In the news release, Hoymiles Introduces HiFlow Pro, the First UL 3700-Compliant Plug-in Microinverter in the US to Boost DIY Solar, issued 15-Jul-2026 by Hoymiles Power Electronics Inc. over PR Newswire, we are advised by the company that the image shall be changed. The complete, corrected release follows:
Hoymiles Introduces HiFlow Pro, the First UL 3700-Compliant Plug-in Microinverter in the US to Boost DIY Solar
RICHARDSON, Texas, July 15, 2026 /PRNewswire/ -- Hoymiles announced the official release of its HiFlow Pro plug-in microinverter, the first DIY solar microinverter compliant with the UL 3700 standard that is developed specifically for plug-in photovoltaic (PIPV) systems. Designed for plug-and-play residential solar applications, HiFlow Pro maximizes energy yield and optimizes performance within limited installation spaces, such as balconies and compact rooftops.
Building on years of dedicated expertise in the European plug-in energy sector, Hoymiles is bringing more accessible solar solutions to homeowners across the US.
A New Era for Plug-in Solar in the US
Plug-in solar systems have gained popularity in Europe by making solar energy accessible for homeowners and renters. As demand for similar solutions grows in the US, the market has highlighted the need for a dedicated safety framework beyond traditional rooftop PV.
In response, UL 3700 was introduced—the first North American safety standard specifically designed for plug-in photovoltaic systems. It provides manufacturers with a clear certification pathway while offering utilities, authorities having jurisdiction (AHJs), and consumers a consistent benchmark for safe deployment.
Hoymiles is leading this transition by introducing the first UL 3700-compliant plug-in solar microinverter to the US.
HiFlow Pro Microinverter: Easy, Accessible and Efficient DIY Solar Solution
HiFlow Pro is optimized for residential plug-in PV applications to ensure maximum energy harvest.
What sets Hoymiles HiFlow Pro apart:
- High energy yield enabled by industry-leading MPPT efficiency (99.8% static and 99.5% dynamic) and low-voltage operation, maximizing energy harvest under changing weather conditions.
- Plug-and-play setup and commissioning via Bluetooth and Wi-Fi in less than 60 seconds, simplifying installation and system setup.
- Type 6 enclosure rating with reliable operation from -40°C to +65°C; Backed by 250,000-hour reliability testing, it delivers dependable performance across diverse climates.
- It supports parallel operation of four microinverters installed in separate sockets, enabling flexible expansion up to 1200 W total output power to satisfy different market needs and local regulations.
Driving the Future of Distributed Energy
"By introducing the first UL 3700-compliant plug-in microinverter in the US, we're not only launching a new product—we're helping establish a new benchmark for residential solar that combines simplicity, safety, and high performance," said Hoymiles CEO Dr. Yang Bo.
As residential energy needs evolve in the US, Hoymiles remains committed to making solar more accessible and empowering more households with reliable clean energy solutions.
Learn more at https://www.hoymiles.com/us/hiflowpro.html
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/C O R R E C T I O N -- Hoymiles Power Electronics Inc./
Hoymiles Introduces HiFlow Pro, the First UL 3700-Compliant Plug-in Microinverter in the US to Boost DIY Solar
Huawei FusionSolar's new Smart String Grid-Forming ESS Platform, LUTERRA, is born from technology breakthroughs designed to drive customer success.
MUNICH, July 15, 2026 /PRNewswire/ -- Huawei launched LUTERRA at Intersolar Europe in Germany last month. In this article, Steve Zheng, President of Smart ESS Business, Huawei Digital Power explains how Huawei has achieved industry-leading efficiency in an easy-to-install battery storage solution that delivers plant level grid-forming (GFM) applications.
Huawei's grid-forming technology has already been proven in field operation, including the world's largest 100% renewable energy microgrid, at The Red Sea resort destination in Saudi Arabia. The Red Sea project has been in stable operation for over two years, demonstrating that multi-site coordination of GFM energy resources is entirely possible at the gigawatt-hour scale.
While not many projects will be as large as the 400MW of solar PV and the 1.3GWh battery energy storage systems (BESS) deployed in Saudi Arabia, Huawei's technology can deliver increased revenues, higher throughput and seamless integration with solar for all customers.
Features such as its industry-leading round-trip efficiency (RTE), high-precision state of charge (SOC) control and cell-to-pack optimisation are achieved across multiple disciplines, Zheng says, "including electrochemistry, electrical engineering, electronics, thermodynamics, control technology, and prediction technology."
"Huawei's comprehensive control over the overall solution achieves 93.1% efficiency on the low-voltage side of the PCS at 25°C ambient temperature, with the SOC precision reaching 2.5% at both ends and 3% in the plateau," Zheng says.
The integrated design covers full cell-to-pack thermal management, liquid-cooling systems and high-voltage silicon carbide (SiC) switching architecture. The setup offers unique performance advantages for long-duration energy storage (LDES) applications over other products on the market.
"We adhere to the string architecture and adopt an optimiser for each pack and a controller for each rack. These refined and effective management methods address electrochemical inconsistency, especially inconsistency in the battery lifecycle," Zheng explains.
"In our next-generation solution, the AC voltage is increased to 1000 V AC for the first time based on SiC components. This reduces system loss and improves efficiency. Our unique, intelligent, distributed cooling technology increases the heat dissipation area. In addition, high RTE, high consistency, high SOC level, and high availability are improving the solution's throughput by more than 10% compared with conventional solutions."
While the technology is sophisticated, installation and logistics are designed to be as simple as possible, according to Steve Zheng. In the example of a 1GWh BESS plant, LUTERRA Smart String Grid-Forming ESS Platform reduces delivery time by at least 30%, balance of plant (BOP) costs by at least 20%, and the footprint by 1 square metre for every megawatt-hour installed, compared to conventional solutions.
Zheng says these results are achieved with Huawei's patented through-busbar Architecture, which enables flexible installation, capacity expansion, and adaptive C-rates for charging and discharging throughout the project's lifecycle.
Grid-forming for stable inverter-based electricity grid
As regular readers of Energy-Storage.news will be aware, grid-forming technologies and their associated applications have grown hugely in importance for enhancing the stability of electricity grid across the world.
Historically, grid frequency and voltage have been established as byproducts of the rotating mass of thermal generation turbines. As these largely fossil-fuel-based assets are replaced or outnumbered by variable renewable energy (VRE) sources, a new challenge arises in maintaining system stability.
Fortunately, inverters equipped with GFM capabilities can provide the same inertia, short-circuit ratio (SCR) and other essential functions such as black start capability. GFM is a perfect fit for BESS and countries and regions including the UK, Australia and China are actively deploying grid-forming resources.
Within Europe, Germany's four transmission system operators (TSOs) launched a long-term inertia service market earlier this year, for which GFM BESS assets are eligible, while the European association of TSOs across 36 countries, ENTSO-E, has drafted technical guidelines for grid-forming requirements.
"Grid-forming technology is key to maintaining the stability of a power grid that integrates a high proportion of renewable energy. The technology has evolved from individual equipment to arrays and power plants," Steve Zheng says.
Huawei has defined six grid-forming capabilities: inertia, short-circuit Level, Primary frequency regulation, Power oscillation damping, black start and on/off-grid switching in virtual synchronous generator (VSG) mode.
"We believe that the breakthrough of grid-forming technology at the plant level is critical," Zheng says.
In the example of a 100MW BESS plant, there will be thousands of power electronics devices that must run in GFM mode.
"It is technically challenging to ensure that these devices work together to stabilise the power grid through the collaboration of hardware and software," Zheng says, referring to the example of The Red Sea project.
Huawei's technology has also been used in large-scale grid-forming projects in other countries, including Germany, Bulgaria, the Philippines and China.
Huawei's product roadmap strategy focuses on array and system-level optimisation
The company has developed the industry's largest GFM energy storage solution, optimised for BOP at the system level. The strategy behind that product roadmap choice was to focus not just on the power and energy density of a single BESS container, but on the power and energy density of a full array or power plant.
"Only when the array solution is optimal can the entire plant be optimal. A single container is not a true energy storage system; cells alone do not make an energy storage system," Zheng says.
"Therefore, we consider each array as the basic unit in our solution design and planning, rather than blindly pursuing higher power density of a single container."
The Smart String Grid-Forming ESS Platform's design features a Dual stage 1000Vac high-voltage platform. This grid-forming storage system can resolve critical front-of-the-meter (FTM) operational challenges across utility renewable plants and C&I storage deployments, even as power systems impose increasingly stringent grid-support requirements on energy storage assets.
"When it comes to architecture, we believe that the dual-stage solution offers superior grid safety compared to the conventional single-stage solution," Steve Zheng tells us.
First, under high-voltage ride-through (HVRT) conditions, inrush current will flow back and forth between the power grid and the PCS. Especially when the battery SOC is low, this may cause battery insulation failure or even severe safety issues.
Second, during low-voltage ride-through (LVRT), a certain constant active power is required to help the power grid recover quickly. These advantages are not available in the single-stage architecture."
** This press release is distributed by PR Newswire through automated distribution system, for which the client assumes full responsibility. **
The technology breakthroughs behind Huawei's next-generation Smart String Grid-Forming ESS Platform
The technology breakthroughs behind Huawei's next-generation Smart String Grid-Forming ESS Platform
