That ProMariner charger product series IS NOT WATERPROOF
. It is not 100% sealed; it has venting, so water can get into the chassis.
ProMariner is a good company with significant marine system design expertise. They were (and are) a major company with many electrical system products for large boats (and even yachts). That product is for dry "equipment rooms" on-board larger vessels. They have some good charging products, but that's not the product line you'd want. The ProTournament Elite Series offers the best charging capacity and is a better choice for serious anglers who fish long hours, and often. The ProSport Series has lower total amperage ratings; it's OK for the average guy looking to save a few bucks.