Wrenches I have a question that I do not have an answer for that I can prove, here it is, I have 25 ABB 20 k. three phase inverters on a .5 meg ground mount site , I have also seen this on systems with SMA tripower and Fronius 8.2 and trio inverters on roof mounted systems, intermittently one combiner will blow a fuse and 9 times out of 10 it will be a negative fuse. PPA holders or CFO's of these systems would like to know why and other than a wake up surge or shade issue which could effect the negative side but that's really a stretch to say for sure. We have sites located in dry and wet locations around the islands, we have different brands of inverters but the fuses are what the inverter manufacture included in their combiner/switches. I am proposing to only use a slow blow fuse in the future with all of our new systems regardless of what is included in the combiners but with hundreds of fuses out there its a tough call to replace as they fail or just for it and change them all in advance per site. I Look forward to your thoughts and ideas, maybe its something else altogether. Jerry
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