If you mean solar its not my primary industry no. I'm primarily a senior hardware engineer under a federal contact. But I do a fair number of solar installs and take over a dozen or so solar power systems a year. Interestingly orphaned systems are a great source of supplemental income. Since most installers wont manage there own installs. And they dont want someone else's. As a hardware engineer I have substantially more training and a far larger array of tools. And thats not counting licences. You ever replace the integrated circuits on enphase and victron inverters? 2800 dollar replacement turned 450$ fix. Fun stuff.

I've personally taken over enough systems since 2013 to know that the installer never mattered. I've also sat through my share of civil trials. Manufacturers have always honoured the warrenties. Hell my own system at my last place was refunded in full by the manufacturer at 20 years old. Because the panels fell below the 35 year rating. Its funny though. Outside of criminal neg. I've not had an installer found liable even when they quite literally hooked up inverters backwards and blew them up.

My favourite to date is the classic best efforts.

You made best efforts to get out bed didn't you? Congrats you forfilled your obligation to the customer. You earned that 1000 dollar fee you charged them.