Certification program for plug-in solar systems launches in the U.S.

UL Solutions recently launched a dedicated testing and certification program for plug-in solar systems.

The program aims to create a “clear safety framework” to support the installation of plug-in solar systems, also known as “balcony solar,” across the United States. It is based on UL 3700, the Outline of Investigation for Interactive Plug-In Photovoltaic Equipment and Systems.

Plug-in solar systems are used outside the U.S. and differ from permanently wired rooftop solar panels because they are intended to connect to household circuits through a plug and receptacle. That simplicity makes solar easier to adopt, but it also brings certain risks, such as systems becoming overloaded, and raises the possibility of power flowing back into lines.

In addition to defining safety standards for manufacturers, UL 3700 addresses risks by requiring features that mitigate accidental contact with hazardous electric parts, promote safe installation, protect against overloads, and prevent electric current from flowing in the wrong direction.

Plug-in solar systems certified to UL 3700 could be suitable for renters and homeowners who are unable to install rooftop systems and could be used to provide back-up power for essential devices during outages.