Erebus Solar
On-site solar shade capture
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Measure shade on site with the hardware already in your pocket.
Erebus Solar was designed by an electrical engineer and an architect with years of experience designing solar systems around the world. We were fed up with the horizon-finding hardware the industry still relies on: dedicated devices that haven't been meaningfully updated in decades, are slow to use and slow to find a GPS fix, and analog tools that need paper, a pencil and a latitude template that may not exist for your site. Erebus Solar is our answer. Your iPhone already has the camera, compass and sensors the job needs.
WHY HORIZON FILES MATTER
Far-field shading from trees, terrain and neighbouring buildings is one of the largest sources of error in a PV production estimate. A measured horizon profile, captured on site, lets your design software model that shading instead of guessing. Erebus Solar produces horizon files that leading PV design tools such as HelioScope and PVsyst read directly, and PV*SOL accepts the same convention.
CAPTURE
• AR sun path: today's arc, the solstice and equinox arcs and the live sun drawn over the real sky
• Tap the real sun to calibrate the compass to true north
• Automatic sky capture: sweep the envelope band and frames capture themselves, no buttons
• Sky Editor: review the stitched sky and trace obstructions by hand, so the report reflects what you saw
ANALYSE
• Annual solar access and TSRF for each array area
• Month-by-month charts and the sun-path chart with your obstructions
• Aerial view with each area's boundary and the solar envelope over satellite imagery
EXPORT
• PDF shade report with your company name and logo
• Horizon files for HelioScope, PVsyst and PV*SOL, generated from the same capture
• Share straight from the phone
ORGANISE
• One project per site, located by address or GPS, with status from Created to Completed
• Areas for each roof face or ground section
• Everything stored on your iPhone: no account, no upload
Erebus Solar's outputs are a design aid for qualified professionals. Results depend on the phone's sensors, compass calibration and sky conditions; check them against your own observations and your design tool's simulation before relying on them.
Privacy Policy: https://erebussolar.app/privacy
Terms of Use: https://erebussolar.app/terms
Sky Editor: obstructions painted across North (Southern Hemisphere sites) now fill correctly.
The developer, Todd Evans, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Todd Evans
- Size
- 19.9 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Erebus Solar, LLC