Victron 10000 va inverter blew up

yrtrnc said:

There has been drilling going on lately, could it be that one of the wires was drilled through and line and neutral is in contact? Would this damage the inverter like this? There are no signs of high load spikes in the log files! 

Someone was drilling holes in the inverter case ?  No warranty for you.
Dead short line - neutral inside the case has no OCP . 
10Kw inverter, I hope it was a 48V unit.   Something had to have gone very badly wrong  to blow up like that

>  The 32 amp rcbo is connected to a 2000 w grill  and a 1800 w kettle. 
What is a rcbo ?   2000 grill and 1800 kettle are not insignificant loads.  Together, they would draw about 80A from a 48 v battery, or about 40A each.  Either of those is over 32A

Hard to tell from the image but it could have been a capacitor failure, the residual current circuit breaker, RCBO, which is a ground fault main breaker for the benifit of those who aren't familiar with the term, would have tripped on any external short.

How old is the inverter, could you post a wider image which would show where exactly the fault occured? 

That was a pretty hefty burst of current thru that wire, to totally vaporize the insulation off it .   Whatever caused it, it was bad.

A short in a branch circuit would likely cause failure in the smallest conductors if the overcurrent is sized greater than it current carrying capacity of the conductors downstream of the RCBO, likely smaller than the one in the image. Furthermore inverters tend to self protect against short circuit faster than a breaker can react due to the trip curve criteria, thus the damage may be unrelated to the RCBO's performance.

There is a difference between a dead short and a ground leakage, a dead short would be the same as a load, both live and neutral carrying equal current, a leakage, or residual current is the differential between the current carried in the live and neutral conductors. Therefore in a short condition the rated amp capacity of the device would be relied upon as an overcurrent protection device, there would be no imbalances to cause a leakage trip.

Regardless the best course of action would be to contact the dealer to initiate an RMA (return merchandise authorisation) for a warranty claim,  it could have been something simple as a bad crimp which caused overheating, something that is possible even with the best products on the market. My opinion, for what it's worth, is its unlikely the fault was caused by a short circuit but the manufacturer may see things differently, your call on the information provided.