I had a 55 amp Parallax. Thank goodness it went south so I had to replace it. With the Parallax I had to unplug here at home after a day or two to recharge the battery. I'd then disconnect at the battery switch to eliminate parasitic draws. Check the water level at least once a month.
I got the PD9260 (PD-Progressive Dynamics, 92-9200 sires, 60-60 amps) as a replacement, cost under $175 and worth every penny. Simple install if it hadn't been for a brace behind the box. I've added water to the batteries 3 times in the last yr never down to the plates. It's been plugged in 95% of time since Christmas, before that I was constantly checking to see how the PD was working.
