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50kW100kWh integrated solar-plus-storage off-grid system

ESSI-50kW/100kWh Solar-ESS Off-Grid All-in-One CabinetThis integrated solution combines a lithium iron phosphate battery pack, bidirectional inverter, MPPT charge controller, and intelligent management system in a single, rugged IP54 enclosure.

It delivers 50kW of continuous AC power and 100kWh of energy storage, designed for reliable off-grid and backup power applications in commercial, industrial, and remote settings.

Key features include seamless grid switching, 100% unbalanced three-phase load support, AI-powered remote monitoring, and fire protection, ensuring safe, efficient, and low-maintenance operation.
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Overview
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Product Description

ESSI-50kW/100kWh Solar Energy Storage Off-Grid All-in-One Cabinet: Redefining Reliable Off-Grid Power

In an era where energy resilience and sustainability are non-negotiable, the ESSI-50kW/100kWh Solar Energy Storage Off-Grid All-in-One Cabinet emerges as a transformative solution for businesses, industrial facilities, and remote communities seeking to break free from grid dependency. Engineered as a fully integrated system, this cabinet combines a high-density lithium iron phosphate (LiFePO₄) battery bank, a bidirectional grid-tie inverter, advanced MPPT solar charge controllers, and an intelligent energy management system (EMS) into a single, compact enclosure. This design eliminates the complexity of separate component installation, delivering a turnkey power solution that balances performance, safety, and scalability.

Core Power & Storage Capabilities

At the heart of the ESSI-50kW/100kWh lies a robust 100kWh LiFePO₄ battery pack, built with automotive-grade LFP 32650 cells for exceptional cycle life (≥8000 cycles to 80% depth of discharge) and thermal stability. The battery supports a maximum charge current of 200A and a maximum discharge current of 280A, ensuring rapid energy transfer to meet high-demand loads. Paired with a 50kW bidirectional inverter, the system provides a continuous AC output of 50kW (with 100kW peak power capability) and a PV input capacity of 100kW, enabling it to harness and store solar energy efficiently while supplying uninterrupted power to critical loads. Whether powering a remote mining site, a commercial facility during grid outages, or a microgrid in an off-grid village, this system delivers consistent, high-quality power.

Three-Phase Flexibility & Unbalanced Load Support

Unlike many off-grid systems that struggle with three-phase load distribution, the ESSI-50kW/100kWh is purpose-built to handle 100% unbalanced three-phase loads. This capability is critical for industrial and commercial applications where equipment may draw uneven power across phases, such as manufacturing lines, HVAC systems, and data centers. The system’s advanced inverter topology ensures voltage and frequency stability even under dynamic load conditions, preventing equipment damage and ensuring operational continuity. With a wide voltage input range of 300VAC–440VAC and support for 50/60Hz frequencies, it adapts seamlessly to global power standards, making it a versatile choice for international deployments.

Smart Energy Management & Remote Monitoring

Powered by an AI-driven EMS, the ESSI-50kW/100kWh offers end-to-end visibility and control over energy flows. The system automatically prioritizes solar energy utilization, charging the battery during peak sunlight hours and discharging it to power loads during periods of low irradiance or grid outages. For applications with grid access, the integrated STS (Static Transfer Switch) enables seamless switching between grid and off-grid modes in ≤20ms, eliminating downtime for sensitive electronics. Remote monitoring and control are accessible via a cloud-based platform, allowing users to track real-time energy production, battery state of charge (SoC), and system health from any internet-connected device. The platform also provides predictive maintenance alerts, ensuring potential issues are addressed before they escalate, and reducing long-term operational costs.

Product Parameters

ESSI-50kW/100kWh
DC Parameters
Battery Type	LFP 32650
Battery Pack Capacity & Configuration	14.336kWh/1P4S/16S
Battery Capacity/Number of Packs	100kWh/Optional 1P4S/8
Battery Voltage Range	314V-403V
Max Charging Current	200A
Max Discharging Current	280A
Cycle Life	>8000
DC/DC Module Parameters
Rated Power	1600W
Voltage Range/Minimum Voltage	150V-1000V
Rated Current	160A
Max Current	50A
DC PV Parameters
Max Input Power	100kW
Max Input Current	160A
Max Open Circuit Voltage/Per String Voltage	1000V
Input Switch	250A/1000VAC/2P
AC Side Parameters (Grid-connected)
Rated Output Power	50kW
Max Apparent Power	55kW
Rated Current	75A
Current Distortion Rate	<2%
System Voltage Standard	3W+N+PE
Voltage Range	300VAC-440VAC
Frequency Range	45-55Hz/55-65Hz
Power Factor	1
AC Side Parameters (Off-grid)
Rated Output Power	50kW
Max Apparent Output Power	55kW
Max Peak Output Power	30kW
Rated Output Frequency	50/60Hz
Voltage Distortion Rate/THDu	<3%
Voltage Stability	1%/10% load for 10 minutes
Grid/Off-grid Switching & Switch Configuration
Bypass Static Switch	125A/400vac
Load Switch	125A/400vac
Grid Switch	250A/400vac
Switching Time	STS≤20ms
System Parameters
Max Efficiency	>96%
Operating Temperature	-30-55℃ (Derating use when exceeding 40℃)
Relative Humidity	0-95%RH No condensation
Dimensions (L×W×H)	1050×1000×2030mm
Protection Grade	IP54
Noise	<70dB
Communication Method	4G/WIFI/RS485/TCP/IP
Fire Protection	Aerosol
Display	LCD Touch Screen

Safety & Reliability: Built for Harsh Environments

Safety is embedded in every layer of the ESSI-50kW/100kWh design. The LiFePO₄ battery pack features a multi-level protection system, including overcharge/over-discharge protection, short-circuit prevention, and thermal runaway mitigation. The cabinet’s IP54-rated enclosure provides dust and water resistance, making it suitable for both indoor and outdoor installations, while its operating temperature range of -30°C to 55°C ensures performance in extreme climates. Additional safety features include arc fault detection, active fire suppression, and a gas discharge system, providing comprehensive protection against electrical and thermal hazards. These safeguards, combined with a 10-year design lifespan, make the system a reliable investment for mission-critical applications.

Scalability & Future-Proof Design

Designed with scalability in mind, the ESSI-50kW/100kWh supports parallel connection of up to 6 units, enabling users to expand their energy storage capacity to 600kWh and power output to 300kW as their needs grow. The modular architecture also allows for easy upgrades to the EMS or inverter components, ensuring the system remains compatible with emerging technologies such as virtual power plants (VPPs) and demand-response programs. With its all-in-one design, the cabinet reduces installation time by up to 70% compared to traditional component-based systems, minimizing labor costs and project timelines.

In a world where energy security is increasingly uncertain, the ESSI-50kW/100kWh Solar Energy Storage Off-Grid All-in-One Cabinet stands as a beacon of reliability and innovation. It empowers businesses and communities to take control of their energy future, reduce carbon footprints, and achieve true energy independence—without compromising on performance or safety. Whether you’re looking to eliminate grid dependency, reduce peak energy costs, or ensure backup power for critical operations, this system delivers the flexibility, efficiency, and peace of mind you need to thrive in any environment.