The DC Distribution Box (DCDB) is a vital component in a solar PV system that combines and protects DC power generated by solar PV strings before feeding it into the inverter.

This 2-in/2-out DCDB is specifically designed for small rooftop solar plants (10–20 kW), providing protection from overcurrent and lightning surges, ensuring safety, performance, and long-term system reliability.

Key Components Included

1. DC SPD – 1000V (2 Nos.)

   • Protects the solar system from lightning surges and transient overvoltages.

   • Type 2 SPD, designed specifically for solar DC circuits.

2. DC Fuse – 20A, 1000V (2 Nos.)

   • Individual string protection to prevent overcurrent damage.

   • Isolates faulty strings to keep the remaining system operational.

3. Terminal Blocks / MC4 Connectors (Optional)

   • Provides safe and secure cable connections for easy installation and maintenance.

4. Heavy-Duty Compact Enclosure

   • Built with rust-proof, powder-coated metal for durability.

   • IP65 rating for protection against dust, rain, and harsh outdoor conditions.

Functional Flow

• 2 Solar Inputs → DC Fuses (20A, 1000V) →

• DC SPDs (2 Nos.) for surge protection →

• 2 Outputs safely connected to the inverter.

Applications

• Small-scale Rooftop Solar Plants (10–20 kW)

• Residential solar systems

• Small commercial and institutional solar projects

• Hybrid and Net Metering installations