The Critical Role of Solar Warning Labels in Photovoltaic System Safety

With the increasing popularity of solar power generation, more and more residential rooftops, commercial and industrial buildings, and large-scale power stations are installing photovoltaic systems. While enjoying clean energy, we must not overlook the potential safety risks that come with it. Among these, there is an unassuming yet crucial “guardian of safety”—the Solar Warning Label.

What is a Solar Warning Label?

A Solar Warning Label is a safety sign specifically designed for photovoltaic systems. It serves to alert installers, maintenance engineers, firefighters, and the general public to the presence of high voltage, arc flashes, and electric shock hazards. It is not only a necessary component of compliant installation but also the first line of defense in protecting personal safety.

Why is a Solar Warning Label Needed?

Many people mistakenly believe that turning off the inverter means the solar system is “de-energized.” However, this is not the case— as long as sunlight hits the photovoltaic panels, the DC side of the circuit will remain energized, even on cloudy days or during power outages.
This “invisible electrification” can easily lead to:
•  High-voltage electric shock accidents
•  Arc burn injuries
•  Obstruction of fire rescue operations
Therefore, posting conspicuous warning labels in key locations can effectively remind relevant personnel to identify dangers, operate in a standardized manner, and prevent accidents.

High-Standard Design, Withstanding the Test of Time and Environment

Solar power systems are typically installed outdoors and are exposed to harsh conditions such as high temperatures, UV radiation, rain, and dust for extended periods. Therefore, a qualified Solar Warning Label must have the following characteristics:
•  Durable material: Made from high-strength polyester or PVC, resistant to tearing and aging
•  Strong environmental adaptability: Waterproof, oil-resistant, and capable of withstanding extreme temperatures (-40℃ to 120℃)
•  Long-lasting clarity: Printed with UV-resistant ink to prevent color fading and text blurring
•  Visually striking: Using high-contrast colors such as yellow, red, and orange, combined with internationally recognized warning symbols (such as lightning symbols and triangle exclamation marks)
These designs ensure that the labels remain clearly readable even after years of outdoor use, truly providing “long-term protection.”

Compliance Requirements: Safety and Responsibility

According to Chinese National Standard GB/T 36963-2018 “DC Arc Fault Protection Device for Photovoltaic Systems” and international standards such as IEC 62109 and NEC (National Electrical Code of the United States), warning signs that meet the standards must be posted at key locations of photovoltaic systems.
Failure to install warning labels as required not only poses safety hazards but can also lead to project non-acceptance, insurance denial, and even legal liability.

Where Should Warning Labels Be Placed?

To maximize their warning effect, it is recommended to affix Solar Warning Labels at the following key locations:
•  On the front of the inverter and at the wiring points
•  At the DC distribution box/fuse box
•  Near the DC circuit breaker or disconnect switch
•  At the entrance to the photovoltaic array or rooftop
•  Next to the emergency shutdown button
The labels should be kept clean and unobstructed, and should be regularly checked for damage or detachment, with timely replacements as needed.

Conclusion

A small warning label may not catch the eye, but it carries a respect for life and a commitment to safety. On the path to promoting green energy development, we must not only pursue “power generation efficiency” but also pay attention to the “safety baseline.”
Choose high-quality, compliant Solar Warning Labels to make safety visible and stop risks at the warning stage.
Safety is no small matter; it starts with a single label.