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 do you calculate the maximum output circuit current in a combiner box?

If three strings of these modules were connected in parallel within a combiner box, the maximum output circuit current, as outlined in 690.8 (A) (2), would be calculated by multiplying the modules’ I sc value by 1.25 times the number of strings placed in parallel: 8.7 × 1.25 × 3 = 32.7A.

What is a pvsmart combination box?

PVSmart Combiner Box Level 1 bundle the output lines of individual strings and to connect them to the inverter or optionally to a Level 2 Combiner Box. Smart design customized for each customers application with quick and innovative PUSH-IN connection technology to reduce the commissioning time in the field.

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.

What is the minimum conductor size for a PV output circuit?

This would result in a minimum conductor size of 14AWG with the rating of 20A in the 75°C column and the ability to be placed on a 15A OCPD. The PV output circuit would require a 75°C conductor rating of at least 40.8A or an 8AWG conductor.

How does a PV array work?

A typical PV array will consist of multiple modules wired in series, making a string of modules. The conductors connected to such a string are the source circuit conductors. If multiple strings are present, they are placed in parallel in a combiner box — either at the array location or at the inverter location.