CanadianSolar/CASSYS

CASSYS Engine is a grid-connected photovoltaic system modeling software designed to simulate solar energy performance. It provides a simulation core that handles astronomical calculations, shading, spectral effects, and bifacial panel modeling, alongside AC wiring loss and inverter logic. The system offers a user interface for configuring site-specific parameters and bifacial settings, supported by sample projects and climate data for immediate use.

The installation package now includes a BSD-style license file for CanadianSolar and a new sample project file ('Sample Site - Toronto.csyx') configured for a grid-connected system in Toronto, Canada, along with the corresponding CWEC climate data file. This provides users with a pre-configured example site to reference or modify for their own solar energy system simulations.

CASSYS Installed Files · high confidence

This entry introduces the foundational CASSYS Engine, a grid-connected PV system modeling software. The diff adds the complete source code for the simulation core, including classes for astronomical calculations (Astro), back-side irradiance and bifacial modeling (BackTilter), AC wiring loss calculations (ACWiring), and ASTM E2848 performance testing (ASTME2848). It also includes the main application entry point (CASSYSClass) supporting batch and variable parameter modes, a comprehensive error logging system (ErrorLogger), and the primary simulation orchestrator (GridConnectedSystem) that integrates shading, spectral effects, and inverter logic. Project configuration files (.sln, .csproj.user) and a .gitignore are also added to establish the build environment.

CASSYS Engine · high confidence

The CASSYS Interface now includes a dedicated BifacialSht worksheet that allows users to enable the bifacial panel model and configure albedo input frequency (Yearly, Monthly, Site, or From Climate File), with the interface dynamically showing or hiding relevant fields based on the selection. Additionally, the CheckBoxModule has been updated to include a BifacialChkBox\_Click handler, enabling users to control the visibility and summarization of bifacial-specific outputs in the results file alongside other system parameters.

CASSYS Interface · high confidence

A change to existing behaviour in Documents and Help/images — 3 commits, 3 files.

Documents and Help/images · medium confidence · unverified

The CASSYS Engine project file has been added, defining a .NET Framework 4.5.2 executable that includes source files for simulation components such as trackers, inverters, and spectral effects, along with standard system references.

(dependencies) · medium confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 48 → 44 (-3.6)
• Rubric changed (rubric-2026.08.20 → rubric-2026.09.16) — scores are not directly comparable.

• Code Health 83 → 60 (-22.6)
• Architecture 100 → 100 (+0.0)
• Maturity 46 → 46 (+0.0)
• Readiness 24 → 24 (+0.0)
• Security 100 → 95 (-5.0)

• Build did not complete in the analyzer
• CommentedOutCode (CASSYS Engine/Transformer.cs)
• Duplicated block (10 lines × 2) (CASSYS Engine/BackTilter.cs)
• Duplicated block (10 lines × 2) (CASSYS Engine/Interpolate.cs)
• Duplicated block (11 lines × 2) (CASSYS Engine/RadiationProc.cs)
• Duplicated block (12 lines × 3) (CASSYS Engine/Shading.cs)
• Duplicated block (13 lines × 2) (CASSYS Engine/Shading.cs)
• Duplicated block (25 lines × 2) (CASSYS Engine/GroundShading.cs)
• Duplicated block (27 lines × 2) (CASSYS Engine/Tracker.cs)
• Duplicated block (5 lines × 2) (CASSYS Engine/Interpolate.cs)
• Duplicated block (5 lines × 2) (CASSYS Engine/PVArray.cs)
• Duplicated block (5 lines × 2) (CASSYS Engine/RadiationProc.cs)
• LLM evaluation failed
• No exposed public API
• dormant codebase — no living knowledge left to concentrate

• Dead code: CASSYSBlankXMLException (CASSYS Engine/ErrorLogger.cs)
• Dead code: GetTiltIrradHay (CASSYS Engine/Tilter.cs)
• Dead code: GetTiltIrradPerez (CASSYS Engine/Tilter.cs)
• Dead code: GetTimeHA (CASSYS Engine/Astro.cs)
• Dead code: PrintModel (CASSYS Engine/BackTilter.cs)
• Dead code: PrintModel (CASSYS Engine/GroundShading.cs)
• Dead code: QuoteValue (CASSYS Engine/CASSYSClass.cs)
• Documentation: no installation or build instructions (README.md)
• Documentation: no usage examples (README.md)
• Duplicated block (10 lines × 2) (CASSYS Engine/Interpolate.cs)
• Duplicated block (11 lines × 2) (CASSYS Engine/BackTilter.cs)
• Duplicated block (11 lines × 2) (CASSYS Engine/RadiationProc.cs)
• Duplicated block (17–18 lines × 3) (CASSYS Engine/Shading.cs)
• Duplicated block (25 lines × 2) (CASSYS Engine/GroundShading.cs)
• Duplicated block (25 lines × 2) (CASSYS Engine/Shading.cs)
• Duplicated block (2–5 lines × 4) (CASSYS Engine/Interpolate.cs)
• Duplicated block (30–32 lines × 2) (CASSYS Engine/Tracker.cs)
• Duplicated block (5 lines × 2) (CASSYS Engine/PVArray.cs)
• Duplicated block (5 lines × 2) (CASSYS Engine/RadiationProc.cs)
• Medium: security finding (details withheld)
• …and 2 more

• Unchanged — 1 containers · 0 contexts · 0 edges

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

CanadianSolar/CASSYS was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.