Solar PV Combiner Box 4 To 24 Strings
Heavy-Duty Enclosure: Metal housing with anti-corrosion coating. IP65 rated for extreme weather.
Advanced Surge Protection: Type I/II SPD (MOV) diverts surges >15 kA instantly. Clamps voltage below 2 kV.
Smart Monitoring: Real-time tracking of string current, voltage, and temperature via RS485/PLC.
Multi-Layer Safety: NH00 DC fuses + MCCB protect against overcurrent, short circuits, and reverse currents.
Cost-Saving Design: Converges 4-24 strings into 1-2 outputs. Reduces DC cables and installation labor.
- Product Introduction
Products Description
Core Functions
| Function | Description |
|---|---|
| Current Convergence | Combines small string currents (10A–20A) into larger output paths. Reduces DC cables and line losses. |
| Circuit Protection | Each input uses NH00 fuses or MCBs (20 kA breaking capacity). Output uses DC MCCB for overload/short-circuit protection. |
| Lightning Protection | T1/T2 SPDs (In≥15 kA) divert surge currents to ground in milliseconds, protecting modules and inverters. |
| Smart Monitoring | Collects string current, voltage, temp, and SPD status. Transmits data via RS485/PLC/Wi-Fi for remote fault localization. |
| Reverse Current Block | Anti-backflow diodes prevent circulating currents. Optional isolating knife switches allow safe maintenance. |
| Safe Distribution | Delivers converged power to the inverter with full overload and reverse-connection protection. |
Main Components & How It Works
- Enclosure: High-strength metal housing with anti-corrosion properties.
- DC MCCB: Automatically disconnects the circuit when current exceeds safe limits.
- DC Fuses: Overcurrent protection, typically utilizing NH00-type fuses.
- Anti-Reverse Diodes: Prevent dangerous reverse current flow between strings.
- Surge Protective Device (SPD): MOV-based technology. High resistance normally; low resistance during surges.
- Data Acquisition Module: Monitors operating parameters in real time.
- Terminal Blocks: Secure connections for multiple PV strings.
During the day, DC power from each PV string enters the box and passes through the fuses. The current converges onto the busbar, exits through the DC circuit breaker, and flows to the inverter.
- By Function: Standard (Basic protection), Intelligent (Remote O&M), Anti-Backflow (Reverse current blocking).
- By Environment: Economy (Residential), Wind/Sand Resistant (Special air ducts for deserts), Plateau/Coastal (Military-grade protection).
- By Voltage: 1000V System (Traditional mainstream) | 1500V System (Compatible with new bifacial modules, reduces BOS costs).
- Large-Scale Ground-Mounted Power Plants
- Distributed Rooftop PV (Residential & C&I)
- Wind-PV-Energy Storage Integration
- Industrial & Commercial Sectors (Factories, Malls, Office Buildings)
FAQ
Q: What is the difference between standard and intelligent combiner boxes?
A: Standard boxes focus on physical protection and current convergence. Intelligent boxes include a data acquisition unit that monitors each string's performance remotely. This allows you to pinpoint faults (like a blown fuse) instantly, saving massive O&M costs.
Q: Can this box handle extreme weather like sandstorms or coastal salt spray?
A: Yes. We offer specialized models. The Wind/Sand Resistant type features a special air duct design for dusty environments, while the Plateau/Coastal type uses military-grade protection against extreme conditions and salt spray.
Q: Do you support 1500V systems?
A: Absolutely. Our 1500V models are fully compatible with new-generation bifacial modules. Upgrading to 1500V helps reduce balance-of-system costs and improves overall efficiency in large power stations.
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