Imax Power’s AC Side of Photovoltaic-Storage Hybrid Grid-Connected/Off-Grid Integrated Cabinet: The Core Hub of Intelligent Energy Management

In the thriving era of distributed energy and microgrids, the photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet has emerged as a “smart bridge” connecting photovoltaic systems, energy storage, and loads. Imax Power, leveraging its profound technological expertise, has introduced an AC-side solution for its photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet. Supported by core modules such as MPPT, STS, EMS, and circuit breakers, this solution constructs an efficient, secure, and flexible energy management system, providing reliable support for scenarios like industrial and commercial energy storage, emergency backup power, and off-grid power supply.

I. Technical Principles: Multi-Module Synergy to Build an Energy Conversion and Scheduling Hub

The AC side of Imax Power’s photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet is crucial for achieving “photovoltaic-storage collaboration” and seamless “grid-connected to off-grid” switching. Each core module performs its unique functions, collectively managing energy conversion, scheduling, and protection:

1. MPPT (Maximum Power Point Tracking)

As the “intelligent brain” of the photovoltaic system, the MPPT module continuously monitors the voltage and current of photovoltaic strings. It dynamically adjusts the operating point to ensure that photovoltaic panels always output at maximum power. Imax Power adopts a multi-channel independent MPPT design, enabling it to adapt to photovoltaic arrays with different orientations and shading conditions, thereby enhancing power generation efficiency. For instance, in distributed rooftop photovoltaic projects, four parallel MPPT channels can flexibly handle complex lighting scenarios, preventing power losses caused by local shadows.

2. STS (Static Transfer Switch)

The STS is the core component for achieving seamless switching between grid-connected and off-grid modes. Its switching time is ≤8ms, significantly shorter than the international standard requirement of 200ms. In the event of grid failures or intentional off-grid operations, the STS can instantly switch the load to energy storage or photovoltaic power supply, ensuring the continuous operation of critical equipment such as data centers and medical devices. Imax Power’s STS module supports three-phase five-wire systems and can accommodate unbalanced loads, making it suitable for complex power consumption scenarios in industrial parks and commercial complexes.

3. EMS (Energy Management System)

The EMS serves as the “decision-making center” of the system, implementing closed-loop management through “monitoring-decision-making-control-optimization” to achieve coordinated operation among photovoltaic systems, energy storage, the grid, and loads. Based on peak-valley electricity prices, photovoltaic power generation forecasts, and user power consumption habits, it formulates energy storage charging and discharging strategies (e.g., charging during valley periods and discharging during peak periods) to reduce electricity costs. Simultaneously, it continuously monitors battery status (voltage, current, temperature, SOC) and triggers protection mechanisms against overcharging, over-discharging, and overcurrent to prevent equipment damage or safety risks.

4. Circuit Breakers

As the “safety guardians” of the system, circuit breakers rapidly cut off the circuit in case of abnormal currents (such as short circuits or overloads), preventing equipment damage or fire risks. Imax Power employs a high-frequency isolation architecture combined with intelligent tripping principles. Through the dynamic balance between coil magnetic fields and currents, it achieves millisecond-level protection responses, ensuring the safe and stable operation of the AC side.

II. Product Features: High Efficiency, Safety, and Flexibility to Meet Diverse Needs

Imax Power’s AC-side solution for the photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet adopts an “ALL-in-One” design philosophy. It highly integrates modules such as battery packs (including BMS), photovoltaic controllers, PCS, STS, EMS, power distribution, air conditioning, and fire protection, enabling standardized delivery and plug-and-play functionality. Its core advantages include:

• High-Efficiency Conversion: The PCS module utilizes SiC power devices with an efficiency exceeding 99%. It supports an ultra-wide DC voltage range of 600-1000V, compatible with 314Ah large-capacity cells, reducing energy losses and enhancing system economic efficiency.
• Reliable Safety: With an IP54 protection rating, it is dustproof and waterproof. The high-frequency isolation architecture prevents circulating currents on the battery side, reducing overheating risks. It also supports early fault cell positioning and early warning, establishing a three-dimensional protection system for equipment, assets, and personnel.
• Flexible Capacity Expansion: The modular design supports parallel connection of multiple units, with power ratings expandable up to the MW level. This meets the requirements of various scenarios such as industrial and commercial peak-valley套利 (arbitrage), microgrid backup power, and photovoltaic power output smoothing.
• Intelligent Management: It supports local or remote access, enabling real-time monitoring of energy flow status through a cloud platform. This facilitates fault预警 (early warning), remote diagnosis, and streamlined operation and maintenance processes.

III. Application Scenarios: Covering All Fields to Empower Green Energy Transition

Imax Power’s AC-side solution for the photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet has been widely applied in the following scenarios due to its outstanding performance:

• Industrial and Commercial Energy Storage: In factories and shopping malls, it reduces electricity costs through peak-valley arbitrage while serving as a backup power source to ensure production continuity.
• Microgrids: In remote areas or islands, it constructs independent microgrids, achieving collaborative power supply from multiple energy sources such as photovoltaics, energy storage, and diesel generators, enhancing energy self-sufficiency.
• Emergency Backup Power: In critical load scenarios like data centers and hospitals, the STS module enables seamless switching during grid failures, ensuring uninterrupted power supply.
• Photovoltaic-Storage-Charging Integration: In charging stations and parking lots, it combines photovoltaic power generation with energy storage systems to provide green charging services for electric vehicles while smoothing grid loads.

Conclusion

Imax Power’s AC-side solution for the photovoltaic-storage hybrid grid-connected/off-grid integrated cabinet is driven by technological innovation and oriented towards user needs. Through the collaborative work of core modules such as MPPT, STS, EMS, and circuit breakers, it constructs an efficient, safe, and flexible energy management system. Whether for industrial and commercial energy storage, microgrids, emergency backup power, or photovoltaic-storage-charging integration, Imax Power can provide customized solutions, contributing to the global energy transition and creating a green future.