The Complete Guide to the ATESS HPS100-US-220D 100kW Hybrid Inverter With Integrated Transformer

At the heart of every commercial solar-plus-storage system sits a single piece of equipment that determines whether the entire investment succeeds or fails: the hybrid inverter. The ATESS HPS100-US-220D is a 100kW, three-phase, all-in-one hybrid inverter purpose-built for the American market, with a 220V Delta output configuration and an integrated isolation transformer that eliminates the need for external step-up or step-down hardware. This isn't a universal inverter with a voltage setting changed in software; it's a purpose-engineered product for U.S. commercial and industrial energy systems.

This comprehensive guide covers everything you need to evaluate this inverter for your next project: ATESS's track record, technical specifications, scalability up to 800kW, programmable working modes, safety and compliance features, installation considerations, ideal applications, and the financial case for commercial solar-plus-storage.

Who Is ATESS, and Why Should You Trust Their Equipment?

Before evaluating any piece of hardware at this scale, it's worth understanding the manufacturer standing behind it. ATESS Power Technology Co., Ltd. was founded in 2017 as a subsidiary of the Growatt Group, one of the world's most recognized names in solar inverter technology. Headquartered in Shenzhen, China, ATESS operates from the GROWATT-ATESS Industrial Park, a purpose-built facility spanning over 31,600 square meters with 25,000 square meters dedicated to advanced manufacturing.

The HPS series is the flagship line within ATESS's commercial hybrid inverter family, designed specifically for medium-to-large C&I applications and earning a reputation for reliability, flexibility, and seamless grid integration. The HPS100-US-220D variant takes all of that established engineering and adapts it specifically for American electrical standards and requirements.

What Exactly Is the ATESS HPS100-US-220D?

The model designation tells the story: HPS100 refers to the 100kW power rating within the HPS platform, US indicates it's built to American specifications, 220 denotes the output voltage class, and the D suffix signifies the Delta winding configuration of the integrated transformer.

What sets this unit apart from many competing products is its truly all-in-one design. The HPS100-US-220D integrates four critical components into a single enclosure:

For installers, this dramatically simplifies design and wiring. For building owners, it means fewer points of failure and a single vendor for support. The integrated transformer is particularly significant for U.S. deployments, many commercial buildings use 120/208V or 277/480V distribution with Delta configuration as a standard wiring topology. By including the transformer internally, ATESS eliminates external hardware that would otherwise add cost, complexity, and physical footprint.

Key Technical Specifications & Performance

Power Output & Efficiency

The inverter delivers a rated output of 100kW with an apparent power rating of 110kVA across three phases, suitable for large commercial loads. ATESS reports conversion efficiency up to 97.6%, meaning very little energy is lost during DC-to-AC conversion. For a commercial facility consuming hundreds of kWh per day, even a single percentage point of improved efficiency translates to thousands of dollars in savings over the system lifetime.

Solar PV Input

The HPS100-US-220D supports a maximum PV input of 110kWp with an MPPT voltage range of 480V to 800V DC. The unit features dual MPPT channels, each operating independently, allowing two separate solar strings with different orientations or tilt angles to run at their optimal power points simultaneously. This flexibility is especially valuable on complex commercial rooftops where shading or structural constraints prevent uniform panel orientation.

Battery Integration

Battery compatibility is defined by a voltage range of 400V to 600V DC. The system supports high-power charging and discharging for rapid response to load changes and utility signals. The inverter communicates with compatible battery management systems via RS485 and CAN bus protocols, ensuring coordinated and safe operation. This voltage range provides meaningful flexibility in selecting battery modules and configuring storage to match budget and performance requirements.

Seamless Transfer & Backup

One of the most critical performance metrics for any hybrid inverter is transfer time between grid-tied and off-grid modes. The HPS100-US-220D achieves this switchover in ≤10 milliseconds. Most electronic equipment won't even register a 10ms interruption, making this inverter suitable for backing up sensitive loads such as data centers, medical equipment, telecommunications infrastructure, and manufacturing control systems.

Scalability: Growing With Your Business (Up to 800kW)

Perhaps the most forward-looking feature of the HPS100-US-220D is its ability to scale. The HPS platform supports paralleling of up to 8 units, meaning a single-inverter 100kW system can grow to 800kW without replacing the original equipment.

This is achieved through a hot-backup parallel architecture: if one inverter in a parallel configuration experiences a fault, the remaining units seamlessly assume the load. There is no single point of failure and no downtime.

Programmable Working Modes: Intelligence Built In

The HPS100-US-220D isn't a passive piece of equipment. It's an intelligent energy management platform that can be programmed to operate in multiple modes depending on your facility's priorities and utility rate structure.

Physical Design & Installation Considerations

The HPS100-US-220D is housed in a Type 1 enclosure measuring approximately 1200mm × 1900mm × 800mm and weighing around 923 kg. While substantial, this is compact relative to what it replaces, without the integrated transformer, a comparable installation would require a separate inverter cabinet, standalone isolation transformer, additional wiring, and dedicated floor space for each component. The all-in-one design consolidates everything into a single footprint.

The front-panel touchscreen LCD simplifies parameter setting, system monitoring, and maintenance, technicians can view real-time performance data, adjust operating modes, and diagnose issues directly without a separate laptop or monitoring device. For remote monitoring, the inverter communicates via RS485 and CAN bus and integrates into broader building management or SCADA systems.

Ideal Applications & Use Cases

The 100kW hybrid architecture, seamless backup, and parallel scalability to 800kW make the HPS100-US-220D suitable for a wide range of commercial and industrial deployments.

Why a U.S.-Specific Model Matters

The American electrical market has unique requirements that differ significantly from European, Asian, or African standards. Voltage levels, frequency specifications, wiring topologies, safety certifications, and interconnection standards all vary by country, and sometimes by state. A hybrid inverter that performs flawlessly in a European 400V/50Hz environment may be entirely unsuitable for a U.S. 208V or 480V/60Hz installation without significant modification.

The Financial Case for the HPS100-US-220D

Energy decisions at commercial scale are ultimately financial decisions. The HPS100-US-220D makes a strong economic argument through multiple compounding savings channels.

Safety, Protection & Compliance

The HPS100-US-220D incorporates comprehensive protection features designed to safeguard both the equipment and the facility it serves.

Why Buy From Portlandia Electric Supply?

Portlandia Electric Supply is an authorized distributor of ATESS products in the United States, every unit sold comes with full manufacturer warranty backing and technical support. We offer more than just equipment: our team provides product guidance, system design consultation, and ongoing support to ensure your energy investment delivers the returns you expect.

Related Products

ATESS Delta US standard 220V 100KW hybrid inverter (included tranformer) - ATESS HPS100-US-220D

View

ATESS Wye US standard 220V 100KW hybrid inverter (included tranformer) - ATESS HPS100-US-220Y

View

Ready to Power Your Facility With the HPS100-US-220D?

Whether you're quoting a single 100kW inverter for a standalone project or specifying a multi-unit parallel system for a large commercial campus, our team is equipped to help you configure the right solution.

Quote My System Schedule a Consultation

Frequently Asked Questions