UL Solutions Debuts Testing & Certification Framework for Safer Plug-In Solar Across the United States - CleanTechnica

UL Solutions has introduced a dedicated testing and certification program, UL 3700, specifically for plug-in solar systems—also known as balcony solar—in the United States. This program establishes clear construction, performance, and labeling criteria tailored to these systems, which connect to household circuits via a plug rather than permanent wiring like traditional rooftop solar panels. By addressing safety risks such as system overloads and unintended power backflow, UL 3700 provides manufacturers with a reliable framework to design safer products and supports safer installations for consumers, particularly those in multi-unit buildings or renters unable to install rooftop solar. The launch of UL 3700 aims to facilitate broader adoption of plug-in solar by mitigating safety concerns and regulatory uncertainties. This comes amid growing interest and emerging state-level legislation permitting plug-in solar systems, with Utah recently allowing up to 1.2 kW systems without utility approval and several other states considering similar measures. UL Solutions emphasizes that the certification program not only enhances consumer confidence but also complements larger solar installations,