Afternoon all - I have a dual 12v 100w panel set up in parallel wiring connected to a p20L - this feeds a single marine-deep Cycle DuraStart battery [182 RC Mins @ 25A/105Ah Cap 20Hr rate]. This set up is providing battery power to LED light signage - has worked fine for about a year, then I went to check it out and it had clearly leaked all over the place. I was concerned with Overcharging, but filled it with distilled water (and put it into a battery box for the mess) checked the p20L settings - everything seemed to be fine: Float Charge 13.0v low voltage reconnect 12.6v low voltage disconnect 9.0 battery b03. After filling it with water, it ran the longest we've ever seen, from about 5pm to 5am. Then two days later, dropped to 5pm to about 130am so I checked it - again clearly water leaked, and now the battery is pretty clearly swelling on the sides. Any suggestions to possible causes? Do I have something set incorrectly? Wondering if Wx is playing a factor - this set up is out of direct weather in an insulated box. Any suggestions appreciated.