Module-Level RSD: How Fonrich Thailand's MLPE Solutions Enhance Solar Safety

While Thailand boasts abundant solar resources, its PV regulations are equally stringent. Conventional string-level RSD (Rapid Shutdown Devices) are no longer sufficient—component-level RSD has become the new standard. Fonrich Thailand’s MLPE (Module-Level Power Electronics) solution is built around this trend, taking PV safety to an entirely new level. Today, we’ll explore the advantages of component-level RSD and how Fonrich delivers on this promise.

I. Is Component-Level RSD Safer Than String-Level RSD? A World of Difference!

Many assume string-level RSD is enough, but the safety gap between the two is substantial. String-level RSD shuts down an entire string, while component-level RSD can isolate a single panel—the difference in safety is critical:

• String-level RSD’s Limitation: When triggered, it shuts down the entire string. However, adjacent panels in other strings still carry high voltage, posing significant electric shock risks for technicians working nearby.

• Component-Level RSD’s Advantage: It only cuts power to the faulty panel. Immediately after shutdown, the voltage of all other panels drops to below 30V (Thailand’s safety threshold), allowing technicians to handle repairs without anxiety.

The stakes are even higher during emergencies: Thailand’s summers bring heavy rains and typhoons. If a rooftop PV system catches fire, component-level RSD can cut power to each individual panel in an instant. Firefighters don’t need to wait for entire strings to power down—they can approach and extinguish the fire immediately, minimizing damage.

II. Fonrich Thailand’s MLPE Solution: Dual Protection (Component-Level RSD + Arc Detection)

Fonrich’s MLPE solution isn’t just about "rapid shutdown"—it integrates arc fault protection as well, addressing two of Thailand’s most pressing PV safety concerns in one package:

1. Precise Component-Level Shutdown: Isolate Faulty Panels, No Disruption to Others

Fonrich’s MLPE products (e.g., smart optimizers, dedicated RSD modules) feature "one-panel-one-shutdown" functionality. Whether a panel malfunctions or requires maintenance, triggering the shutdown only cuts power to that specific panel—all other panels continue generating electricity normally. This balances safety with minimal downtime.

Even more convenient: The Fonrich SafeSolar platform provides precise fault localization. Technicians don’t need to climb onto rooftops and inspect panels one by one. For example, the app might display, "Panel 8 on the east rooftop triggered RSD"—technicians can head straight to the faulty panel, saving time and reducing their exposure to rooftop hazards.

2. Arc Detection + Rapid Shutdown: Cut Power at the First Spark

Thailand’s hot, humid summers accelerate wire aging and connector loosening—major causes of arc faults and subsequent fires. Fonrich’s MLPE solution monitors for arcs in real time: the moment an arc is detected, it triggers component-level RSD, cutting power to the affected panel in 0.05 seconds (faster than a human blink). There’s no chance for the arc to ignite a fire.

III. Fonrich’s MLPE Solution: Tailored to Thailand’s "Unique Safety Challenges"

Beyond core RSD and arc protection, Fonrich’s solution includes practical upgrades designed for Thailand’s specific conditions—making it truly "localized":

1. Withstands Thailand’s Harsh Weather: Resistant to High Heat and Heavy Rain

• Rooftop temperatures in Thailand can reach 60℃ in summer, and the rainy season brings relentless downpours—conditions that easily damage low-quality RSD devices.

• Fonrich’s MLPE products have an IP68 protection rating, meaning they can withstand short-term submersion in water. Their housings are made of UV-resistant materials to prevent aging under intense sunlight—ensuring long-term reliability.

2. Versatile for All Scenarios: Rooftops, Ground-Mounts, and BIPV

Whether it’s a small residential rooftop system, a large industrial ground-mounted plant, or a BIPV (Building-Integrated Photovoltaics) curtain wall, Fonrich’s component-level RSD fits seamlessly. For example:A shopping mall in Bangkok uses BIPV, with PV panels embedded in glass curtain walls—wiring is highly concealed. Fonrich’s RSD modules can be installed directly behind the panels, requiring no major modifications. This not only meets safety regulations but also preserves the building’s aesthetic.

Conclusion: Component-Level RSD Is the Future of PV Safety in Thailand

As Thailand’s PV market grows—with more rooftop systems and BIPV projects—safety remains the top priority. Conventional string-level RSD can no longer meet the country’s strict standards, making component-level RSD the inevitable trend.

Fonrich Thailand’s MLPE solution stands out by offering:

• Precise component-level shutdown (isolating faulty panels without disrupting others),

• Integrated arc protection (stopping fires before they start),

• Weather resilience (built for Thailand’s heat and rain),

• Versatility (adapting to rooftops, BIPV, and industrial plants).

To top it off, Fonrich provides reliable after-sales support. For homeowners and maintenance teams alike, this solution delivers peace of mind. After all, PV systems are long-term investments—without safety, even high electricity earnings are meaningless. Isn’t that right?