Industrial sites with combined high temperature, dust and humidity tend to cause inverter overheating, leakage from dust accumulation and PCB corrosion due to condensation. Based on practical site conditions, this paper objectively analyzes hazards of harsh environments to inverters. It covers IP rating selection, power derating under high temperature and comparison of different inverter models. Supporting cabinet protection, installation layout and condensation control measures are introduced, together with routine operation and maintenance recommendations. Without exaggerated protection performance, the article emphasizes that inverter protection is a systematic project. All selection parameters shall follow manufacturer’s technical manuals, assisting engineers in proper equipment selection and reducing unexpected shutdown risks on site.