A 20KW Solar System is capable of producing around 2300 – 2400 units of electricity in one month and around to 76 to 80 kWh of electricity in a day. A 20kW Solar system is usually paired with 55 to 60 Solar panels (depending on the wattage of the Solar panels offered; you only need 55 of the 370w Solar panels to get 20kW) and either a 15kW or 20kW inverter. You can expect to pay around $17,150 for a 20kW system installed. Prices can vary wildly depending on the quality of panels you install and the company that quotes the job. 20KW solar power system is great for small scale business and organizations. On grid system can generate 80 units/day or 2400 units/month as an average over the year. It requires 100 square meter + shadow gap area for installation.