On an average during sunny days 1 kilowatt(kW) of solar panels generate 4 KWH (units) of electricity in a day. 1 kW of solar panels is equal to 3 solar panels each of 330 watts. So we can say one solar panel approximately produces 1.33 units of electricity in a day, 40 units of electricity in a month and 480 units of electricity in a year.