Help me with a battery charger

A friend's recent dual dead-battery experience has persuaded me that I should invest in an inboard charger.

My boat has two batteries. It stays on a solar powered lift during the week. Throughout summer it gets used at least 3-4 days. The problem is that I can't easily get electric down to my lift which is solar-powered hydraulic.

Anyone have a solar powered solution?

If I can figure a way to run electric down there, what would be the recommendation?

thanks

For just 2 batteries and have power the most popular charger will probably be a ProMariner 20 amp dual bank charger. I haven't seen a reasonable solar charger with more that 1.25A and that's not nearly enough to desulfate a drained battery. However, doesn't sound like you guys drain the batteries if use multiple times per day several days per week. Guess it depends on battery type, stereo equipment, and how hard you play the stereo. Lots of factors in other words.