LETOP Stable Supply Solutions for Solar Combiner Boxes 

The market needs stable supply solutions for solar combiner boxes without being expensive and LETOP addresses this need by helping you with their high-quality, readily available products. We understand the challenges faced by installers and do our best to simplify the process.
LETOP gives electrical circuit protection within solar installation. Our combiner boxes can safeguard the system from overcurrent, overvoltage and other hazards.

Solar Combiner Box for Residential Photovoltaic Roof

Recommended Combiner Box Solutions

5kW Residential Roof Solar System

A standard 5kW solar system can have around 12-15 solar panels that make approximately 5,000 – 6,000 kWh of energy annually and cover roughly 30-35 square meters of space. This system is good for small households with basic electricity needs.

1 String Solar Combiner Box 1 in 1 out

5kW Single String PV Combiner Box 1 in 1 out

Electrical Components

  • DC MCB 2P 63A 550V 1pc
  • DC Fuse 1P 15A 1000V 2pcs
  • DC SPD 2P 20-40kA 500V 1pc

Low maintenance and simple system design

The simplified design of this combiner box will lessen the maintenance requirements.

DC operation voltage

Combiner box works well for a 600V rating that is available in smaller residential systems.

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10kW Residential Roof Solar System

1000V DC combiner box is designed for professional combining solutions. Supports 1-4 string inputs and 1-3 string outputs. Maximum support for 1000V DC system voltage. IP65 protection rating and optimized heat dissipation design ensure your system operates stably in complex environments. You can also choose optional smart monitoring system. Fully meets the requirements of 20kW-50kW large residential rooftop and commercial rooftop PV projects.

2 String DC Combiner box 2 in 1 out

5kW Single String PV Combiner Box 1 in 1 out

Electrical Components

  • DC MCB 2P 63A 550V 1pc
  • DC Fuse 1P 15A 1000V 2pcs
  • DC SPD 2P 20-40kA 500V 1pc

Low maintenance and simple system design

The simplified design of this combiner box will lessen the maintenance requirements.

DC operation voltage

Combiner box works well for a 600V rating that is available in smaller residential systems.

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20kW Residential Roof Solar System

1500V DC combiner box is a professional solution tailored for large ground power stations. The combiner box supports a maximum of 24 string configurations, it is suitable for 1500V DC system voltages. It features industrial-level protection design, including string monitoring, RS485 bus/standard MODBUS-RTU protocol, arc fault detection, and fast shutdown/fireman switch functions. High-quality components and copper bus materials are used to ensure stable performance. Additionally, intelligent thermal spacing design achieves efficient heat dissipation, further enhancing equipment operational efficiency.

4 string PV Solar Combiner Box 4 in 2 out

5kW Single String PV Combiner Box 1 in 1 out

Electrical Components

  • DC MCB 2P 63A 550V 1pc
  • DC Fuse 1P 15A 1000V 2pcs
  • DC SPD 2P 20-40kA 500V 1pc

Low maintenance and simple system design

The simplified design of this combiner box will lessen the maintenance requirements.

DC operation voltage

Combiner box works well for a 600V rating that is available in smaller residential systems.

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 Common Challenges in Residential Rooftop Solar Systems

Complex Installation Process

Installing residential rooftop solar systems faces difficulties like complex wiring and component compatibility issues which can lead to an increase in labor hours.

LETOP’s Solution: At LETOP, we can help you with this with a simple interface design that is compatible with most brand components and inverters. This can make the installation process very simple. Modular and pre-assembled components can further reduce the wiring time by 30%. With our cost-effective design, you can also save on labor and on-site construction efforts.

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High Maintenance Costs

Maintenance and troubleshooting in solar installations can take a long time and cost a lot due to component failures or faults that can be difficult to diagnose.

LETOP’s Solution: LETOP Combiner boxes have a modular design that makes the replacement ofcore components easy and simple. Clear fault indicators will also help you identify issues quickly which can reduce the downtime. The front-opening structure will make it easy to maintain without needing to disassemble it that will save you time and effort.

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System Performance and Reliability

If your system is using bad quality components, it can lead to frequent system failures, low efficiency and poor system performance.

LETOP’s Solution: At LETOP, you can also get high quality components that have IEC, TÜV and CE certification standards to make sure you get long term reliability and the best performance. With a fault rate below 0.1%, we guarantee our commitment to quality.

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Supply Chain and Inventory Issues

If you are installing a system, delays in delivery of components or inconsistent inventory levels can delay your projects which can waste your time and increase costs.

LETOP’s Solution: We have a regular stock of popular models and a 72-hour shipping commitment will make sure you get your products at a time. Our long-term availability of core components will also stabilize the supply chain, and you will not have to worry about delays again.

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Limited Support During Project Design and Implementation

Lack of technical support can also lead to inefficiency in designing the system and potential delays in your projects.

LETOP’s Solution: We can provide you with technical support that include drawing reviews and system optimization suggestions that will help you throughout the project. With 24-hour technical consultation, you can get timely assistance during project execution.

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