SolarEdge Power Optimizer S440

SolarEdge Power Optimizer S440 — High-Efficiency PV Module Optimizer for Residential Inverter Systems

The SolarEdge Power Optimizer S440 is a module-level power optimizer designed to maximize energy harvest in residential PV installations when used with SolarEdge inverters. It detects abnormal PV connector behavior to prevent potential safety issues and provides module-level voltage shutdown for installer and firefighter safety. With an exceptional efficiency of up to 99.5%, it mitigates all types of module mismatch losses—from manufacturing tolerances to partial shading—while enabling faster installations through simplified cable management and easy assembly using a single bolt. The system's flexible design allows maximum space utilization and it is compatible with bifacial PV modules. A design specification PDF is attached for technical reference.

Applications and use cases

The S440 optimizer is specifically designed to work with SolarEdge residential inverters, delivering targeted module-level optimization across typical rooftop PV arrays. It enhances system performance under shading, mismatch, and high-tolerance conditions, while offering real-time module performance visibility. The compact, bolt-on design supports quick rooftop deployment, and its compatibility with bifacial modules expands the potential for higher energy yields on suitable installations.

• Module-level optimization for residential rooftop systems
• Real-time monitoring of module performance to confirm peak output
• Support for bifacial PV modules to capture additional energy
• Module-level safety features, including voltage shutdown for emergencies
• Fast, cable-friendly installations with a single-bolt mounting approach
• Space-efficient, flexible design for varied roof layouts

Key electrical and performance parameters

The S440 delivers high efficiency in a compact form, with electrical ratings that support reliable, module-level optimization in typical residential configurations. The device is engineered to handle standard residential inverter setups while maintaining safety margins across its operating range.

• Maximum efficiency: 99.5% (peak)
• Weighted efficiency: 98.6%
• Absolute maximum input voltage (Voc): up to 60 V per input
• Maximum short circuit current (Isc) of connected PV module: 14.5 A
• Overvoltage category: II
• Dimensions: 155 mm (L) × 129 mm (W) × 30 mm (H)
• Weight: 0.655 kg
• DC connection: MC4
• Designed for use with SolarEdge residential inverter systems
• Compatible with bifacial PV modules

Mechanical design and installation

The S440 is engineered for reliable rooftop deployment with a compact footprint and streamlined cabling. Its simple, single-bolt mounting enables faster installation while its modular design maximizes space utilization and supports flexible module layouts. The enclosure and connectors are tailored for easy integration with standard SolarEdge residential systems, ensuring safe and durable operation in typical installation environments.

• Compact, lightweight enclosure for easy integration
• Single-bolt mounting for rapid installation
• Flexible design to accommodate varied roof and module configurations
• Durable enclosure with standard DC MC4 connections
• Optimized for safe operation within SolarEdge residential inverter networks