Top 10 Best Solar Calculation Software of 2026

SunDAT supports module layout and stringing oriented PV design workflows, then ties results to energy yield estimation and loss breakdown reporting. The tool’s workflow is geared toward engineers who need to iterate tilt, azimuth, and shading assumptions while keeping the electrical sizing context consistent. It also supports horizon file import and terrain-driven context so shading impacts reflect the modeled environment. Export output can move into common document and design pipelines through file generation for diagrams and reports.

A practical tradeoff is that richer modeling choices increase setup time because horizon and terrain inputs must be curated before early iterations. SunDAT fits teams that start with a site context file set and then run multiple system configurations to compare yield and layout constraints. It also fits organizations that need repeatable report generation for standardized project submissions without manually reassembling inputs each time.

Polysun’s core calculation flow starts from a system layout with tilt and azimuth settings, then adds horizon and terrain-related shading inputs to produce yield and loss diagrams. The software generates outputs that map to design documentation needs, including exportable diagrams and engineering summaries used during technical signoff. Its project structure keeps multiple variants together so teams can compare outcomes without rebuilding a model from scratch.

A tradeoff appears in automation depth because Polysun’s integrations and provisioning options are more limited than tools that offer broad API-driven pipelines. Polysun works well when the team runs a controlled design workflow in the GUI for each customer project, then reuses the same assumptions and export formats to keep review packages consistent.

Global Solar Atlas provides global solar resource surfaces paired with site-level calculations that use selected irradiance datasets and typical PV modeling parameters. Outputs commonly include irradiance metrics and energy yield estimates that can be compared across geographies for feasibility and procurement screening. Export options help move results into documents and external spreadsheets for iteration during early PV sizing and design.

A practical tradeoff is that engineering-level layout optimization and detailed loss diagrams are limited compared with dedicated PV design suites that model strings, inverters, and module placement granularities. Global Solar Atlas fits best when teams need many-location energy estimates quickly, such as multi-site interconnection studies or portfolio assessments. The workflow becomes less efficient when a project requires tight string sizing, rapid shutdown layout, or deep CAD-based single-line and module layout deliverables.

Aurora Solar is a solar calculation and design workflow tool that combines PV system modeling with proposal-ready outputs. It supports shading and layout planning workflows that connect 3D terrain context to module placement, then carries results into design documentation.

The software also integrates irradiance data selection for energy yield estimation and supports common export targets used in PV design handoffs. Teams that need repeatable engineering calculations plus customer-facing visuals tend to evaluate Aurora Solar for the end-to-end workflow coverage.

OpenSolar performs PV system sizing and design workflows that combine module and string configuration with energy yield outputs. The software links irradiance inputs to loss modeling, then produces design artifacts such as reports and export formats used in downstream review.

It supports layout planning for tiling, orientation, and installation constraints, which helps teams iterate on string sizing and inverter matching. The overall workflow is geared toward repeatable design outputs rather than ad hoc spreadsheet calculations.

HOMER is used for solar project sizing and energy yield modeling when system design needs to tie PV and storage dispatch to hourly weather and constraints. It calculates energy production and can also model hybrid configurations by simulating load meeting with PV, batteries, and grid or generators.

The workflow supports importing inputs for irradiance and site conditions and then producing design outputs like energy yield and component sizing results. Export options support handoff into downstream design and reporting workflows via common file outputs and report formats.

Solargis focuses on utility-grade solar and PV design workflows that connect irradiance and project parameters into engineering-ready outputs. The toolchain supports energy yield estimation workflows and geospatial inputs for horizon, terrain, and shading characterization.

It also supports PV system sizing through module and string configuration reasoning and produces design deliverables in analysis-friendly report formats. The integration depth centers on data preparation for energy modeling rather than only layout visualization.

SolarEdge Designer targets PV sizing and layout work with inverter-aware workflows that tie module and string decisions to SolarEdge system assumptions. It supports shading and energy yield modeling through 3D terrain and object inputs, then produces design artifacts like loss diagrams and layout exports used for engineering review.

The workflow centers on creating a consistent design case, where geometry inputs flow into string sizing and production estimates without requiring manual re-entry across tools. SolarEdge Designer fits teams that need repeatable PV calculations aligned to SolarEdge project execution rather than generic vendor-neutral studies.

Solargraf calculates PV system designs from a structured project model and turns inputs like roof geometry, module selections, and electrical constraints into sizing outputs and exportable documentation. The workflow centers on module layout planning, string sizing logic, and irradiance data integration for energy yield estimation.

Solargraf also supports graphics output and single-line diagram style deliverables that fit common PV proposal workflows. Administrative governance and API automation matter most when deployments require repeatable project provisioning across multiple designers.

ARKA 360 targets PV system sizing and design workflows with a calculation environment meant for project-grade outputs rather than rough estimates. The tool focuses on modeling layouts and electrical configurations used for string sizing, loss analysis, and energy yield estimation.

It supports report-style deliverables and common modeling inputs used in utility and contractor review cycles. ARKA 360 is a fit when teams need repeatable calculations across many projects and want consistent output formatting for internal and external handoffs.