...So I noticed that my house batteries weren't charging today......
I have 320W of solar on the roof wired in parallel, and run 10AWG wire from the panels to a Blue Sea fuse block (positive only) through a 25A fuse and on to the solar controller.
Here's what the fuse block looks like today:
......and here's the wire termination from the panels to the fuse block...
After an extensive post-meltdown forensic analysis (come on.....really??..
..), my conclusions are either:
I didn't tighten the fuse block terminal screw sufficiently and the contact resistance at the screw terminal created enough heat to melt the fuse block
or
The screw was sufficiently tight, but the thermal cycling of pumping 16A thru the terminal at high noon and cooling everything off at midnight slowly worked the screw loose.....increasing contact resistance at the screw enough to melt plastic.
...just happy my van didn't burst into flames.....