About Faston connectors !!
Turns out the Victron converter came with it's own Faston connectors.
They look like this:

Except with insulation that's hard to remove if you want to solder. So I won't be using those.
I also got the connectors Mex suggested and some different ones like this (they're cheap :)):

The insulation on these last ones can be easily removed for soldering and then slid back on (depending upon the wire's insulation).
I also did a simple pull test on all three and that last one was definitely the best, with Mex's and the Victron ones being easier to pull off. That last one has a pronounced pimple that fits into the hole on the Faston male tab. It really grabs better than the others. But after a few on/offs I got the impression that the grab weakened and the pimple looked worn.
It's branding is: AMP - TE CONNECTIVITY Quick Disconnect Terminal, Ultra-Fast 250 Series, 12-10 AWG