---
title: "The US’s first UL 3700 balcony solar microinverter is here"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/293252773.md"
description: "Hoymiles launched the HiFlow Pro, the first US microinverter certified to UL 3700, North America's new safety standard for plug-in balcony solar. This technology offers a cost-effective alternative to rooftop systems and is gaining traction as more US states, including eight with signed legislation by July 2026, legalize plug-in solar."
datetime: "2026-07-20T20:38:08.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/293252773.md)
  - [en](https://longbridge.com/en/news/293252773.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/293252773.md)
generator: "portal-rs"
---

# The US’s first UL 3700 balcony solar microinverter is here

HiFlow Pro. Photo: Hoymiles

Hoymiles has launched the HiFlow Pro, the first US microinverter certified to meet UL 3700, North America’s new safety standard for plug-in balcony solar.

Plug-in balcony solar gives homeowners and renters a smaller, less expensive alternative to a conventional rooftop system. The setup typically consists of one or more portable solar panels connected to a microinverter, which is then plugged into a normal electrical outlet.

Balcony solar is already hugely popular in Europe, particularly in Germany. Now, a growing number of US states are clearing a legal path for the technology.

As of July 2026, eight states – Utah, Maine, Virginia, Maryland, Colorado, Connecticut, Vermont, and New Hampshire – have signed plug-in solar legislation into law. New York’s legislature has also passed a balcony solar bill, but it was still awaiting the governor’s signature as of July 16. Nearly 30 states have introduced plug-in solar legislation in total.

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> **Disclaimer: This article is for reference only and does not constitute any investment advice.**