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Which power line communication options are implemented in different solar installations?

Figure 1 shows typical power line communication options implemented in different solar installations. These installations can be divided into communication on DC lines (red) and communication on AC lines (blue).

Why is wired communication important for Solar System monitoring & safety?

With the increased number of solar installations, importance of system monitoring and safety rises. In this trend, wired communications play a key role. Safety standards like SunSpec® Rapid Shutdown (RSD) which support NEC 2014, NEC2017 and UL1741 module-level rapid shutdown are built on wired communication interface.

What is power line communication?

A notable use case is in grid applications, where devices exchange necessary data using power cables as transmission lines, thus the term Power Line Communication. Data transmission is facilitated by modulating signals at higher frequency bands, typically in the kHz and MHz ranges, onto the power line.

What frequency bands are used for power line communication?

International standards and norms specify the frequency bands which can be used for power line communication. In general, there are two categories, narrowband - and broadband - PLC. Narrowband PLC uses carrier frequencies up to 500 kHz. Table 1 shows the available frequency bands for different regions.