No voltage at positive and negative poles of photovoltaic combiner box

How do you disconnect a PV combiner box?

Ensure the circuit breaker is in the “OFF” or “TRIP” position (or the load isolation switch is in the “OFF” position) to disconnect the combiner box from the PV DC output side. All fuse holders inside the combiner box should be open (or remove the fuse core using specialized pliers) to disconnect the DC combiner box from the PV string input side.

Does a PV combiner box have a DC disconnection switch?

The PV DC COMBINER BOX has a DC disconnection switch by default. The DC voltage of the switch depends on the voltage of the PV string. The switch disconnector mak- ing and breaking capacity (according to the IEC 60947-3) has been selected to assure that it can switch the circuit at full load at the maximum operating temperature.

What is a solar combiner box?

The combiner boxes are installed to join and protect the DC strings that go from the PV panels to the solar inverter. The PV DC COMBINER BOX product range offers solu- tions from 8 to 32 inputs and 1 or 2 outputs. These can be designed for systems with string voltage of 1000 or 1500 V DC.

What happens if DC cable polarity is reversed?

Reversed DC Cable Polarity: Inversion of the positive and negative poles in the string input lines could risk circuit damage upon closing the circuit. Reversed polarity of DC output cables, when the combiner box’s output cables are inverted, results in short-circuiting different combiner box components.

What is the enclosure of the PV DC combiner box made of?

The enclosure of the PV DC COMBINER BOX is made of Glass Fibre Reinforced Polyester (GFRP). The en- closure provides IP65 and IK07 or higher in accordance with IEC 62208. Each enclosure is equipped with hinged door(s). The PV DC COMBINER BOX has a DC disconnection switch by default.

Which conductors can be paralleled in a solarbos combiner box?

NEC Article 310.4 allows paralleling of conductors greater than AWG 1/0 to achieve higher ampacities. Most SolarBOS combiner boxes provide output terminals for paralleling two conductors for the PV positive and negative, as well as the equipment ground conductors. Refer to Figure 2 and Table 2 for the output wiring locations.