I've got the 175s. SCsolar recommended Sharp as they have one of the more sturdy aluminum
frames, the monocrystalline 175s are not as effecient as the current
leader, which is Sunpower, for efficiency, but they were the most efficient panels being produced prior to Sunpower. The Sharp 175s are also shade tolerant. And yes, they do have an exclusion for exposure to saltwater. Every solar
panel has a broad disclaimer on "abuse" or inappropriate installation
, so I'm sure if you ended up dunking a panel in the water
most panel manufacturers would void the warranty.