ProMariner ProSport 20 Plus, 3 bank on board charger. Model # 43021. 100% waterproof. 12/24/36 volt. 20 amp output. Digital Multi stage charging AND battery reconditioning. Will charge group 24, 27, 29, 30, 31 size batteries. Works with Standard lead acid, AGM, Gel and AGM high performance batteries. Comes with oringal owners manual. Excellent condition, works as it should. Charger was hard wired but comes with its original plug. Price $100.
Here is the link for more details.
www.promariner.com/en/43021
