Power supply of photovoltaic combiner box monitoring unit

What is included in a PV combiner box?

In order to enhance the reliability and practicality, PV combiner box is equipped with DC Anti-thunder protection module, DC fuse, circuit breaker and some functional circuits, such as Control and Processing, Working State Monitoring and Communication circuits, etc.

What is a DC combiner box?

Our DC combiner boxes offer users the possibility to integrate short-circuit and overvoltage protection, as well string monitoring solutions (I,V, T and SPD and switch isolator status), for PV systems using central inverters with PV panels in trackers and fix tilt systems.

How many solar panels are connected in a combiner box?

Solar panels Combiner box 10 to 20 panels are connected in series per string. Up to 20 strings are connected in parallel, and the lines are concentrated to a combiner box. Fig. 1. Configuration of the string monitoring system

How are PV DC combiner boxes tested?

PV DC combiner boxes are tested according to IEC-61439-2 and are constructed on the basis of the test results as well as assembled for the specific application. This ensures that each of the requirements of the target application is fully met.

How many solar panels are in a string monitoring unit?

Each string consists of about 10–20 solar panels connected in series. Furthermore, the string monitoring unit can be retrofitted easily. This paper reports the characteristics and specifica-tions of the string monitoring unit, and the results of the analysis of power generation data obtained by the system. 2.

Where is a string monitoring terminal installed in a combiner box?

string monitoring terminal unit is installed in the free space inside a combiner box (see Fig. 4). A clamp type current sensor is installed on each string in the combiner box. Repeaters are installed in the junction boxes or PCS input terminals, to ensure stable communication.