SunSniffer adds rapid shutdown function to solar module-level monitoring system


Rapid shutdown function integrated into module-level monitoring system. Image: SunSniffer

SunSniffer is to launch its first junction boxes with the special monitoring sensor and a rapid shutdown function for solar modules.


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In 2017, a revised version of the US National Electrical Code (“NEC 2017”) comes into effect, which then requires module-level rapid shutdown. SunSpec Alliance reacted on that and drafted specifications for the communication signal supporting module-level rapid shutdown (Communication Signal for Rapid Shutdown, SunSpec Interoperability Specification).


SunSniffer developed a sensor that not only provides a unique module-level monitoring system, including module-level temperature measurement, analysis via artificial intelligence and a simulation engine, but additionally is able to rapidly shut the system down according to the requirements of NEC 2017. LEONI and QC Solar together with SunSniffer developed the respective junction boxes with the embedded sensor.


PV module junction box sensor for US rapid shutdown.


The SunSniffer sensor measures voltage and temperature at each single module, and the simulation engine in combination with artificial intelligence allowsthe system to detect even the smallest error – with accuracy of under 1%, according to the company. The SunSniffer system not only detects errors, it analyses and identifies them, provides detailed instructions to operators in what, where and how to be repaired or swapped, and ensures complete documentation.


Market release will be December, 2016.

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