Fronius Solar.web Query API

The essential interface for trade and industry

Two installers using tablet for inverter configuration

Use PV data efficiently with the Solar.web Query API

The Solar.web Query API gives you direct access to all your PV system data. It’s secure, scalable, and there’s no need for additional hardware. Whether you use it for visualization, energy management, or asset reporting, our API is your go-to interface for professional applications.

PV data for VPP, reporting & smart-home solutions

The REST-based interface allows Fronius PV data to be integrated into your own systems and applications with ease. It is suitable for real-time and batch data queries and is ideal for companies that offer monitoring, operation, and maintenance or smart-home solutions.

Areas of application:

  • Visualization of energy flows and consumption data
  • Monitoring and error analysis in operation and maintenance processes
  • Reporting for investors and asset management
  • Virtual power plant (VPP)
Installer with smartphone next to Verto inverter

The benefits of Solar.web Query API

Direct access to PV data
No additional logger or hardware required—data comes directly from Fronius Solar.web.
Flexible integration into your own systems
Use the API for whatever you need it for—from visualization and analysis to control.
Scalable for small and large applications
From individual projects to platform solutions, the API grows with your requirements.
Icon solar panels and sun
Features of Solar.web Query API
REST API with JSON format
Standardized interface for easy integration
Query system and device data
Inverter, storage, meter, and weather data, error codes, and much more at a glance
Aggregated and historical data
View and compare daily, monthly, annual, and real-time data
Notifications & status messages
Access to error and warning messages from PV systems
API key management
Creation and management with Fronius Solar.web user account
Demo access available
Free test with example systems—ideal for getting to grips with the software
Swagger interface for documentation
Interactive API documentation for developers
REST API with JSON format
Standardized interface for easy integration
Query system and device data
Inverter, storage, meter, and weather data, error codes, and much more at a glance
Aggregated and historical data
View and compare daily, monthly, annual, and real-time data
Notifications & status messages
Access to error and warning messages from PV systems
API key management
Creation and management with Fronius Solar.web user account
Demo access available
Free test with example systems—ideal for getting to grips with the software
Swagger interface for documentation
Interactive API documentation for developers

Solar.web Query API access

Criterion  Demo access1

Unlimited access2
Target group  Business customers for testing  Business customers for live use
Access to own PV systems  Only example systems from Fronius Full access to their own systems
Costs  Free of charge Chargeable (according to data package)
Duration  For a limited time only Unlimited after conclusion of contract
Contract required  No Yes (order form + activation) 
Solar.web account required  No Yes
API key management Fronius provides key Self-administration in the API management portal
Functional scope Full range of functions for testing Full range of functions for productive operation
Access requirements None Registration, contract, API key
Requirements for getting started Get started right away Registration + conclusion of contract necessary
Support & scaling Restricted Scalable for professional applications
Data packages (pay-per-use)3 Not available Automatic billing according to data requirements (see order form for prices):
- Basic - 1 - 500,000 data points/month
- Small - 500,001 - 2,500,000 data points/month
- Medium - 2,500,001 - 10,000,000 data points/month
- Large - 10,000,001 - 30,000,000 data points/month
- Advanced - 30,000,001 - 60,000,000 data points/month
- Pro - > 60,000,000 data points/month
Billing - Monthly, automatically according to use

 

1) Free of charge, for a limited time only, access to example systems
2) Contract required, API key creation via Solar.web, access to own systems
3) Billing by data points per month—flexible and transparent

Solar.web Query API is available in the following countries: Albania, Andorra, Anguilla, Antigua and Barbuda, Argentina, Armenia, Aruba, Australia, Austria, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Bermuda, Bonaire, Bosnia and Herzegovina, Bulgaria, Burkina Faso, Cambodia, Chile, Colombia, Croatia, Cuba, Curaçao, Cyprus, Dominica, Dominican Republic, DR Congo, Denmark, Ecuador, Egypt, Estonia, Finland, Georgia, Germany, Ghana, Grenada, Guyana, Haiti, Hong Kong, Hungary, Indonesia, Iraq, Iran, Iceland, Israel, Jamaica, Jordan, Kazakhstan, Kenya, Kosovo, Kuwait, Latvia, Lebanon, Lithuania, Luxembourg, Macedonia, Madagascar, Malawi, Malaysia, Mali, Malta, Moldova, Montenegro, Montserrat, Myanmar, Namibia, Netherlands, New Zealand, Nigeria, Norway, Oman, Pakistan, Palestine, Peru, Philippines, Qatar, Romania, Russia, Saba, Saudi Arabia, Serbia, Singapore, Sint Eustatius, Slovenia, South Africa, South Korea, Sri Lanka, St. Kitts and Nevis, St. Lucia, St. Martin, St. Vincent and the Grenadines, Sweden, Taiwan, Tanzania, Thailand, Trinidad and Tobago, Tunisia, Uganda, United Arab Emirates, Uruguay, US Virgin Islands, Vietnam, Yemen, Zambia, Zimbabwe  

We look forward to receiving your inquiry

First select the country, then, if available, display the corresponding order form for download. Please note that the completed API access form must be sent to the email address indicated in the form. Show contact form for further questions.

We will get in touch with you as soon as possible. Please note that irrespective of which type of access you choose, use of the Solar.web Query API is restricted to business partners (corporate customers).

FAQs

The data points are counted on the basis of the following table:

 

Free data point
The number of requests is not relevant. This data is always free of charge. 
  • Release information
  • Information on the PV system
    - Count System: This counts the number of registered systems
    - List of system IDs
    - Number of guests
    - List of device IDs
One data point
Each fulfilled request counts as one data point (e.g., if 5 requests are fulfilled on one day, 5 data points are calculated for this day). 
  • PV system information
    - Detailed information about PV systems, including but not limited to name, address, peak output, installation date
  • Power flow data, including but not limited to PV power, grid feed-in, power output to loads, self-consumption rate
  • Current weather data
Multiple data points
One channel represents one measured value (e.g., AC voltage for phase 1, AC frequency, total power generated, direct current MPPT1, energy into the grid, etc.). 

Aggregated data: per channel and time stamp

  • A time stamp is defined as a time period: day, month, year, and total service life
  • Calculation: Number of channels * number of time stamps = total data points
  • Example: 5 channels * 2 time stamps = 10 data points
  • Exceptions for aggregated data:
    - CO2 savings (4 channels) count as one data point per time stamp
    - Profits (3 channels) count as one data point per time stamp

Historical data: per channel and time stamp

  • The time stamps are defined by the logging interval configured on the inverter (default: 5-minute interval)
  • Each 5-minute interval is one data point
  • Example: One hour (= 12 x 5 minutes) of historical data for 2 channels would result in 12 x 2 = 24 data points

Service messages: each service message counts as one data point.

Energy forecasts

  • For the next 24 hours: every 15 minutes of the EnergyExport forecast counts as one data point (corresponds to 4 data points per requested hour)
  • For the following 24 hours: every hour of the EnergyExport forecast counts as one data point

Weather forecast

  • One data point per forecasted day
  • Example: 4 forecasted days correspond to 4 data points

 

You will find all the essential information you need for implementing the Solar.web Query API and some helpful application examples in the interface description.
Download interface description