Maximize your solar investment with Volcast – the ultimate PV production forecast tool.

Stop guessing when the sun will power your home. Volcast provides an accurate, hour-by-hour solar production forecast for your PV system, covering today and the next 7 days. Designed by solar owners for solar owners, Volcast helps you align your energy-heavy tasks with peak production windows to maximize self-consumption and slash your electricity bills.

🛠 WHY TRUST VOLCAST?
Built by Experts: Created by engineers and solar enthusiasts who understand the real-world challenges of energy management.

Community-Driven: Features like Home Assistant integration were built to meet the needs of the advanced smart-home community.

Scientific Rigor: Unlike simple weather apps, we use a high-fidelity physics engine combined with real-time satellite irradiance data.

⚡ SMART HOME & HOME ASSISTANT INTEGRATION
Volcast features a professional REST API for Home Assistant users. Export your forecast data directly to your HA dashboards to automate your heat pump, EV charger, or boiler precisely when your panels reach peak efficiency.

🔬 THE SCIENCE OF ACCURACY
Our advanced engine accounts for the unique geometry of your installation:

Multi-String Support: Perfect for complex east-west or multi-roof configurations.

Bifacial Panels: Specialized modeling for modern high-efficiency modules.

AI Auto-Calibration: Log your actual production and our Kalman-filter-based AI will fine-tune the model to your system's real-world performance.

Horizon Profiling: We calculate shading from local hills and surrounding obstacles.

📅 KEY FEATURES:
7-Day Precise Forecast: Hour-by-hour solar power prediction.

Hourly View Toggle: Switch each hour between forecast, actual production, and the difference at a tap.

Multi-Device Sync: Your production history and calibration stay in sync across every device you sign in on.

Notification Center: Get evening alerts for tomorrow's peak, morning snow warnings, and peak window reminders.

Privacy First: Calibration data is securely processed to improve accuracy, but we never use ads or third-party tracking.

💎 PLANS & PRICING
Free: 2-day forecast and full setup so you can try Volcast on your own system.
Premium (monthly or yearly): 7-day forecast, AI auto-calibration, Home Assistant API access, and production alerts. Start with a 7-day free trial.
Lifetime: One-time purchase, no renewals – available for a limited time.

❓ FREQUENTLY ASKED QUESTIONS (FAQ)
How accurate is the forecast? We combine satellite data with your specific tilt/azimuth. Accuracy improves significantly after a few days of AI calibration.

What is Calibration? By logging your daily production, you help the AI adjust for local factors like shading or panel degradation.

Does it work with any inverter? Yes, Volcast is independent of your hardware. You only need to know your system's parameters.