Unlucky or miscalculated?

[MaximUK]

I have just upgraded my of grid system with 10x600w panels. This supplements the original 3x430w panels.
I have 3 different roofs to mount them on. The 600w panels are mounted 4 on an east facing roof and 6 on a west facing roof.
The east group are wired in series and to through a victron 250/60.
The west has a matching group of 4 with the similar charge controller. The remaining 2 to through a 150/35
The battery bank is now 2x48v batteries with 584ahr.

Yesterday, as the battery approached full charge, the circuit breaker between the battery and the the west X4 tripped and won't reset. The charge controller was second hand but has worked fine for a month on a smaller array.
The panels show voc 52.00v and Isc 14.44a. Vmp 43.4v Imp 13.83a.

Below I have pasted some graphs from the two 4 panel groups up to the point of failure.
Have I done something stupid calculating the charge controller size or have I just been unlucky and the charge controller has just failed?

 

[dopeassjackson]

Who makes the breaker? Your giving way to much info on what the system is and I believe you have 6x600w pannels on a 250/60 CC? How are they wired?

 

[MaximUK]

Sorry, not sure what you mean by too much info?

The groups are wired in series.

I am not sure what info you need about the breaker so here is a photo. It trips even if the solar isn't enabled to the CC.

 

[Brucey]

First thought is breaker has shat the bed. Voltages look well below the 250V max. Replace breaker first.

 

[Brucey]

Looks like you got to about 65A of output. A lot of those random Chinese breakers have trouble meeting ratings unlike say a midnite hydraulic magnetic fully rated breaker.(mnepv or mnedc)

 

[MaximUK]

I have just switched to the breaker happily running the other 4 panel string and it trips just the same sadly. I got quite excited that maybe it was something cheap that had failed. I will investigate upgrading the breakers I am using. The most I have seen from each string is slightly over 40a because they aren't orientated optimally. The strings also top out at just over 200v so I was hoping it wasn't the CC.

 

[Brucey]

If the other breaker also trips the scc may have failed.

 

[MaximUK]

That was my fear. But are you able to confirm that a 250/60 should be up to the job and I haven't missed something when calculating. At least I will know I was unlucky rather than stupid.

I wired the panels to CC with 10awg so I think I should be able to switch to 2p2s and replace it with a 150/60? That will make it slightly cheaper.

 

[Brucey]

Hopefully its still within its 5 year original warranty (warranty remains with unit not first owner).