A solar inverter is a critical component of a solar energy system. It is responsible for converting direct current (DC) energy generated by solar panels into alternating current (AC) electricity that can be used to power homes, businesses, and other electrical devices.
Almost any solar systems of any scale include an inverter of some type to allow the power to be used on site for AC-powered appliances or on the grid. Different types of inverters are shown in Figure 11.1 as examples. The available inverter models are now very efficient (over 95% power conversion efficiency), reliable, and economical.
Always follow the manufacturer’s instructions, but the standard procedure is “AC on, then DC on.” First, turn on the AC breaker feeding the inverter to power its internal controls and allow it to sync with the grid. Then, close the DC disconnect to send power from the solar panels. Reversing this can stress or damage the inverter.
Grid Connection: Some solar inverter circuit diagrams also include a grid connection, which allows for the excess AC power generated by the solar panels to be fed back into the grid, potentially earning the system owner credits or reducing their electricity bill.
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