APsystems APstorage ELS-11.4 PCS – 11.4kW AC-Coupled Battery Inverter & Power Conversion System

MPN: ELS-11.4

Pair with: APsystems APstorage 10.24kWh Lithium Battery LiFePO4 – APbattery-51.2V/10.24kWh-U

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Transform Existing Solar into a Smart Energy Storage System

• 11.4kW continuous power output
• 17.1kW peak backup capability
• AC-coupled design for existing solar systems
• UPS-level backup switching (<10ms)
• Generator-ready integration
• 120/240V split-phase output
• Compatible with multiple low-voltage battery brands
• Intelligent energy management modes
• IP65 outdoor-rated enclosure
• 95.6% maximum efficiency
• Ethernet, CAN, and RS485 communications
• UL1741SB and IEEE1547 compliant
• 10-year warranty

The APsystems APstorage ELS-11.4 PCS (Power Conversion System) is a powerful AC-coupled battery inverter designed to add whole-home energy storage, backup power, and intelligent energy management to both new and existing residential solar installations. Delivering up to 11.4kW continuous output power and 17.1kW peak backup power, the ELS-11.4 serves as the heart of an APstorage energy storage system, connecting low-voltage batteries to your home's electrical system while intelligently managing energy flows.

Unlike traditional hybrid inverters that require replacing existing solar equipment, the ELS-11.4 utilizes an AC-coupled architecture, making it an ideal upgrade path for homeowners who already have grid-tied solar and want to add battery storage and backup capabilities.

Why Choose the APsystems ELS-11.4?

Add Storage to Existing Solar Systems

The ELS-11.4 is designed specifically for AC-coupled applications, allowing homeowners to add battery storage without replacing existing solar inverters.

Ideal for:

• Existing grid-tied solar systems
• New solar + storage installations
• Whole-home backup systems
• Energy arbitrage and time-of-use optimization
• Self-consumption optimization
• Generator-integrated backup systems

Powerful 11.4kW Output

The ELS-11.4 delivers enough power to support significant household loads during normal operation and outages.

• Continuous Output Power: 11.4kW
• Peak Backup Output: 17.1kW
• Maximum Output Current: 47.5A
• Split-Phase 120/240V Output

This level of output allows the system to support larger household loads, HVAC equipment, well pumps, appliances, and critical circuits during grid outages.

Whole-Home Backup Power

When utility power fails, the ELS-11.4 automatically transitions to backup operation with UPS-level switching speeds under 10 milliseconds, helping protect sensitive electronics and maintain uninterrupted power to critical loads.

Key backup features include:

• 17.1kVA surge capability
• Fast transfer time (<10ms)
• Split-phase backup output
• Unbalanced load support
• Generator integration capability

Intelligent Energy Management

The APstorage platform provides multiple operating modes to help homeowners maximize energy savings and energy independence.

Available operating modes include:

• Backup Power Supply
• Self-Consumption
• Peak & Valley Time Shifting
• Peak Shaving

These intelligent operating modes allow homeowners to optimize battery usage based on utility rates, solar production, and backup priorities.

Compatible with Multiple Battery Brands

The ELS-11.4 supports low-voltage battery systems and automatically adapts charging strategies through battery communication protocols, offering flexibility when designing energy storage systems.

Battery Specifications:

• Battery Voltage Range: 40-60VDC
• Maximum Continuous Charge Current: 240A
• Maximum Continuous Discharge Current: 240A
• Automatic BMS Communication

Generator Ready

The ELS-11.4 includes dedicated generator integration capabilities and dry-contact controls, allowing seamless integration with standby generators for extended backup runtime during prolonged outages.

Features include:

• Dedicated generator input
• Dry contact controls
• Automatic energy management
• Generator support during extended outages

Built for Indoor or Outdoor Installation

The ELS-11.4 is engineered for demanding residential environments.

• IP65 Rated Enclosure
• Smart Active Cooling
• Operating Temperatures from -13°F to 149°F
• Outdoor or Indoor Installation

Monitoring & Communications

Monitor system performance and energy usage through APsystems' intelligent monitoring platform.

Communication options include:

• Ethernet
• RS485
• CAN

The integrated APsystems EMA platform provides real-time system visibility and intelligent operation management.

Product Specifications

Perfect Pairing for APstorage Battery Systems

The ELS-11.4 is designed to work seamlessly with APsystems APstorage batteries, creating a complete residential energy storage solution capable of delivering backup power, self-consumption optimization, and intelligent energy management. Whether you're retrofitting an existing solar installation or building a new solar-plus-storage system, the ELS platform provides a flexible and scalable path to energy independence.