Solcast Products

Evaluate Data Access

Testing the Solcast data API

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Live and Forecast

How often do you update the forecast and live data?Getting started with Rooftop PV sitesWhere do I find my Resource Id?Rooftop PV ModelAdvanced PV Model

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Historical Time Series

Historical Time Series OverviewHistorical Time Series - Time Date FormatsWhat is a Time Series data 'request'? How many 'requests' do I need?Do you store old/historical forecasts?

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Grid Aggregations

Grid Aggregations

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Horizon Angles

Horizon Angles - FAQs

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Historical Forecast

Historical Forecast

Data Modelling

Modelling - FAQs

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Explaining Terms

Glossary of termsAzimuthSolar AzimuthSolar ZenithWhat is Spatial Resolution?Why we don't provide data in local time? Terrain Tilt and AzimuthWhat is tilt? How can I estimate my rooftop solar system's tilt?

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Resolution and Accuracy

Solar Radiation Forecasting and Historical DataGlobal Coverage

Solcast API

What is an API request? How many API requests do I need?

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Documentation

Postman API (Spec) Documentation

Data Parameter DefinitionsAPI Change LogWhat is an API? What is an API key? How do I use my API key?Authentication with the Solcast APIPVsystWhat is the difference between PV, PV10, PV90?

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API Troubleshoot

Data Troubleshooting

Hobbyists and Researchers

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Home Hobbyist Accounts

Home Hobbyists - FAQsIssues adding your 2nd home PV sitePV Tuning DiscontinuedCreating a second PV siteHow do I create a multiple azimuth Rooftop Solar site?How do I delete my account?

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Researchers and Academic Accounts

Researcher - FAQsResearcher and Student access to the Solcast API serviceHow do I cite the Solcast API service in my research work?

Troubleshooting and FAQs

Data Troubleshooting and FAQs

What timezone are the timestamps?

User Guides

Subscription Management

Historical forecasts are not archived

While we don't store old forecasts, Solcast provides forecasting solar data with proven accuracy levels. Learn how you can access them.

Can I access old forecasts? Do you have old forecasts archived? How do I see past forecast data? How accurate are your forecasts?

We do not store our forecasts.

This is simply because of the incredible volume of forecasts we generate - 600 million each hour!

If you are interested in forecasting accuracy, there are a few things you can do:

1. Use the API Toolkit to create a site at your location of interest and then review the 'accuracy' chart which has the 1-hour ahead forecasts for the past 7 days archived. 2. Use the API Toolkit to create a site at your location of interest and begin downloading the forecast data regularly for your own comparison. 3. If you need these data for a project and have budget available, we can offer one-off forecast extracts for you at cost. Get in touch with us to learn more!

• Historical forecasts are not archived