21.2kWh High-voltage PV&ESS Cabinet for Commercial

Product Overview

As a cutting-edge energy solution from Chinese manufacturer YTenergy, the Stackable High-voltage Three-phase PV&ESS All-in-one Cabinet 21.2kWh integrates photovoltaic (PV) energy capture and energy storage system (ESS) functionality into a single, modular unit—designed to address modern energy challenges like grid dependency, rising electricity costs, and the need for sustainable power management.

At its core, this cabinet features a 21.2kWh total energy capacity (with 19.40kWh usable energy) powered by LFP (Lithium Iron Phosphate) batteries—a choice driven by LFP’s superior safety, long lifespan, and resistance to thermal runaway. It operates at a rated voltage of 51.2V and supports three-phase power, making it ideal for scenarios requiring stable, high-power output (e.g., commercial facilities, industrial equipment, or large residential complexes).

What sets this product apart is its stackable design: it uses 5.3kWh high-voltage battery packs that can be configured in 2–4 units to adjust capacity from 10.6kWh to 21.2kWh, adapting to varying energy needs. Additionally, it includes a built-in energy controller (4.0~12.0kW three-phase) that optimizes energy flow—whether from solar panels, the grid, or stored battery power—ensuring minimal waste and maximum efficiency.

Engineered for versatility, the cabinet complies with global standards (e.g., UN38.3, IEC62619, ROHS) and supports seamless integration with existing solar systems, making it a future-proof choice for businesses and homeowners looking to transition to cleaner, more reliable energy.

Product Features

Scalable Energy Capacity for Dynamic Needs

The cabinet’s modular design is a key advantage, built around 5.3kWh individual battery packs that enable flexible capacity adjustment. Users can start with 2 packs (10.6kWh) for smaller loads and expand to 4 packs (21.2kWh) as energy demands grow—no need to replace the entire system. For larger-scale applications (e.g., industrial facilities), up to 4 cabinets can be paralleled, boosting total energy capacity to 84.8kWh (with 77.6kWh usable energy). This scalability eliminates over-investment in unused capacity while ensuring long-term adaptability to changing power needs.

High-Efficiency Power Management

Equipped with a three-phase energy controller (4.0~12.0kW), the cabinet delivers consistent, high-performance power with minimal energy loss. It supports a rated charging/discharging power of 5120W and a rated current of 50A, with a maximum current of 100A for peak-demand scenarios—enough to power heavy-duty equipment like industrial motors or commercial HVAC systems.

To maintain efficiency in diverse environments, the cabinet uses a natural cooling system (no noisy fans) and boasts an IP20 protection rating (dust-tight, protected against finger contact), making it safe for indoor installation (e.g., utility rooms, server closets). It also operates across a wide temperature range: Charge: 0°C ～ +55°C / Discharge: -20°C ~ +60°C—ensuring reliability in cold climates (e.g., northern Europe) and warm regions (e.g., Southeast Asia).

Flexible Installation & Space-Saving Design

Measuring 660*200*1465mm and weighing 140kg, the cabinet features a compact, space-efficient design that fits in tight areas. It supports two installation methods: wall-mounted (for locations with limited floor space, like apartment utility rooms) and floor-stand (for larger areas, like industrial warehouses). This flexibility means it can be installed in diverse settings—from urban high-rises to rural factories—without requiring major renovations.

Seamless Renewable & Grid Integration

Designed for the transition to clean energy, the cabinet integrates seamlessly with solar PV systems via CAN/RS485/RS232 communication ports. The energy controller automatically prioritizes using solar power first, storing excess energy in the battery for later use (e.g., nighttime or cloudy days) and drawing from the grid only when necessary. This reduces reliance on fossil fuel-generated grid power, lowers carbon footprints, and maximizes savings on electricity bills by avoiding peak-hour rate surcharges.

Applications

Commercial & Industrial (C&I) Facilities

Commercial buildings (e.g., office towers, shopping malls) and industrial facilities (e.g., manufacturing plants, warehouses) rely on stable three-phase power to run equipment like elevators, production lines, and HVAC systems. The 21.2kWh PV&ESS cabinet is tailored to these needs: its three-phase design matches industrial power requirements, while the 5120W rated power handles peak loads (e.g., morning/evening operating hours). By storing energy during off-peak hours (when electricity rates are low) and using it during peak hours, businesses can cut energy costs by 20–30%—a significant savings for high-consumption operations.

Large Residential Complexes & Luxury Homes

Multi-family residential buildings (e.g., apartment complexes, gated communities) and large single-family homes often have high energy demands (e.g., multiple HVAC units, electric vehicle chargers, smart home systems). The cabinet’s stackable capacity (10.6~21.2kWh) makes it suitable for shared energy storage: complexes can install a single system to power common areas (e.g., lobbies, gyms) and reduce collective grid dependency. For luxury homes, the cabinet acts as a backup power source during outages, ensuring critical systems (e.g., refrigerators, medical equipment) remain operational—all while integrating with rooftop solar to lower monthly utility bills.

Utility-Scale Solar PV Projects

Small to medium-sized solar projects (e.g., community solar farms, rooftop PV arrays for schools) often face challenges with “curtailment” (wasting excess solar energy when the grid can’t absorb it). The 21.2kWh cabinet solves this by storing surplus solar power during the day, then feeding it back to the grid or local loads (e.g., school classrooms) at night. This increases the “self-consumption rate” of solar energy (from ~30% to 70%+), making solar projects more economically viable and reducing strain on the grid.

Critical Infrastructure Backup

Critical facilities like small hospitals, data centers, and communication towers cannot afford power outages—even short disruptions can lead to financial losses or risks to human life. The Stackable High-voltage PV&ESS Cabinet serves as a reliable backup: its -20°C discharge temperature range ensures it works in cold weather, while the 19.40kWh usable energy provides hours of backup power. The cabinet’s fast-switching capability (automatically activating within seconds of a grid outage) ensures uninterrupted operation for essential equipment like medical monitors, servers, and cell towers.

FAQ

1. What advantages does the high-voltage three-phase design offer compared to single-phase or low-voltage PV&ESS cabinets?

High-voltage three-phase systems are better suited for high-power applications: they deliver more stable power (critical for industrial equipment), reduce current loss (lowering energy waste), and match the three-phase power grids used in most commercial/industrial buildings. In contrast, single-phase cabinets are limited to small residential loads (e.g., household appliances), and low-voltage systems require thicker wiring (increasing installation costs) for the same power output. The 21.2kWh cabinet’s three-phase design makes it a versatile choice for both C&I and large residential use cases.

2. How long does the LFP battery in the cabinet last, and what maintenance is required?

LFP batteries have a long lifespan: they typically support 3,000+ charge-discharge cycles (at 80% depth of discharge), which translates to 8–10 years of use (depending on daily cycling). Maintenance is minimal: users only need to check wiring connections quarterly (to ensure tightness) and keep the cabinet clean (to prevent dust buildup in the cooling system). Unlike lead-acid batteries, LFP batteries do not require water refilling or regular replacement—reducing long-term maintenance costs.

3. Can I connect this cabinet to my existing solar panel system, or do I need additional components?

Yes, the cabinet is compatible with most existing solar systems. It uses CAN/RS485/RS232 communication ports to sync with solar inverters (the only common requirement is that the inverter supports three-phase output, which is standard for commercial/residential systems 5kW+). In most cases, no additional major components are needed—though a professional installer may recommend a small communication adapter (if your inverter uses a non-standard protocol) to ensure seamless integration.

4. What is the maximum number of cabinets I can parallel, and how does this affect performance?

You can parallel up to 4 cabinets, resulting in a total energy capacity of 84.8kWh (with 77.6kWh usable energy) and a combined rated power of 20.48kW (4 x 5120W). Paralleling does not reduce performance: the cabinets’ energy controllers communicate with each other to balance charging/discharging, ensuring even load distribution and preventing overloading of individual units. This makes parallel expansion a simple way to scale energy storage for growing businesses or larger solar projects.

5. Is the cabinet suitable for outdoor installation?

No, the cabinet has an IP20 protection rating, which is designed for indoor use (it is dust-tight but not waterproof). For outdoor applications (e.g., rooftop solar farms), we recommend pairing it with a weatherproof enclosure (rated IP65 or higher) to protect against rain, snow, and extreme temperatures. Alternatively, YTenergy offers outdoor-specific PV&ESS models—contact our support team for details on outdoor-compatible solutions.