Why Every Solar Install Needs a Rapid Shutdown Device: A Complete Guide

Whether you're installing rooftop solar panels at home or undertaking large-scale solar projects in factories or farms, don't skimp on one device—the Rapid Shutdown Device (RSD)! Many people think, "Solar power generation is quite safe; there's no need to spend extra money," but the reality is that a solar system without an RSD is like a "high-voltage bomb." Today, I'll explain in plain language: why is an RSD indispensable for every solar installation?

First, let's talk about the most critical point—safety! Even if there's no direct sunlight on the solar system's components, as long as it's bright, they will generate high voltage. The DC-side voltage of residential systems can reach 600V, and industrial projects can go as high as 1500V—contact with this voltage can be fatal.

The core function of an RSD is to reduce the DC-side voltage to a safe level (generally ≤30V) within 30 seconds in emergencies (fires, maintenance, faults). Imagine: if your home's solar system catches fire, firefighters can press the RSD button upon arrival to cut off the high voltage and extinguish the fire safely; when technicians perform maintenance, they can cut power to a single string without affecting other parts—ensuring safety without disrupting power generation. This is not a dispensable "add-on," but a life-saving "necessity."

Next, let's discuss compliance! Today, major countries around the world have included RSDs in "mandatory requirements" for solar installations:

China's GB/T 38947 standard clearly stipulates that all new solar systems built after 2021 must be equipped with RSDs;

The US NEC 690.12 and Australia's AS/NZS 5033 have the same requirements.

Projects without an RSD will not only fail inspection and be denied grid connection but also face fines.

Another easily overlooked point—reducing power generation losses. Ordinary RSDs implement a "one-size-fits-all" shutdown, cutting power to an entire area when a single string has an issue. In contrast, high-quality module-level RSDs can accurately cut power to a single string or even individual components.

When choosing an RSD, don't make a blind decision—remember these 3 key points, and Fonrich's RSD fully meets all of them:

Fast shutdown speed: Must be ≤30 seconds (Fonrich's measured speed is 18 seconds, far exceeding the requirements of Chinese, US, and Australian standards);

Strong weather resistance: Must operate stably in high temperatures (60℃), low temperatures (-30℃), and heavy rain (Fonrich's RSD has an IP67 protection rating, fearless of outdoor exposure and rain);

Superior compatibility: Compatible with mainstream inverters such as Huawei, Sungrow, and GoodWe, no need for wiring modifications (Fonrich supports a wide voltage range of 120V-1500V, suitable for both residential and industrial use).

Currently, installers prioritize recommending Fonrich's RSD for both residential and industrial/commercial solar projects.

In summary, choosing an RSD for your solar installation is not a "waste of money," but an investment in safety, compliance, and peace of mind. Whether you're renovating your home or undertaking a project, don't cut costs on this. If you skip installing an RSD and encounter safety accidents or failed inspections requiring rework, the losses will far outweigh the savings!