Standard solar panels may still operate in rainy conditions, but they are not designed for long-term water exposure. Waterproof photovoltaic panels, on the other hand, maintain stable output even in heavy rain and high humidity. For manufacturers, installers, and end-users, it represents a reliable power solution that can withstand harsh environments—whether it's coastal salt spray, heavy rain, or long-term outdoor exposure. In addition to using available information from the literature, temperature measurements were also carried out on the. The present research, using finite element method simulation, studies the heat dissipation of a fin-type passive cooling system installed on monocrystalline photovoltaic panels under different environmental conditions associated with altitude.