Inverter or converter
Round hole set screw fastening stranded wire !
I use copper crimps normally used for joining several #12 or #10 solid wires
I slip it over the end of the stranded wire, crimp it, now I have a pin connector, put that in the terminal and tighten the set screw
If the crimped wire is too large for the terminal, but the wire is a close fit, I can apply solder to the wire, and make the end of the wire the pin for the terminal, crimping is quicker than soldering, and I have not had any problems with this method , a good tight crimp is a solid physical connection, and allows the set screw to get a good tight connection, no loose spreading strands