Quick answer: A modern 400W solar panel produces about 1. residential median of 5 peak sun hours. 70. Peak Sun Hours (PSH) is the equivalent number of hours per day when solar irradiance averages 1000 W/m². PSH depends on location and season. In this blog, we will cover how many kWh of energy solar panels produce, energy. A standard residential solar panel, typically rated between 250 to 400 watts, can generate approximately 1 to 2 kilowatt-hours (kWh) of electricity per day under optimal conditions. You live in Texas, and you can use the average yearly 4.