What are the selection and maintenance of the photovoltaic system combiner box?

The photovoltaic combiner box is an important component of the photovoltaic power generation system. Its main function is to collect the output DC current of multiple photovoltaic components (such as solar panels) and transmit it to the inverter for conversion into AC power, or directly for DC loads.

The following are some suggestions on the selection and maintenance of photovoltaic combiner boxes:

How to choose a suitable photovoltaic system combiner box

1. Capacity matching: The rated current of the combiner box should match the output current of the photovoltaic component. The total current of all photovoltaic components in series needs to be considered, and a certain margin should be left.

2. Lightning protection and grounding: The photovoltaic combiner box should have lightning protection function and good grounding measures to ensure the safety of the system.

3. Protection level: Consider the protection level of the combiner box, such as IP65 or IP66, to ensure that it can work well in outdoor environments.

4. Monitoring function: Modern combiner boxes usually have data monitoring functions, which can monitor parameters such as current, voltage, temperature, etc. Selecting a combiner box with these functions will help maintain and optimize the system.

5. Circuit breakers and fuses: The junction box should be equipped with appropriate circuit breakers and fuses to protect the circuit.

6. Compatibility: The design of the junction box should be compatible with existing photovoltaic systems and equipment.

7. Installation and maintenance convenience: Consider whether the structural design of the junction box is easy to install and maintain.

Daily maintenance of the junction box of the photovoltaic system

1. Regular inspection: Regularly check the internal connections of the junction box to ensure that there is no looseness or corrosion.

2. Cleaning: Clean the outer shell and internal components of the junction box to maintain good heat dissipation conditions.

3. Circuit breaker and fuse inspection: Regularly check the circuit breaker and fuse to ensure that they are working properly. If damaged, they should be replaced in time.

4. Lightning protection and grounding inspection: Check whether the lightning protection device is normal and whether the grounding is reliable.

5. Monitoring and data recording: Regularly check the monitoring data, record and analyze the operating status of the system.

6. Temperature control: Monitor the internal temperature of the junction box to ensure that it does not exceed the specified safety range.

7. Timely maintenance: If any abnormal situation is found, such as damage to the box, abnormal current, etc., it should be repaired in time.

The design and installation of the photovoltaic combiner box are crucial to the performance and safety of the photovoltaic power generation system. Choosing a suitable photovoltaic combiner box and performing correct maintenance can effectively improve the stability and service life of the photovoltaic power generation system.