This morning, going through the email editions of American Solar Energy Society’s Solar@Work and PV Magazine, I came across an article on things found wrong during inspections of photovoltaic power systems, both at home and commercial installations. You might want to take a look at the article and then take a look at your own system! https://pv-magazine-usa.com/2019/09/19/solar-power-installation-techniques-dont-do-this-w-pictures/
–Neal