Over the past five years, I've interviewed hundreds of homeowners and business owners who have installed photovoltaic systems. When asked, "If you could do it over again, what do you wish you had known beforehand?" the answers were strikingly consistent: They underestimated the importance of "long-term maintenance" — and overestimated how "worry-free" the system would be. Many assume that after investing in high-quality panels and inverters, the next two decades are simply about sitting back and watching the electricity bill shrink. But the reality is: that glass surface exposed to the elements is far more delicate than you think. If you're considering installing solar panels — or have already placed an order but haven't started construction yet — this detailed guide from real-world experience is worth your 5 minutes. It could save you at least 30% in hidden costs over the next five years — and help you avoid many potential safety hazards.