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.