Stop Exporting Solar.
Start Saving.

The most impactful thing you can do is increase your self-consumption rate: the percentage of solar energy you use in your home rather than exporting to the grid. Most households sit at 25-35% self-consumption without trying. By shifting flexible loads like washing machines, dryers, dishwashers, pool pumps, and EV chargers into the solar window, you can push this to 60-80%. That's the difference between saving a few dollars a week and saving several hundred dollars a year. OnSun makes this easy by giving you a 7-day production forecast and recommending the best times to schedule each appliance based on your specific system and local weather.

The textbook answer is 10am to 3pm, and on a clear summer day that's broadly right. But the real answer changes every day. Cloud cover, season, panel orientation, and even shading from nearby trees all affect when your panels produce the most energy. A partly cloudy day might have a narrow 2-hour window of strong production, while a clear winter day might peak earlier or later than summer. OnSun uses detailed weather and solar irradiance data for your exact location to predict your production curve each day. Instead of guessing, you get a specific recommendation like "Run your washing machine at 11am Wednesday" to help you hit the solar window.

Solar forecasting combines several data sources to predict how much electricity your panels will produce. It starts with weather forecasts (cloud cover, temperature, and humidity), then factors in your panel specifications (size, tilt, orientation) and your geographic location to calculate expected solar irradiance. OnSun uses forecasting models that predict output at 15-minute to 1-hour intervals depending on your location. The result is a personalised production curve for each day of the coming week, so you can plan your energy usage around the sun rather than guessing.

Yes. OnSun works with any grid-connected solar PV system regardless of brand, inverter type, or panel size. You don't need any special hardware or monitoring equipment. Just enter your system details (panel capacity, roof orientation, and tilt angle) and OnSun forecasts your expected production using national weather-model data and a physics-based solar model calibrated to your exact location. It works in Australia, the United States, the United Kingdom, Europe, and anywhere in the world where solar panels are installed. A 3kW system on a townhouse or a 15kW array on a large home both run through the same forecasting engine.

Yes. OnSun is free to download, and the free version includes a 3-day solar forecast and up to two appliances, which is enough to see how much good timing changes your savings. An optional OnSun Pro subscription unlocks the full 7-day forecast and unlimited appliances. There's no hardware to buy and nothing to wire up. Enter your system details and you're set up in about a minute.