Turn tomorrow's sunlight
into today's decisions
Data-driven solar forecasts
for smarter living
Data-driven solar forecasts
for smarter living
Seeing solar power become more accessible is what excites me most. I built Suncastic to answer a simple question I had myself: how much energy will my panels actually produce this week?
Suncastic combines real-time weather with a PV setup to deliver clear, hour-by-hour estimates — and I’m grateful to make it available to everyone for free.
Philip, Founder of Suncastic
Know when your panels will produce the most power and schedule high-consumption tasks accordingly.
Pair forecast data with battery storage to minimize grid dependence.
Daily summary cards show total yield, peak power, cloud cover, and weather conditions.
Set your inverter’s max AC power so estimates reflect real-world curtailment.
Enter past meter readings and Suncastic adjusts future estimates to match your site.
Type a city, address, or use your device’s GPS. Try it now
Set your panel capacity (kWp), orientation, tilt, and inverter — or just use the defaults.
View hour-by-hour solar irradiance, cloud cover, weather conditions, and estimated PV output for up to 7 days.
Suncastic uses Open-Meteo weather data including cloud cover, irradiance, and temperature. Forecasts are generally reliable for planning within a 3–5 day window, though accuracy depends on your region’s weather model coverage.
It predicts how much electricity your solar panels will produce (in kWh) based on weather, system size, panel orientation, and tilt angle.
No. You can view a forecast for any location without an account. Signing in lets you save plant configurations, view multi-day forecasts, and use advanced features.
Yes. Hourly production estimates help you decide when to charge batteries, run appliances, or export to the grid.