Burned DC fuse holder and cable (Grid tied)

[bcroe]

hope you can help me found out the reason for this one. see attachment

in this scenario, is it loose connection ?

My experience is, even if run below maximum, connections run at considerable power for long
intervals every day will have enough heat/cool cycling to eventually work loose what started as
tight connections.

After burning through a DC and an AC connection in a couple years, I am doing a complete
mechanical check of all connections twice a year. Already found one that might have been
headed for failure. And fairly often do thermal checks (hand and gauge) for any hot spots
at the end of a long power interval. I haven't had any MC4 problems yet, but a hot one
would cause immediate replacement of both halves. good luck, Bruce Roe

[squelch]

Is there any reason why there are 2 wires connected at the bottom of the first 2 fuse holders and only one wire on the other fuse holders?

Just thinking that besides a loose connection you might have exceeded the amp rating of that fuse holder.

they are jumper conductors to connect them in parallem, i think we should request that to our installer to replace it with flat bus bar like what i saw in the combiner bix on the net