Hello Bob,
I've the same concern, but really hasn't been an issue....pre-flight check for solid connections.
I have a battery tender plug routed to the panel for in between flight charging. Often thought of carrying a small battery and lead to plug into the panel if needed...just haven't scratched that itch yet! It's amazing how much of the time in flight that I find myself eyeballing the volt meter....
Frank
LEU 55-L