Display fixed or seasonal panel tilt angles entered for a scenario.
Inputs and method
Fixed mode repeats one entered angle. Seasonal mode displays entered winter, spring/autumn, and summer angles. For the daylight geometry behind seasonal angles, see the daylight hours calculator.
All empirical factors, rates, percentages, clearances, product yields, and model values shown as inputs are scenario values supplied by you. Their source or measurement basis appears beside the inputs and result. Units remain visible, calculations use unrounded values, and rounding occurs only for display or a whole-package ceiling.
Interpreting the result
It does not derive tilt from latitude and does not label an angle optimal or predict yield/performance.
Treat scenario ranges as sensitivity ranges, not confidence intervals. Check the factor’s version, geography, population or product, system boundary, and date before using the result. A numerical result does not establish code compliance, certification, safety, forecast accuracy, or model validity. For the energy and emissions consequences of a chosen tilt, pair this page with the solar panel energy scenario calculator and the solar panel carbon offset calculator.
Validation and rounding
Blank required factors, invalid numbers, prohibited negatives, impossible relationships, and unsupported modes trigger a validation message. Results are rounded as stated; package quantities round up only after waste is applied.
Worked example
A fixed entry of 40° displays 40.0°. Seasonal entries of 55°, 40°, and 25° display in winter / spring-autumn / summer order; hidden fields do not participate.
Frequently asked question
Does this optimize solar yield? No. It displays fixed or seasonal angles supplied by you or an installer.
Sources
- U.S. DOE, “Homeowner’s Guide to Going Solar” — current web edition; system-design overview, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.
- U.S. DOE, “Energy Saver Guide” — 2022 edition; home-energy and solar sections, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.