Designing PV plants is easier than ever now, with Sunny Design Web. You can open Sunny Design Web in any Web browser or on an iPad/Android tablet. Then simply enter all the required information and within a few minutes you will receive the optimum plant configuration. The Web application provides solar power professionals and plant designers with a user-friendly interface. Along with the technical inspection of different components, the software also provides data for economic evaluation of the plant. The end customer gains a customized PV plant and the solar power professional saves valuable time. Once you have completed the free registration, you will have access to exclusive features to serve you better.

Also available as desktop version.



  • Optimal design for grid-connected PV plants
  • Tips aimed at plant optimization
  • Free registration


  • Database of current PV modules
  • Use of high-resolution meteorological data
  • Generation of design proposals
  • Energetic evaluation of an operational year
  • Forecast of projected self-consumption
  • Custom calculation of the optimum dimensioning for inverters


  • Worldwide location support
  • Import of your own load profiles and meteorological data
  • Access via Web browser, iPad, or Android tablet

Release Notes Sunny Design 3.55 (Web/Desktop)

  • Improved handling of the active power limitation with Sunny Boy 1.5 to 5.0.
  • Load profiles with a time period of seven days can also be imported now. The data are then automatically rounded up to an entire year.
  • The usable battery capacity of the storage system can now be changed for off-grid projects.
  • For the THD calculation the input value of the connectable feed-in power is now validated to prevent miscalculations.
  • For hybrid projects the total minimum load of the gensets is now shown in the project documentation.
  • The specific requirements in the USA regarding UL 1741_SA / Rule 21 can be factored in as country-specific requirements.
  • The information regarding the compatibility of PV inverters with AS-NZS 5033 has been improved.
  • New Sunny Design tutorial videos have been incorporated on the landing page and the personal dashboard.
  • An error when calculating solar fractions of heat pumps was rectified.
  • The import of load profiles from CSV files was improved.
  • An unnecessary status icon of the nominal power ratio was removed in the project documentation.
  • Additional minor error corrections and product improvements.
  • Database changes:
    • New PV inverter: SHP75-10
    • New locations: San Diego (CA, USA) and "Eifel" region (Germany)
    • Updated PV module database (now containing 123,017 PV modules and 1,348 manufacturers).

Release Notes Sunny Design 3.51 (Web/Desktop)

  • Sunny Design now allows to design PV systems containing TS4-R retrofit MLPE components (Module Level Power Electronics) by Tigo Energy.
  • Sunny Design also supports smart modules with Tigo TS4 components.
  • The effects of the various TS4 products on system design and yield estimation are taken into account.
  • New monitoring systems: SMA Com Gateway, Tigo Gateway, Tigo Cloud Connect Advanced.
  • New inverters: SB3.0/3.6/4.0/5.0-1AV-40, SC 1850-US-10
  • Updated PV module database, now also containing the connector type.
  • The new version also contains various minor improvements and bug fixes.

Release Notes Sunny Design 3.50 (Web/Desktop)

  • Full product support for Sunny Boy 5.0/6.0-1SP-US-40 (parallel connection of inputs).
  • Off-grid systems: integration of Sunny Island 4548/6048-US and the Multicluster Box 12U.
  • The limitation of the active power feed-in at the grid-connection point is now being supported by the SMA Cluster Controller.
  • The integration of a heat pump into the energy management of the Sunny Home Manager can now be simulated.
  • An alternative dimensioning factor (peak power / max. inverter AC active power) is now available in the user settings.
  • Designs with central inverters also comprise information about SMA system technology.
  • Updated consideration of the KfW subsidies for energy storage systems (50% cut).
  • The project documentation has been extended to include a page regarding cable dimensioning.
  • The profitability analysis now also includes the storage system costs, annual rate of return and LCOE.
  • Projects can be hidden on the start page via the user settings (e.g. at presentations).
  • Improved presentation of the power tolerance of PV modules.
  • Manual input of battery efficiency.
  • Improved update dialogue regarding the Sunny Design desktop.
  • Different minor improvements and corrections (bug fixes).

Release Notes Sunny Design 3.40 (Web/Desktop)

  • Sunny Design can now be used to design off-grid systems
    • New project type “PV project without grid consumption” with workflow designed specifically for off-grid systems
    • System summary with a presentation of the system status and an assessment of design details
    • System wizard to quickly and easily generate a custom system proposal
    • Support for off-grid multicluster boxes when designing the battery system
    • Support for an optional genset as an additional energy source
    • Redesigned visualization of energy flows in the system
    • Diagram to display the percentage of total monthly energy demand covered by solar power
    • Project documentation specifically for off-grid systems
  • Advanced personal settings
  • Numerous minor improvements and bug fixes

Release Notes Sunny Design 3.30 (Web/Desktop)

  • Calculation of the harmonics (THD calculator)
    • Simple adoption of project data in the calculation
    • Report conforming to VDE-AR-N-4105
    • Output language of the report selectable
    • Replaces the existing EXCEL tool for low-voltage projects
  • Enhancements in the calculation of self-consumption
    • Twelve new load profiles for private households
    • Simultaneous selection of several load profiles in a project
    • Nominal power of the heat pump freely selectable
    • New diagrams show the load profile for one week per season respectively
  • Individual designation of system parts for simpler assignment of the inverters in the line dimensioning
  • Revision of the assistant for PV-hybrid systems
  • Output of further simulation results as a diagram and as a CSV file
  • Support of multi-cluster storage systems with up to 24 Sunny Island devices
  • Selectable number of different inverter types in the design recommendations
  • Scaling of the irradiation data at the project level
  • Printable design comparison
  • Introduction of a new archive format (.SDPA) for the simultaneous export or import of several projects
  • Improvements in the data synchronization
  • Numerous additional improvements and bug fixes

Release Notes Sunny Design 3.20 (Web/Desktop)

  • Additions for the calculation of self-consumption
    • Support for systems with heat pumps for heating as well as warm water
    • Import of load profiles from Sunny Home Manager systems
    • Automatic completion of missing data
    • Load analysis for commercial load profiles
  • Calculation of the efficiency for all project types
    • Consideration of up to three different purchased electricity tariffs
    • Price management for PV modules and inverters
  • Design of decentralized medium-voltage projects
    • System type for medium voltage optionally centralized or decentralized
    • Revised line dimensioning for decentralized medium-voltage projects enables parameter setting for Integrated Plant Control
  • Advanced personal settings
    • Minimum cross-section freely configurable for line dimensioning
    • Preset project type on the home page freely configurable
  • Optimizations for PV hybrid projects
  • Detailed consideration of the generator currents
  • Simple export of several projects as a ZIP archive
  • Support of the parallel connection of several inverter inputs for the inverters FLX PRO 15 and FLX PRO 17
  • Numerous additional improvements and bug fixes

Release Notes Sunny Design 3.10 (Web Version)

  • In Sunny Design there are now three different project types available which are individually tailored to specific requirements: PV system without self-consumption, PV system with self-consumption, and PV hybrid system. These projects are identified in the overviews by corresponding symbols.
  • In the project data it is now possible to enter active power limitation specifications manually within a wide setting range.
  • In projects with self-consumption, the Sunny Home Manager can be used to limit active power, e.g., for implementation of the 70% cap in accordance with the Renewable Energy Sources Act (EEG). This is also taken into account in the yield forecast.
  • Also for projects with self-consumption, a new planning stage has been introduced under the heading "Define load profile". This provides not only a chart of average daily profiles, but also an editor for creating individual load profiles.
  • The design now takes into account the requirements of country-specific standards in Belgium (RGIE), Australia (AS/NZS 5033) and Italy (CEI-021).
  • The new section "Planning of PV system monitoring" provides the possibility of integrating communication products (hardware and software) for system monitoring, system management and visualization of key system data in the PV system. This new function also offers design options based on the specific requirements for PV system monitoring.
  • The sizing of AC cabling now also supports split-phase grids.
  • Project documentation for design alternatives can now be created quickly and easily.
  • The dialog for creating your own PV modules has been optimized. All mandatory specifications have been condensed in one list to facilitate their entry.
  • Missing PV module data can now be transmitted by e-mail via a link on the homepage.
  • The user interface and the documentation are now also available in Japanese.
  • The new version has been prepared for inverters with integrated battery. Their properties will in future be taken into account for design, yield simulation and self-consumption forecasting.

Release Notes Sunny Design 3.02 (Web Version)

  • Sunny Design Web now allows registered users to design PV-hybrid systems in addition to designing normal PV systems. The program interface offers extended input options for this, amongst other things for efficiency aspects, extended input options as well as a visualization of load profiles and the input and configuration of gensets. The program provides support in the determination of the optimum PV contingent in terms of efficiency for the project. The potential fuel- and emission savings will be calculated and displayed on the user interface as well as in the extended project documentation. An analysis will be performed on the efficiency of the fully configured projects, which amongst other things includes the cash flow as well as the amortization period.
  • The altitude of installation will be taken into consideration during the design.
  • In systems with Sunny Central inverters, the altitude dependencies will be taken into consideration during the yield calculation.
  • Via a new editor, individual load profiles can be created conveniently and directly in Sunny Design Web.
  • Meteorological data will be displayed in new diagrams. The diagrams enable a simple determination of the band-width of irradiation and temperature for the selected installation site.

Release Notes Sunny Design 3.01 (Web Version)

  • The design rules have been revised and now allow for a more flexible dimensioning of the module strings. This is based on a reassessment of the design-relevant minimum string voltage and in consideration of the starting voltage of the inverter. You can find more information here: Designing PV Plants Optimised for Economic Efficiency - Technical Information
  • The sorting of the design proposals by economic viability has been improved.
  • The increased self-consumption with battery option is now possible with the Sunny Island 6.0H. The user interface has been extended to display the degree of self-sufficiency and the annual battery cycles. In addition, filtering of the battery system has been made available.
  • Information regarding the available communication interfaces is now displayed in the Sunny Tripower TL-20.
  • The current nominal power behavior of the design is now graphically presented in the String Editor. Also, the connected peak power and number of modules is displayed.
  • The detail-view of the inverter design has been supplemented with additional helpful tool tips.
  • New locations: Chile: Arica, Copiapó, La Serena, Concepción, Temuco. Switzerland: St. Gallen, Frauenfeld. Indonesia: Surabaya, Jakarta, Kuching, Medan, Padang, Palembang, Samarinda. South Korea: Busan, Daejeon, Gwangju