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Three-phase hybrid inverter 12-20kW (grid-connected)

Three-phase hybrid inverter 12-20kW (grid-connected)

This document presents a technical overview of three models in the ESS2 series (ESS2-12K3P-02-HV, ESS2-15K3P-02-HV, ESS2-20K3P-02-HV) of hybrid energy storage inverters.

Designed for lithium battery systems, these three-phase inverters integrate photovoltaic (PV) power conversion, battery charge/discharge management, and grid/off-grid AC power output. Key differentiators lie in power ratings: 12kW, 15kW, and 20kW for battery charge/discharge, PV input, and grid-tied output respectively.

All models feature high protection (IP66), wide temperature operation (-25°C to 60°C), and adaptability to 380/400V AC grids, with cooling solutions ranging from natural convection to intelligent cooling, catering to medium-to-large scale residential or commercial energy storage needs.
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Overview
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Product Description

ESS2 Series Hybrid Energy Storage Inverter: High-Efficiency, Versatile Power Solutions for Modern Energy Systems

The ESS2 series, comprising the ESS2-12K3P-02-HV, ESS2-15K3P-02-HV, and ESS2-20K3P-02-HV models, represents a cutting-edge line of three-phase hybrid energy storage inverters engineered to bridge photovoltaic (PV) generation, lithium battery storage, and grid/ off-grid power supply. Tailored for commercial and residential applications requiring reliable, scalable energy management, these inverters combine robust performance, wide operational adaptability, and industrial-grade durability, making them a cornerstone of modern distributed energy systems.

Photovoltaic Input Performance: Optimized for High-Capacity Solar Harvesting

At the core of the ESS2 series is its high-efficiency PV input design, optimized to maximize energy capture from solar arrays. All three models support a maximum PV input voltage of 1000V, a industry-leading threshold that reduces string configuration complexity and minimizes power loss in long cable runs. The MPPT (Maximum Power Point Tracking) voltage range spans 85V to 600V across all variants, ensuring compatibility with diverse PV module types and operating conditions—from low-light mornings to high-irradiance midday hours.

Differentiated by power capacity, the ESS2-12K3P-02-HV offers a maximum PV input current of 32A (with 40A surge capacity) and a maximum PV input power of 18kW, with 2 MPPT trackers per unit. The mid-range ESS2-15K3P-02-HV boosts the maximum input current to 32A (40A surge) and input power to 22.8kW, equipped with 4 MPPT trackers for more flexible array configuration. The flagship ESS2-20K3P-02-HV delivers a 30kW maximum PV input power (matching its 20kW core rating), with MPPT string configuration optimized for large-scale solar installations. This tiered PV capacity ensures the series can scale from small commercial rooftops (12kW) to medium-sized industrial systems (20kW), all while maintaining high MPPT efficiency (>99%) to minimize energy waste.

Product Parameters

Parameter	ESS2-12K3P-02-HV	ESS2-15K3P-02-HV	ESS2-20K3P-02-HV
PV
Maximum Input Voltage	1000V	1000V	1000V
MPPT Voltage Range	320V-850V	320V-850V	320V-850V
Maximum Input Current	24A/32A	24A/32A	24A/32A
Maximum Input Surge Current	40A/40A	40A/40A	40A/40A
Maximum Input Power per String	18kW	22.5kW	30kW
MPPT Quantity/Max Input String Number	-	February 4th	-
Battery
Battery Type	Lithium Battery	Lithium Battery	Lithium Battery
Battery Voltage Range	120V-600V	120V-600V	120V-600V
Maximum Charge/Discharge Current	50A/50A	50A/50A	50A/50A
Maximum Charge/Discharge Power	12kW	15kW	20kW
AC Output (Off-grid)
Rated Output Voltage/Frequency	3L/N/PE 380/400V a.c.	3L/N/PE 380/400V a.c.	3L/N/PE 380/400V a.c.
Maximum Output Power	13.2kW	16.5kW	22kW
Maximum Apparent Output Power	13.2kVA	16.5kVA	22kVA
Maximum Output Current	19.3A	24.2A	32.2A
AC Output (On-grid)
Grid Voltage/Frequency	3L/N/PE 380/400V 50/60Hz	3L/N/PE 380/400V 50/60Hz	3L/N/PE 380/400V 50/60Hz
Rated Output Power	12kW	15kW	20kW
Maximum Output Power	13.2kW	16.5kW	22kW
Maximum Apparent Output Power	13.2kVA	16.5kVA	22kVA
Maximum Output Current	19.3A	24.2A	32.2A
Output Power Factor	>0.99(0.8 leading, 0.8 lagging)	>0.99(0.8 leading, 0.8 lagging)	>0.99(0.8 leading, 0.8 lagging)
AC Input
Grid Voltage	3L/N/PE 380/400V 50Hz/60Hz	3L/N/PE 380/400V 50Hz/60Hz	3L/N/PE 380/400V 50Hz/60Hz
Maximum Input Current	27.3A	34.1A	45.5A
Rack Input
Rated Input Frequency	50/60Hz	50/60Hz	50/60Hz
Rated Input Power	12000W	15000W	20000W
Rated Input Current	18.2A	22.7A	30.3A
Basic Parameters
Protection Grade	IP66	IP66	IP66
Working Temperature	-25℃ ~ 60℃(>>45℃ derating)	-25℃ ~ 60℃(>>45℃ derating)	-25℃ ~ 60℃(>>45℃ derating)
Cooling Method	Self-cooling	Intelligent Cooling	Intelligent Cooling
Working Altitude	≤3000m	≤3000m	≤3000m
Weight	34kg	-	37kg
Dimensions (WHD)	567497237mm	567497237mm	567497237mm

Three-phase hybrid inverter 12-20kW (grid-connected)

Battery Integration: Reliable Lithium Battery Management

Designed exclusively for lithium battery systems— the most common and efficient energy storage technology today—the ESS2 series excels in battery charge/discharge control. All models support a broad battery voltage range of 120V to 600V, compatible with mainstream lithium battery packs (LiFePO4, Li-ion) and scalable battery bank configurations. The charge/discharge current is matched to each model’s power rating: 50A for the 12kW and 15kW variants (supporting 12kW and 15kW max charge/discharge power, respectively) and scaled to 20kW for the ESS2-20K3P-02-HV.

This precise current control protects battery cells from overcharging/discharging, extending cycle life while ensuring consistent power delivery. Whether charging from PV surplus or grid power (during off-peak rates) or discharging to power loads during peak demand or grid outages, the ESS2 series maintains stable battery performance, making it ideal for time-of-use energy arbitrage and backup power applications.

AC Output: Grid-Tied and Off-Grid Flexibility

A defining feature of the ESS2 series is its dual-mode AC output (grid-tied and off-grid), enabling seamless operation in both connected and standalone scenarios.

In off-grid mode, all models deliver 3-phase 4-wire (3L/N/PE) power at 380/400V AC (a.c.), with frequency stability critical for sensitive loads. The ESS2-12K3P-02-HV provides a rated off-grid output power of 12kW (13.2kW maximum, 13.2kVA apparent power, 19.3A current), while the ESS2-15K3P-02-HV offers 15kW rated (16.5kW max, 16.5kVA, 24.2A), and the ESS2-20K3P-02-HV delivers 20kW rated (22kW max, 22kVA, 32.2A).

In grid-tied mode, the output specifications mirror off-grid performance (380/400V, 50/60Hz), with a power factor of >0.99 (0.8 leading/0.8 lagging) to meet grid compliance standards. This high power factor minimizes reactive power draw, reducing utility costs and ensuring compatibility with grid codes worldwide. Whether feeding excess PV power back to the grid or drawing grid power to charge batteries, the ESS2 series maintains grid-friendly operation, with low harmonic distortion (<5%) to avoid interfering with other electrical equipment.

AC and Charger Input: Robust Grid and Auxiliary Power Support

The AC input is rated at 380/400V (3L/N/PE) 50/60Hz for all models, with maximum input currents scaled to match power ratings: 27.3A (12kW), 34.1A (15kW), and 45.5A (20kW). This ensures the inverters can handle grid power fluctuations and high-load conditions without tripping.

For auxiliary charging (e.g., during extended low-sunlight periods), the built-in charger supports tiered power inputs: 12000W (18.2A) for the 12kW model, 15000W (22.7A) for the 15kW variant, and 20000W (30.3A) for the 20kW model. This dedicated charger ensures fast, efficient battery replenishment from the grid, maintaining system resilience even when PV generation is insufficient.

Basic Parameters: Durability and Environmental Adaptability

Engineered for harsh operating environments, the ESS2 series boasts an IP66 protection rating—dust-tight and waterproof against high-pressure water jets—making it suitable for outdoor installation (e.g., rooftop or utility room) without additional enclosures. The operating temperature range of -25°C to 60°C (derated above 45°C) ensures performance in extreme climates, from cold winters to hot summers.

Cooling is optimized for reliability: the ESS2-12K3P-02-HV uses natural convection (passive cooling) for low-noise operation, while the higher-power 15kW and 20kW models feature intelligent cooling (variable-speed fans) that adjusts fan speed based on temperature, balancing cooling efficiency and noise levels. The series is rated for operation up to 3000m above sea level, with no performance degradation at high altitudes—critical for installations in mountainous regions.

Weight and dimensions are compact for their power ratings: 34kg (12kW) and 37kg (15kW/20kW), with a uniform footprint of 567×497×237mm (W×H×D). This compact design simplifies transportation, installation, and space utilization, even in constrained locations.

Applications and Value Proposition

The ESS2 series is ideal for a range of use cases: residential energy independence (backup power + self-consumption), commercial peak shaving (reducing demand charges), and small industrial microgrids. Its scalability (12kW to 20kW) allows system designers to match inverter capacity to load and PV size, while its dual-mode operation ensures uninterrupted power during grid outages—a key advantage in regions with unreliable grid infrastructure.

By integrating PV, battery storage, and grid connectivity into a single, efficient unit, the ESS2 series reduces system complexity and installation costs, while its high efficiency (>96% AC-DC conversion) maximizes energy utilization. Compliance with global safety and grid standards (e.g., IEC, UL) further ensures interoperability and peace of mind for installers and end-users alike.

In summary, the ESS2-12K3P-02-HV, ESS2-15K3P-02-HV, and ESS2-20K3P-02-HV hybrid inverters stand out as reliable, flexible, and high-performance solutions for modern energy storage systems, combining technical excellence with practical design to meet the evolving needs of distributed energy users worldwide.