18KW 48V Three-Phase PowerCore 18K-48

Solar Power Inverters — 18KW Three-Phase 48V Dual AC Output, PowerCore 18K-48

The PowerCore 18K-48 is an 18,000W three-phase off-grid solar inverter system with 28.8kW of maximum PV input capacity, dual AC output ports, and support for up to six units in parallel — making it one of the most capable solar power inverters available for residential and small commercial off-grid installations. The dual AC output design separates main loads from programmable generator output, enabling precise multi-load power distribution across critical and non-critical circuits. Battery-free operation is supported, and integrated WiFi remote monitoring provides full system visibility without additional hardware.

Table of Contents

1. Product Specifications
2. Three-Phase Architecture
3. Dual AC Output and Load Management
4. PV Input and MPPT Performance
5. Solar Energy Inverter Protection Systems
6. Parallel Expansion
7. Frequently Asked Questions

Product Specifications

Three-Phase Architecture

The PowerCore 18K-48 operates on a three-phase 120/208VAC output configuration — the standard for commercial facilities, agricultural operations, and larger residential properties that require balanced three-phase power distribution across heavy equipment, HVAC systems, and high-draw industrial loads. Three-phase solar power inverters at this output level eliminate the load imbalance issues inherent in stacked single-phase systems, delivering cleaner power across all connected circuits simultaneously.

The 48V battery bus operates at industry-standard voltage for systems of this scale, and the self-adapting BMS interface ensures compatibility with the majority of lithium-ion battery management systems without manual parameter configuration. Lead-acid and user-defined battery profiles are also supported for installations with existing battery infrastructure.

Dual AC Output and Load Management

The dual AC output design is one of the defining capabilities of this solar energy inverter platform. The main AC output handles primary residential or commercial loads, while the programmable GEN output port can be configured as a dedicated generator interface or as a secondary load output for non-critical circuits. This separation enables:

• Critical Load Isolation: Essential systems such as medical equipment, refrigeration, and communications remain powered on the main output during generator or grid priority switching.
• Non-Critical Load Shedding: Secondary loads on the GEN output can be disconnected automatically when battery state of charge drops below a configured threshold.
• Generator Integration: A connected generator can be configured to start automatically and feed the GEN output when solar and battery resources are insufficient, without impacting the main load circuit.

PV Input and MPPT Performance

With dual MPPT trackers each capable of accepting 14.4kW of PV input — totalling 28.8kW of maximum array capacity — the PowerCore 18K-48 is sized for installations well beyond the 18kW inverter output rating. This oversizing ratio allows the system to maintain near-rated output during partial shading, seasonal irradiance variation, and cloudy-day conditions when peak irradiance is unavailable.

Each MPPT tracker accepts up to 36A of input current with an operating voltage range of 120–550VDC and a maximum open-circuit voltage of 600VDC. These parameters support large-format high-voltage panel strings — including 450W and 550W monocrystalline and bifacial N-Type panels — without requiring string-level voltage limiting or additional DC combiners for most standard array configurations.

Solar Energy Inverter Protection Systems

As a professional-grade solar energy inverter, the PowerCore 18K-48 includes a comprehensive suite of electrical protection features covering all major fault conditions:

• Over-Voltage Protection: PV and battery inputs monitored continuously with automatic disconnection on over-voltage events.
• Over-Current Protection: 360A maximum charge and discharge current rating with hardware-level current limiting on all input paths.
• Over-Temperature Protection: Intelligent air cooling adjusts fan speed in response to internal temperature, with automatic output derating above 113°F to protect core components.
• Short-Circuit Protection: All AC output ports include short-circuit protection with automatic recovery sequencing.
• Reverse Polarity Protection: Battery input protected against reverse polarity connection during installation and maintenance.

Parallel Expansion

Up to six PowerCore 18K-48 units can be connected in parallel, scaling total three-phase output from 18kW to 108kW without replacing the core inverter hardware. This modular expansion approach is particularly valuable for inverters for sale in growing commercial and agricultural applications where load requirements increase incrementally over time rather than all at once.

Each additional unit added to the parallel array contributes its full 18kW of rated output and 28.8kW of PV input capacity — enabling phased system growth that matches capital expenditure to actual load demand at each stage of the installation’s development.

Browse our full Off-Grid Solar Inverters, Three-Phase Solar Systems, and Solar Power Inverters collections for additional specifications and compatible components.

Frequently Asked Questions

Q: What is the PowerCore 18K-48 rated output? The PowerCore 18K-48 delivers 18,000W of continuous three-phase output at 120/208VAC, with peak power at twice the rated output sustained for 10 seconds. Maximum AC output is 19,800VA with a rated output current of 50A per phase.

Q: What solar power inverters parallel capacity does this unit support? Up to six units can be connected in parallel, scaling total system output from 18kW to 108kW. Each unit contributes its full rated output to the parallel array, and all units share the communication bus through RS485, CAN, or dry contact interfaces.

Q: What battery types are compatible? The PowerCore 18K-48 supports lithium-ion batteries with self-adapting BMS communication, lead-acid batteries in 3-stage or equalization charging mode, and user-defined battery profiles for custom battery chemistries. Rated battery voltage is 48VDC with an operating range of 40–60VDC.

Q: Does the system support battery-free operation? Yes. The PowerCore 18K-48 operates in battery-free mode, drawing exclusively from PV input to power loads when solar generation is sufficient — without requiring a battery bank to be present in the system.

Q: What communication interfaces are included? Embedded interfaces include RS485, CAN, USB, and dry contact ports. WiFi and GPRS modules are available as optional external add-ons for remote monitoring and data logging through the SunGoldPower monitoring platform.