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.
Solar Panels. The solar panels themselves usually account for about 30% of total costs. Residential solar panels with a combined capacity of 3-8kW typically cost between $4,000-$16,000. The best solar panels are not necessarily the most expensive. Cost per watt ($/W) is a more convenient way of looking at the costs of solar panels. This metric indicates costs relative to electrical power output.