Solar PV system DC fuse keeps blowing

Hi!
I have a 6.5Kw system installed with a SMA Sunnyboy inverter. Works great normally. One DC fuse blew 2 years ago and I replaced. However, it blew again repeatedly every 6 months. There are four DC fuses and this particular one keeps blowing. Any idea why this is happening?
I am not a Pro.
Comments
Perhaps they wired your panels incorrectly. Do you have panels in a multiple of 4? maybe 28 panels which would be strings of 7 panels...
What mightbe happening is a bad connection internally, if the string is plugged into the inverter near the fuse and the connection is a bit loose or other connections are loose, the added heat will run along the line and may trip burn the fuse.
Around 1 amp is s ground fault detection fuse.
Most arrays, if you have any fuses, are around 15 amps or so.
Bill