# Services from solar.halowerk.com on Zero

> solar.halowerk.com serves 11 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/solar.halowerk.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/solar.halowerk.com/health.json

## Services

- [Solar Autonomy Forecast](https://www.zero.xyz/c/solar-autonomy-forecast-75724424/llms.txt): $0.003/call via x402. Calculates how many days a battery system can run autonomously given daily solar harvest, load profile, and battery state — no weather data fetched, pure energy balance computation.
- [Halowerk Building Heat Demand Estimator](https://www.zero.xyz/c/halowerk-building-heat-demand-estimator-6c91e1c9/llms.txt): $0.004/call via x402. Computes a transparent planning estimate of annual and monthly space-heating demand for a building in Germany, combining envelope transmission losses, ventilation losses, DWD climate normals, internal gains, and optional DHW.
- [Solar Halowerk Inverter & Cable Loss Calculator](https://www.zero.xyz/c/solar-halowerk-inverter-cable-loss-calculator-e4bfa44d/llms.txt): $0.002/call via x402. Calculates DC cable resistive losses and inverter efficiency losses for a solar power system given cable specs, inverter parameters, battery voltage, and load.
- [Halowerk Solar Tilt Optimiser](https://www.zero.xyz/c/halowerk-solar-tilt-optimiser-4bd68e62/llms.txt): $0.003/call via x402. 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.
- [Solar Shadow Simulator](https://www.zero.xyz/c/solar-shadow-simulator-e6f38cb4/llms.txt): $0.002/call via x402. Calculates sun position and shadow length for a vertical object at a given location, date, and time interval using the NOAA astronomical method, and reports whether a specified nearby point falls in shadow.
- [Solar Halowerk Inverter Load Check](https://www.zero.xyz/c/solar-halowerk-inverter-load-check-50450dd7/llms.txt): $0.002/call via x402. Calculates continuous load, surge load, and whether an inverter can handle a given set of appliances, returning sizing recommendations and DC current draw.
- [Halowerk Solar Battery Cycle Analyzer](https://www.zero.xyz/c/halowerk-solar-battery-cycle-analyzer-759bb858/llms.txt): $0.004/call via x402. Integrates a time-series of current samples over time using the trapezoidal rule to compute charge/discharge energy for a battery cycle, with gap detection and internal resistance estimation.
- [Halowerk Off-Grid Weather Alarm](https://www.zero.xyz/c/halowerk-off-grid-weather-alarm-fc4a68d7/llms.txt): $0.005/call via x402. Simulates a solar+wind+battery off-grid system over 12–120 hours using DWD MOSMIX_L forecasts and returns a risk alert when renewable coverage drops below a configurable threshold.
- [Victron VE.Direct Log Parser](https://www.zero.xyz/c/victron-ve-direct-log-parser-99e48404/llms.txt): $0.003/call via x402. Parses raw VE.Direct text protocol dumps from Victron solar charge controllers, decoding field values with proper unit scaling and translating numeric state/error codes into human-readable text.
- [Halowerk Solar Clear-Sky Yield Calculator](https://www.zero.xyz/c/halowerk-solar-clear-sky-yield-calculator-1596abd5/llms.txt): $0.003/call via x402. Computes the theoretical maximum daily solar energy yield for a single PV panel under cloudless-sky conditions using astronomical and geometric models, returning hourly/sub-hourly irradiance and integrated energy output.
- [Solar Halowerk Low-Wattage Cooking Energy Calculator](https://www.zero.xyz/c/solar-halowerk-low-wattage-cooking-energy-calculator-8e1db8ab/llms.txt): $0.003/call via x402. Computes thermodynamic heating time estimates for low-wattage cooking appliances given user-supplied device power, food mass, temperatures, specific heat, and efficiency range.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)