EXCB3-DC6-2 – 6 In 2 PV Combiner Box with DC Isolator

EXCB3-DC6-2 6 In 2 Out PV Combiner Box with DC Isolator – High Safety Standard for Large Arrays

The EXCB3-DC6-2 6 in 2 out PV combiner box with DC isolator from HUYU is designed to ensure the highest level of safety for large-scale commercial photovoltaic installations. It features manual DC isolator switches for all inputs and outputs, providing a secure, lockable disconnection point compliant with international fire and safety standards. Supporting dual MPPT inverters, the system separates six DC strings into two groups, each with its own dedicated output isolator. Integrated with a Type 2 surge protective device (40kA Imax), it offers robust protection against lightning-induced electrical surges for the entire array.

Encased within a IP65 and IK10 rated PC/ABS enclosure, it is specifically built to endure tough outdoor conditions. Arriving fully pre-wired, this DC isolator box minimizes onsite installation requirements to merely connecting PV strings and inverter output cables. Certified with CE, TUV, and CB standards, it fulfills international safety protocols. HUYU Electric also offers direct factory OEM/ODM services with private labeling and comprehensive documentation, making it an ideal choice for EPC contractors and solar distributors catering to safety-focused markets.

Technical Specifications – EXCB3-DC6-2

Manual DC Isolation for Uncompromised Safety

In emergencies like fires, the EXCB3-DC6-2 isolator solar combiner ensures first responders can visually verify that a PV array is de-energized. The lockable isolators can be secured to prevent accidental re-energization, delivering an added layer of safety. For system owners and maintainers, the device provides a safe operational environment.

OEM/ODM Supply – Safety-First Combiner Boxes for Commercial PV

Buyer’s Guide

How to Choose an Isolator-Type Combiner Box for a 6-String Dual MPPT System

Identify key considerations for selecting the EXCB3-DC6-2 for high-safety commercial PV installations.

1. Why Isolator-Type is Ideal for Safety-Focused Projects

Opt for the EXCB3-DC6-2 when compliance with electrical codes and safety requirements calls for visible, lockable DC disconnection. This level of security is imperative for spaces like commercial buildings and public-access facilities.

2. Optimizing Dual MPPT Inverter Performance

Designed for dual MPPT systems, the EXCB3-DC6-2 handles multiple string configurations while maintaining isolated circuits for independent energy optimization.

3. Reliable Overcurrent Protection

The EXCB3-DC6-2 uses optional 15A–32A DC fuses for primary overcurrent protection. These fuses effectively isolate faults, simplifying maintenance and ensuring operational reliability.

4. Simplified Installation

Pre-wired with clearly labeled terminals, this combiner box facilitates efficient, accurate installation. Its robust enclosure is suited to withstand outdoor conditions.

Frequently Asked Questions

What is a 6 in 2 out PV combiner box used for?

A 6 in 2 out PV combiner box is designed to consolidate six separate solar panel strings into two independent DC outputs. This configuration is specifically used with dual MPPT inverters. It allows you to connect, for example, three strings to one MPPT input and the other three to the second, enabling the inverter to optimize the power harvest from each group independently. This is a very common setup for commercial and large residential PV systems with complex roof layouts.

What is the advantage of a DC isolator over a DC breaker in a combiner box?

The primary advantage of a DC isolator is safety through a visible, lockable air gap. While a DC breaker can be manually switched off, it does not provide the same guaranteed isolation. An isolator, like those in the EXCB3-DC6-2, allows you to physically lock the switch in the OFF position, making it impossible for the circuit to be accidentally re-energized. This is a critical feature for fire safety and is often mandated by modern electrical codes for rooftop solar systems. Breakers, in contrast, are designed for overcurrent tripping, a function that is handled by separate fuses in an isolator-based box.

How to install a 6 in 2 out PV combiner box?

Installing a 6 in 2 out PV combiner box with DC isolator like the EXCB3-DC6-2 involves a few key steps. First, securely wall-mount the pre-wired enclosure near the PV array. Ensure all DC isolators are in the OFF position. Feed each of the six PV string cables through the dedicated Pg09 input glands and terminate them at the clearly labeled input terminals. Connect the two output cables to the Pg25 output glands and run them to the inverter’s MPPT inputs. Finally, connect the ground wire to the earth terminal. All internal connections are factory pre-wired, so no on-site assembly is required. Always consult a qualified electrician and follow local electrical codes.

Can I use a 6 in 2 out combiner box for a single MPPT inverter?

It is technically possible but not recommended. A 6 in 2 out combiner box is specifically designed for dual MPPT inverters. Using both outputs to feed a single MPPT input would require a separate junction box to re-combine the outputs, which adds unnecessary complexity, cost, and failure points. For a single MPPT inverter, a 6-in-1-out combiner box is the correct and more efficient choice, as it provides a single, clean output directly to the inverter. Always match the combiner box’s output configuration to your inverter’s input specifications.