Know what your
panels will produce

Accurate solar forecasts, auto-calibration that learns your system, smart notifications, and home screen widgets. All in one app.

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Features

Built for solar owners

Everything you need to understand and optimize your PV installation, designed to be simple and actionable.

Solar Forecasting

Hourly and daily PV production forecasts based on your system specs, location, and real weather data. Know exactly what to expect.

Auto-Calibration

Log your actual production and the forecast learns your system over time. The more data, the more precise the predictions become.

Smart Notifications

Get alerted when tomorrow's forecast changes significantly or when it's the best time to run heavy appliances. Never miss a sunny window.

Home Screen Widgets

Glanceable widgets for Android showing today's forecast, tomorrow's outlook, and a 4-day overview — without opening the app.

How it works

Up and running in minutes

No complicated setup. Just tell Volcast about your system and start forecasting.

1

Describe your system

Enter your panel capacity, orientation, tilt angle, and location. That's all we need.

2

Get your forecast

Volcast combines weather data with your system model to predict hourly and daily production.

3

Calibrate & optimize

Log actual production, and the model auto-calibrates. Set up notifications and widgets to stay ahead.

Preview

Designed for clarity

A dark, focused interface that puts your energy data front and center.

Dashboard
Forecast
Widgets

FAQ

Common questions

Volcast uses high-resolution weather data combined with your specific system parameters. After calibration with real production data, accuracy typically reaches 85-95% on clear and partly cloudy days. Heavy cloud cover is harder to predict for any system, but Volcast still outperforms generic weather apps.
No. Volcast works with any solar installation. You just enter your panel specs and location. For enhanced features like live production data, we integrate with GoodWe/SEMS Portal inverters — more integrations are coming.
Volcast offers a free tier with 2-day forecasts. Premium unlocks the full 7-day forecast, auto-calibration, production history, and more — as a one-time purchase, no subscription.
Volcast will launch on both Android and iOS. Home screen widgets are available on Android at launch, with iOS widgets planned for a future update.
You log your actual daily production (just one number). After 5+ data points, Volcast compares your real output against historical weather conditions to fine-tune the solar model parameters specific to your installation — accounting for shading, panel degradation, and local factors.