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.
They specifically delved into what's known as payback: how many years of operation does it take for a solar panel to generate as much energy as was used in its manufacture? They found that depending on the technology used, it takes between one and four years for solar panels to earn out on their energy debt.