Read the warranty documents from other solar panel manufacturers and you may find that their warranty is void if you install their solar panels near a marine or salt water environment.
Mitsubishi Electric has conducted substantial testing to verify the effects of salt water exposure on their PV modules. They found that Their PV modules maintained a sufficient level of insulation from the corrosive effect of salt air and ocean front environment to maintain the power output specifications included in its warranty. Their MLU series modules are approved for installations near salt water - a benefit that sets their modules apart from others in the solar industry.
If Mitsubishi's new PV-MLU255HC series solar panels can survive a grueling salt water environment, just imagine how well they'll survive in your environment.