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Power forecasts for rooftop solar installations using the latest satellite data, worldwide
Solcast gathers the latest satellite imagery from five weather satellites in order to model and forecast PV power generation across the planet. Every 5-15 minutes we detect the latest cloud cover conditions nearby your rooftop power generation site(s), and run sophisticated prediction algorithms to anticipate where the cloud cover will move next. Using PV power modelling tools, we convert the predictions of local cloud cover into forecasts of power output from each Rooftop PV system registered in our API Toolkit.
Access to Rooftop Solar Forecasts
To access Rooftop Solar PV forecasting data, start by creating a free account in our API Toolkit. We include both ‘commercial’ user and ‘home PV system’ account types, and will provide free forecasting data for your personal rooftop solar installation.
Upon registration, you will have two options for retrieving Rooftop Solar data.
Option 1: The first way to access the data are Rooftop Solar Sites.
Upon login to the API Toolkit, navigate to the “Rooftop” section and select “Add site”.
This action will prompt you to add some basic information about your Rooftop Solar PV installation. This includes the name, location, capacity and installation date. Once completed, this will trigger the creation of a new ‘site’ in our API system, which you can use to instantly retrieve both live (real-time back through 7 days) and forecast (present time to 7 days ahead) power output estimates at 30 minute time resolution.
Once you’ve created a site, you’ll also have the option to upload your PV system measurements to leverage our PV Tuning technologies.
Option 2: World API
For users who have a large number of sites, or whose locations of interest change over time, and don’t have a need to upload measurement data, our World PV Power API may be of interest.
With this data product, users can instantly retrieve live or forecast PV power data from anywhere in the world at 30-minute resolution using a location (latitude and longitude) and basic PV system information (AC capacity, efficiency factor, azimuth, tilt). The World API still receives rapid update service, with new data flowing into the forecast and live data with each new satellite scan.
Pricing for the World API starts at $370USD/per month for 10,000 API calls, and your first month is free. The World API also includes access to solar irradiance data, and you can add 10,000 API calls for only $2OUSD each. See our pricing page for more details.
In the table below are our indicative specifications. Once you’ve created your free API Toolkit account and first Rooftop Solar Site, you’ll be able to download our data for testing and review our detailed API documentation.
|Rooftop Solar Sites (Home PV System)||World PV Power API|
|Prices||Free for your verified home residence||$370/month|
|Pricing model||10 API requests per site per day||Flat fee for 10,000 API requests |
Add 10,000 calls for $20
|Parameters|| Live & Forecast: |
|Time Resolution||30 minutes|
|Update Frequency||Every 5-15 minutes (Rapid Update)|
|Timespan|| Live: |
7 days ago to present time
Present time to +7 days ahead
|Coverage||All continents (except Antarctica)|
|File Format||CSV JSON XML|
Site Specifications - Rooftop Solar Sites
To enable the Rooftop Solar Sites product for your site, we’ll require some information about your system layout, including its AC/DC capacity and installation date. Additionally, if you want to enable PV Tuning, we’ll require some historical power output data. The World PV Power API requires some basic PV installation information, and does not allow for PV Tuning.
|Rooftop Solar Sites||World PV Power API|
|Required||latitude, longitude, DC and AC capacity, azimuth, tilt||latitude, longitude, AC capacity|
|Optional||Installation date, efficiency factor||azimuth, tilt, efficiency factor|
|Measurement Data Parameters||Required |
Total power output (MW)
|Does not apply|
|Measurement Data Period||6 weeks minimum |
12 months optimal
|Does not apply|
|Measurement Data Resolution||30 minutes (maximum) |
10 minutes (optimal)
5 minutes (minimum)
|Does not apply|
The Rooftop Solar Sites product includes:
- The ability to detect site specifications from PV measurement data (AC/DC capacity, azimuth, tilt)
- Detection of shading, soiling and other site-specific factors that influence power output
- Automated POSTing of PV measurement data to the API service
- Guaranteed privacy for your uploaded PV measurement data
- The ability for users to permanently delete uploaded PV measurement data
Access to Solcast’s Rooftop Solar data is just a few clicks away
It’s our aim to make access to high quality solar power forecasting easy and straightforward. With our API Toolkit, you are only a few clicks away from creating your own free account. Create your own Rooftop Solar site, watch the power output forecast graphs change in real-time and upload your measurement data to improve the predictions. The API Toolkit makes it easy to learn about how to retrieve the data you need from our APIs.