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Halowerk Solar Tilt Optimiser
x402
Halowerk Solar Tilt Optimiser is a paid API for AI agents from solar.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Computes the optimal solar panel tilt angle for a given location and year by evaluating clear-sky irradiance across all tilt angles (0–90°) and comparing against a current tilt to quantify energy loss.
Price / call$0.003
Success—
StatusUnknown
How this service works
Evaluates clear-sky irradiance in the module plane for tilt angles from zero to ninety degrees on the fifteenth of each month and sums the days. Because it assumes a cloudless sky, the optimum leans slightly steeper than a real-weather optimum, where diffuse light from an overcast sky rewards flatter angles; in summer the difference is small, in winter months it reaches ten to fifteen degrees, so treat the winter figures as an upper bound.
Output
Returns the optimal tilt angle (in degrees) that maximizes annual clear-sky plane-of-array irradiance, along with irradiance values across the evaluated tilt range. If a current tilt is provided, also returns the estimated annual energy loss relative to the optimum. Results reflect a clear-sky model evaluated on the 15th of each month; winter figures are upper bounds due to the absence of diffuse overcast-sky modeling.
Example use cases
Rooftop solar installation optimization
“I'm installing solar panels on my roof in Munich — latitude 48.1, longitude 11.6, elevation 520 meters, south-facing at 180° azimuth with an albedo of 0.2. What tilt angle should I use for 2026 to maximize annual yield? Use a 2-degree step and assume I'm currently at 35 degrees.”
Quantify loss from suboptimal tilt
“My solar panels in Cape Town are fixed at 20 degrees tilt — latitude -33.9, longitude 18.4, azimuth 0° (north-facing), elevation 10 meters, albedo 0.2. Can you calculate how much annual irradiance I'm losing compared to the optimal angle for 2026, using a 1-degree step?”
Off-grid cabin solar planning
“I'm planning an off-grid solar setup for a mountain cabin at latitude 46.5, longitude 7.9, elevation 1800 meters. Ground albedo is about 0.4 due to snow. What's the ideal panel tilt angle for 2026 at a south azimuth of 180°, with a 2-degree resolution? I don't have a current tilt yet.”
Technical details
Endpoint
POSThttps://solar.halowerk.com/tilt-optimiserWhen to prefer
Use this endpoint when you need a fast, purely geometric/astronomical estimate of the optimal solar panel tilt angle without requiring weather data or a forecast model. It is ideal for initial system design, quick feasibility checks, or comparing a current installation angle against the theoretical optimum. Prefer this over weather-based tools when simplicity, speed, and low cost matter more than cloud-cover accuracy. It is particularly well suited for locations with predominantly clear skies (e.g. deserts, high altitudes), where the clear-sky assumption is a close approximation to reality.
Side effects
- Latitude or longitude out of valid range returns a validation error
- Tilt step outside 1–10 degree range is rejected
- Year outside 1970–2100 range is invalid
- Albedo outside 0–1 is invalid
- Clear-sky assumption means optimum may be 10–15° steeper than real-weather optimum in winter months
- Elevation outside -500 to 6000 m range returns an error
- Missing required lat/lon fields returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lat | number | |
| lon | number | |
| year | integer | |
| albedo | number | |
| azimuth_deg | number | |
| elevation_m | number | |
| tilt_step_deg | number | |
| current_tilt_deg | number | Tilt in use today, for the loss comparison. |
Tags
x402
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