When you want to retrieve data from a database, you ask for the data by using Structured Query Language, or SQL. SQL is a computer language that closely resembles English, but that database programs understand. Every query that you run uses SQL behind the scenes.
The inverter turns the DC electricity generated by the solar panels into 120-volt AC that can be put to immediate use by connecting the inverter directly to a dedicated circuit breaker in the electrical panel.
Divide this number with the cost of the system. You are now left with how much you are paying for every kWh of electricity the solar panels produce ($/kWh). Divide again by hundred to get cents/kWh. Electricity prices in the United States typically range from 8 to 17 cents/kWh.