header is needed for non-commercial use; commercial/high-volume use requires a paid plan.
Known gotchas
direct_normal_irradiance and global_tilted_irradiance are documented as hour-ending averages while some other variables are instant/period-start values — misaligning these causes off-by-one-hour errors.
Without explicit tilt/azimuth parameters, global_tilted_irradiance falls back to defaults rather than the actual array orientation.
The free tier is rate-limited and intended for non-commercial use; heavy production workloads should use a paid/API-key plan.
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