Life & fun · September 3, 2026
Rooftop Solar Forecaster
Use more of your own solar generation!
Rooftop Solar Forecaster launched on September 3, 2026 with 1 votes, #3,899 of 8,093 launches that month.
What it does
Solar owners use only about 40% of the power their panels produce. The other 60% is sold to the grid and bought back later, costing a typical home $600 - $1,000 a year. OnSun is built to help you use more of the solar you generate. We forecast what your roof will make for the week ahead, help you line up the EV charger, washing, dishwasher and pool pump with the sunniest hours, and remind you when to run each.
Free solar forecast app for iPhone and Android. See how much your panels will make, and when, through each day this week, and when to run each appliance.
OnSun is a free solar forecast app for iPhone and Android that predicts how much your rooftop panels will produce, and when, through each day of the week ahead, and shows the best time to run each appliance. There is no hardware to install. Enter your panel size, roof direction, tilt and location. The 3-day forecast is free; OnSun Pro unlocks the full week. The average household exports 50 to 70% of its solar production back to the grid for as little as 4 to 8 cents per kilowatt-hour, then buys that same energy back at night for 25 to 40 cents. Shifting your washing machine, dishwasher, or EV charger into the solar window doesn't require new hardware. It just requires knowing when to press…from onsun.app
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