Hoymiles Launches First UL 3700-Compliant Plug-In Microinverter
AI-generated image · US National Wire
The introduction of a safety-standardized 'balcony solar' system opens energy production to renters and apartment dwellers.
Hoymiles has released the HiFlow Pro microinverter, marking the first time a plug-in solar product in the U.S. conforms to the national UL 3700 safety standards, according to Engadget.
Adopted in December 2025, the UL 3700 standard addresses critical safety risks associated with plug-in photovoltaic energy systems, often called "balcony solar." As reported by Engadget, a primary concern with these systems is the risk of electricity being drawn into the grid during power outages, which could endanger utility crews. The UL 3700 standard establishes features to prevent these accidental overloads.
While Engadget notes that these systems cannot power an entire apartment, they allow users to draw solar power through standard household outlets, reducing reliance on the electric grid. This technology is particularly significant for renters and apartment dwellers who are unable to install full rooftop photovoltaic arrays.
According to reporting from Electrek cited by Engadget, while microinverters themselves are not new, the HiFlow Pro is notable for its compliance with these inaugural North American safety standards. The adoption of this technology is currently supported by laws in several states, with other states proposing similar measures.