Sun path simulation
Drive the sun position by date and time to see light and shadow change instantly.
Sunlight analysis and solar PV estimates
Free online sunlight analysis and solar PV estimates. Import 3DM, OBJ or DAE models to study shadows and estimate annual energy yield. No install or sign-up.
Architectural shadow analysis
Generate sunlight duration and shadow heatmaps to compare shading across dates, locations and building designs.
PV energy yield calculator
Accumulate hourly radiation over a full year on selected layers to estimate output.
Economic analysis
Automatically compute NPV, ROI, LCOE and simple payback period.
Report export
Export a detailed Excel report with all analysis data in one click.
Frequently asked questions
What can I analyze with Heliodon?
Heliodon provides free online sunlight analysis and solar PV estimates. Use 3D building models to study sun paths, building shadows, sunlight duration and solar radiation, then estimate annual PV energy yield and investment returns.
How does sunlight analysis and PV estimation work?
Import a .3dm, .dae or .obj model and choose an analysis type. Heliodon uses GPU-accelerated rendering to accumulate hourly sunshine duration and plane-of-array (POA) solar radiation, then applies panel efficiency, temperature coefficient and performance ratio (PR) to compute annual PV energy yield.
Which file formats are supported?
Heliodon supports .3dm, .dae and .obj files, including large-scale city and architectural models.
Is Heliodon free, and are my models uploaded to a server?
Heliodon is completely free and runs directly in your browser with no install or account. All models are parsed and rendered locally and never leave your device.