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.
Total photovoltaic installations this year are expected to be 10.8 gigawatts, after surging 72 percent to 12.4 gigawatts in 2016, according to Bloomberg New Energy Finance. The number of solar jobs will increase by 10 percent in 2017, Luecke said. The median wage for a solar installation job was $26 an hour last year, according to the report. The jobs census defines solar workers as those who spend at least half their time on solar-related work. Solar workers will be busy over the next four years. According to New Energy Finance, the installed base of solar capacity will climb to 105 gigawatts by 2021, up from about 38 gigawatts today.