Overview of the 1500V DC Combiner Box for Solar Applications

1500VDC | 28 String Inputs | 400A Disconnect | NEMA 4 Enclosure

The Yaskawa Solectria CR1500-28P-20F-400S is a high-capacity, utility-grade DC combiner box engineered for commercial and large-scale solar installations. Designed to operate in 1500VDC systems, this combiner provides efficient string aggregation, robust protection, and seamless integration with modern string inverter architectures.

Built for durability and performance, it features a NEMA 4 outdoor-rated enclosure, making it suitable for demanding environmental conditions while ensuring long-term reliability in field deployments.

Key Features

• Supports up to 28 PV strings for large-scale system design
• 1500VDC rating compatible with modern high-voltage arrays
• Integrated 400A load-break disconnect switch
• Factory-installed 20A fuse holders for string-level protection
• NEMA 4 enclosure for outdoor use and weather resistance
• Pre-engineered design for simplified installation and reduced field labor

Performance and Protection

The CR1500-28P combiner box is designed to centralize DC inputs while providing critical circuit protection. Each string is fused for overcurrent protection, while the integrated disconnect allows safe isolation for maintenance and service. The high-current bus and robust internal design ensure efficient power consolidation with minimal losses.

Ideal Applications

• Commercial and industrial (C&I) solar systems
• Ground-mount and fixed-tilt arrays
• Community solar projects
• Utility-scale installations

System Integration

This combiner box is optimized for use with Solectria 1500V string inverters, providing a streamlined solution for projects requiring high string counts and centralized DC collection. Its design supports reduced homeruns and improved balance-of-system efficiency.

Product Specifications

• Model: CR1500-28P-20F-400S
• Maximum DC Voltage: 1500VDC
• Number of Inputs: 28 fused string inputs
• Fuse Rating: 20A (per string)
• Output Disconnect: 400A load-break switch
• Enclosure Rating: NEMA 4 (outdoor rated)

Why Buy from Solarcellz USA

Solarcellz USA delivers high-quality, Tier 1 solar components with competitive pricing, dependable logistics, and expert support for commercial and utility-scale projects.

High-Capacity 1500V DC Combiner Box for Efficient Power Management

The Solectria CR1500-28P-20F-400S is a robust 1500V DC combiner box designed to streamline solar energy systems by safely combining up to 28 fuse-protected inputs. This product is engineered for high-voltage DC applications, providing excellent current carrying capacity with a 400A rating. Perfect for large scale photovoltaic systems, this combiner box simplifies wiring, enhances system safety, and reduces downtime with its durable construction. The inclusion of 28 fuse positions allows for precise and effective circuit protection, ensuring reliable operation even under demanding conditions.

NEMA 4 Rated Enclosure Ensures Durable Weatherproof Protection

This 1500V DC combiner box features a NEMA 4 rated enclosure, guaranteeing superior protection against harsh outdoor elements such as rain, dust, and dirt. The sealed design makes it ideal for installation in exposed environments, ensuring long-term durability and consistent performance. Its rugged enclosure protects sensitive internal components, reducing maintenance needs and safeguarding your solar power system investment. The NEMA 4 classification aligns perfectly with industry standards required for outdoor electrical equipment in solar power setups.

Versatile and Safe Fuse Setup for Enhanced System Reliability

The Solectria CR1500-28P-20F-400S includes 28 fuse holders designed for maintenance-friendly fuse access and replacement. This arrangement improves operational safety by isolating faults and preventing system-wide failures. Each fuse slot facilitates rapid troubleshooting and component replacement, decreasing downtime. This product’s versatile fuse layout accommodates a variety of fuse sizes, making it suitable for complex solar arrays requiring customized protection schemes. Together with the 400A current rating, this combiner box ensures your solar system operates smoothly, efficiently, and with heightened reliability.