Combiner box voltage, is it right?

[tonyg]

Hi,

I'm looking at voltacon combiner box here:

PV Combiner DC Switch Box 4-Way Input 2-Way Output

Solar DC String Box. The enclosure is built to high industrial standards and includes, fused PV-string terminals, surge protection devices and DC-isolators.

voltaconsolar.com

It gives me an option for fuses and an option for voltage... For fuses it is easy: 1.25 X ISC, or simply go by the panel's suggestion on its sticker for "max series fuse size" - in my case 20 A.

The question is, for voltage, do I go one step up from the Voc, i.e.: my Voc is 123.6 V, so choose the 150V option. Or is there a calculation I don't know about?


Thank you.

 

[sunshine_eggo]

The maximum voltage must be under the rated voltage of the box/fuse/breaker.