VOLCAST
Predict solar production with physics
No inverter login. No API keys. Just your panel parameters and satellite weather data. Works from day one — no historical data needed.
What sets Volcast apart
Physics from day one
No training data, no waiting period. The laws of physics work immediately.
Auto-calibration
Kalman filter learns your roof over time. Every day the forecast gets sharper.
No hardware access needed
No inverter login, no manufacturer API keys. Works purely from your panel parameters and weather data.
Real-time nowcasting
For users with hourly logging (via HA or other integrations). Live comparison of forecast vs. actual as the day unfolds.
The Engine
Not a black-box ML model. A full physical simulation of how sunlight becomes electricity on your specific roof.
Four inputs. Location, tilt angle, compass direction, rated power. That's it.
Self-Learning
Log your actual daily production — just one number. After 5+ data points the Kalman filter fine-tunes the model to your specific installation. Accounts for shading, panel degradation, and local factors. All processing on your phone, not in the cloud.
Home Assistant users get even more: automatic hourly logging means faster calibration and unlocks real-time nowcasting — comparing forecast vs. actual production as the day unfolds.
Home Assistant
Official HACS integration with full Energy Dashboard support. Install in 3 clicks, get live sensors and production alerts — no YAML editing required.
HACS Integration
Install in 3 clicks, automatic updates
Energy Dashboard
Feeds directly into HA energy tracking
Live Sensors
Power output and energy for today/tomorrow
Production Alerts
Get notified at peak production times
REST API
Build custom automations with your API key (Premium)
Always with you
Home screen widgets for today's forecast, tomorrow's outlook, and multi-day overview. Proactive alerts when the forecast changes significantly or when it's the best time to run heavy appliances.
