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Combiner Box

Your Professional Combiner Box Supplier

 

Wenzhou Shuowei Electric Co., Ltd. （SUVELL）is a high-tech enterprise specializing in the research, development, production and sales of transformer accessories, switch cabinet accessories, cable accessories, power fittings and transmission line accessories.

Our product portfolio includes pad-mounted transformers, pole-mounted transformers, oil-immersed load break switches, switchgear systems, and switchgear components.

 

 
 
Why Choose us
 
 

Quality Assurance

The company is equipped with comprehensive production facilities and a robust testing system to ensure that all products meet international standards and satisfy customer requirements.

 
 
 

Professional Solution

With extensive experience and personalized one-to-one service, we are capable of assisting you in selecting suitable products and providing professional answers to technical inquiries.

 
 
 

Reasonable Price

Supported by a dedicated procurement and cost-control team, we strive to minimize production costs and optimize profit margins in order to offer you competitively priced solutions.

 

 

Parameter

 

 

Place of Origin

China

Model Number

Combiner Box

String

1 string to 36 string Customized

Rated Operational Voltage (Ue)

AC 230V/400V480V/690V/800V; DC 600V/1000v/1500v

Enclosure Matertial

Plastic/ Power Coated Steel

 

Benefits of Combiner Box

Enhanced Safety

Combiner boxes are equipped with overcurrent protection, surge protection, and other protective functions, ensuring that PV systems are protected against overcurrent, lightning strikes, or voltage fluctuations. Through DC isolator switches, combiner boxes can disconnect the connection to solar panels when needed, ensuring that maintenance personnel are not exposed to direct current hazards.

Improved Efficiency

Combiner boxes consolidate the direct current outputs of multiple solar arrays, reducing the length of wires and cables used. This helps minimize voltage drop due to wire resistance, thereby improving the efficiency of energy transmission.

DC Combiner Box
PV Combiner Box

Simplified Installation

Current consolidation by combiner boxes reduces the number of connections and wires required, simplifying system installation and reducing the likelihood of faults. Additionally, cable management becomes more organized, reducing cable wiring complexity and maintenance difficulties, thereby enhancing system maintainability.

Real-time Monitoring

Some combiner boxes come equipped with monitoring systems that can continuously monitor performance data for each PV array, including current and voltage. Maintenance personnel can also promptly identify and resolve faults such as abnormal voltage or current with the problem detection function.

 

Safety Precautions for the Combiner Box
 
 
 

Surge Protection

Ensure your combiner box is equipped with Surge Protection Devices (SPDs) to shield the system from power surges and lightning strikes. This helps prevent damage to the solar panels and other components.

 
 

Overcurrent Protection

Combiner boxes should include overcurrent protection devices, such as fuses or circuit breakers, to prevent electrical overloads that could lead to fires. These devices interrupt the flow of electricity when current levels exceed safe limits.

 
 

DC Isolation

To prevent electrical shock and ensure safe maintenance, combiner boxes should have DC isolation features. This allows for safe disconnection of the DC circuits during repairs or inspections.

 
 

Quality Control

Always choose a reputable brand and ensure that the combiner box meets industry standards and regulations. High-quality combiner boxes are less likely to fail and can provide reliable protection for your PV system.

 

 

The Structure Of The Combiner Box

 

 

DC molded case circuit breakers (MCCB) - MCCBs are found in high-power PV systems and help protect circuits under currents between 63A and 630A. Although it is important to note that specific current rating of the MCCB in a combiner box would be based on the system’s design and the size of the array, as different systems require different circuit protection ratings.

 

PV String fuses - PV String fuses are designed to interrupt electricity flow during incidents. They help protect the system from overcurrents that could cause damage. Fuses are used to protect individual strings from faults (e.g., short circuits) and should be rated according to the string’s current.

 

DC surge protection devices (SPD) - SPDs conduct power surges into the ground to protect the system from damaging transient overvoltages.

 

DC disconnect switch or DC circuit breaker - The disconnect switch or circuit breaker will cut power during a surge or short-circuit to protect the rest of the system.

 

Busbar - The busbar is typically used to combine incoming negative or ground leads from solar panels. It is a conductive metal strip with multiple connection points that connect incoming wires to a single unit.

 

Terminal Strip - The terminal strip functions like the busbar but is made up of ABS composite instead of metal.

 

Enclosure - The combiner box is contained in a box made of PV or ABS material. It should be dustproof, windproof, waterproof and treated to handle ultraviolet light.

 

Applications Of Combiner Boxes

 

Residential Settings

While most residential setups do not require solar combiners, bigger residences with higher energy demands might benefit from the organizing and safety features they provide. For smaller residential setups, pre-made combiner boxes with basic features are usually sufficient.

Commercial And Industrial Settings

Larger-scale solar power systems in commercial and industrial settings, with several solar panels and strings, will benefit the most from the use of solar combiner boxes. These larger systems can experience significant material and installation time savings, making them a cost-effective solution.

PV Grid-connected Box

 

Logistics

 

 

We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

》The time frame of an order delivery is divided into two parts:
Processing time: 7-14 Days
Shipping time: 20~30 Days
》Shipping methods: DDP, DAP, EXW, etc.
》Shipping fee: The shipping fee will be changed according to every pacel's weight.

 

 

FAQ

 

 

Q: How to choose a combiner box?

A: Many commercial applications will use larger panel wiring than residential projects. Overcurrent protection is an absolute must when purchasing a new PV combiner box. You want to choose a box that has the right voltage rating and overcurrent protection for the size of panels that you'll be using.

Q: How many combiner boxes do I need?

A: You need to determine how many solar strings your system has. For example, if you have 20 solar panels and configure them into 4 strings with 5 panels each, then you will need a combiner box that can accommodate at least 4 strings. This ensures that each string has a dedicated input into the combiner box.

Q: Is a solar combiner box necessary?

A: Yes, a solar combiner box is generally needed for solar panel systems with more than three strings (groups of solar panels connected in series). It simplifies wiring, improves safety, and protects the system from electrical faults. For systems with fewer strings, a combiner box may not be necessary, and direct connection to the inverter may be sufficient.

We're professional combiner box manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale bulk combiner box in stock here from our factory. Contact us for quotation.

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