SMA Sunny Design — Independent Software Review

Comprehensive design tool for photovoltaic systems.

Compliance Transparency Index

Grade: C — Score: 65/100

Best For

• Solar installers who primarily use SMA inverters and need a free tool to size strings, select inverter models, and generate project documentation for customers.
• Off-grid and hybrid system designers. Sunny Design is one of the few free tools that supports island systems, PV-diesel hybrid configurations, and battery-only designs without PV modules.
• German and European installers who need VDE AR-N 4110 parameterization and RGIE Art. 48 validation built into the design tool at no cost.
• Installers who want a quick second opinion on system sizing. The free access and instant inverter recommendations make it useful for cross-checking designs from other tools.

Not Ideal For

• Teams designing with non-SMA inverters as the primary hardware. Sunny Design only recommends SMA inverter models. Installers using Enphase, SolarEdge, Fronius, or Huawei inverters need a vendor-agnostic tool.
• Sales teams needing customer-facing proposals. Sunny Design produces technical PDF reports, not branded interactive proposals with financing options, e-signatures, or Good/Better/Best pricing. Solargraf or Aurora Solar serve that workflow.
• Installers who need integrated permitting and AHJ compliance. Sunny Design does not generate permit-ready plan sets, single-line diagrams, or electrical calculations for US AHJ submissions.
• Companies requiring a CRM or project management pipeline. Sunny Design is a design tool only. It does not include lead tracking, sales pipeline management, or team collaboration features.

Operational Overview

Pricing Structure

Sunny Design Web (Free): Free with registration

• PV system design with inverter sizing and string optimization
• 3D visual roof planning with shading simulation
• Yield simulation with worldwide meteorological data
• Battery storage and off-grid system design
• Project documentation (PDF and CSV export)
• E-mobility and load profile management

Sunny Design Pro (Free): Free with registration

• All Sunny Design Web features
• Thermal component integration (heat pumps, CHP)
• VDE AR-N 4110 parameterization tools
• Large-scale system design with DC Combiner
• Advanced energy system modeling

Alternative Consideration

Consider switching to PV*SOL: Offers similar design capabilities with different features.

Frequently Asked Questions

Does SMA Sunny Design work with non-SMA inverters?

No. Sunny Design only recommends and sizes SMA inverter models (Sunny Boy, Sunny Tripower, Sunny Island, Sunny Central). However, the PV module database includes panels from all major manufacturers, so you can use any brand of solar panel in your design. If you need a tool that supports inverters from Enphase, SolarEdge, Fronius, or Huawei, use a vendor-agnostic platform like Aurora Solar, Solargraf, or OpenSolar.

Is SMA Sunny Design really free?

Yes. Both Sunny Design Web and Sunny Design Pro are free with registration. There is no subscription fee, no per-project charge, and no paid upgrade tier. Registration requires a name and email address. SMA provides the tool to help installers configure SMA equipment. All features including 3D roof planning, yield simulation, battery storage design, off-grid design, and PDF/CSV export are available at no cost.

What is the difference between SMA Sunny Design and Sunny Design Pro?

Both are free. Sunny Design Web covers standard PV system design: inverter sizing, string optimization, 3D roof planning, yield simulation, battery storage, off-grid systems, and profitability analysis. Sunny Design Pro adds thermal component integration (heat pumps, combined heat and power plants), tools for VDE AR-N 4110 parameterization (German medium-voltage grid code), and large-scale system design with DC Combiner support. Pro is aimed at installers working on full energy systems in the European market.

Can SMA Sunny Design generate permit-ready plan sets?

No. Sunny Design generates technical PDF project reports and CSV device lists, but it does not produce permit-ready single-line diagrams, three-line diagrams, or electrical calculations formatted for AHJ submission. Installers in the US who need permit packages use tools like Solargraf (built-in permitting with 14,000+ AHJ records) or Aurora Solar (automated plan sets). Sunny Design is a configuration and simulation tool, not a permitting platform.

Does SMA Sunny Design support off-grid and hybrid systems?

Yes. Sunny Design is one of the few free tools that handles off-grid island systems, PV-diesel hybrid configurations, and battery-only designs without PV modules. The tool sizes Sunny Island battery inverters for standalone systems and calculates self-sufficiency ratios. Video tutorials on the platform walk through off-grid design workflow. PV-hybrid systems for locations with unreliable grid access are supported for registered users.

How does SMA Sunny Design compare to Aurora Solar or Solargraf?

Sunny Design is a free technical configuration tool focused on SMA equipment. Aurora Solar ($159/month and up) and Solargraf ($2,799/year and up) are paid, vendor-agnostic SaaS platforms with customer-facing proposals, financing integrations, CRM, and permitting. Sunny Design is stronger in off-grid and hybrid design, thermal component modeling (Pro), and German grid compliance. Aurora and Solargraf are stronger in residential sales workflows, shading analysis on complex roofs, and US market features like NEM 3.0 and AHJ compliance. Many installers use Sunny Design alongside a proposal tool.

Can SMA Sunny Design run on an iPad or tablet?

Yes. Sunny Design Web runs in any standard web browser and is optimized for touch interfaces on iPad and Android tablets. No app download is required. The responsive interface supports data entry and 3D roof planning via touch. Project data is saved to your account and syncs across devices. SMA launched the web version in 2012 specifically to support mobile and tablet access for on-site design work.

How accurate is SMA Sunny Design's yield simulation?

Sunny Design uses high-resolution meteorological data for worldwide locations to project annual energy production. The simulation accounts for module orientation, tilt angle, shading losses (calculated per string from the 3D roof model), cable losses, and inverter efficiency curves. Results are specific to the selected SMA inverter model and string configuration. The profitability analysis layer adds feed-in tariffs, self-consumption rates, and investment cost estimates. For bankable yield reports on commercial projects, tools like PVsyst (€845/year) provide more detailed simulation models with uncertainty analysis.

AI Visibility Report

How AI agents (ChatGPT, Perplexity, Claude, others) read this review page in the past 7 days. Updated weekly. View SMA Sunny Design AI Visibility Report.