How can I fuse PV without a combiner box?

[SunEagle]

Anytime you have more than 2 parallel strings or panels you are required to have OCPD for each string. A combiner box makes it easy by having them all in one place but an inline fuse for each string will work. Not having this fuse will violate the NEC and can cause the wires between your panels and the CC to burn up if a short happens.

[somawheels]

Hi
I have 6X255w 24v solar panels wired in 3 strings of 2.
Currently I only have one 30a PV breaker, which is near the charge contoller end of the PV array. Im unsure how to fuse each string individualy or how necassary this is. I was considering using 3 Inline fuses (one for eachstring), but then began to question the effectiveness of these.
The panels are connected using 4mm mc4 connectors, before being connected to some (over sized) 35mm cable which goes to the CC.