Reviewing Solar and batteries for retirement

I have had Trojans t125 on my other TT for 10 years when I sold them, still going strong. We dry camped with a generator. Our new to us TT is beginning its 4th season with the same batteries that I bought new for it. The key to batteries when dry camping whether solar or shore power, is to not let them draw down below 50%. You can check the battery charge with a simple volt meter and a chart (download one at Trojan) or fancier is a battery meter hard wired. For 10 years I used a simple volt meter plugged into the cigarette plug by the tv and Velcro to the wall. Worked Great. In our new to us I added 428 watts solar and bought the TriMetric 3030. The Tri Metric measures all kninds off things but I keep it set on Battery %. Simple read. I have never had to add more than a splash of water. So I think that two things could things could be happening. Your charger is over charging to high a voltage and or you have drawn your batteries down to far. We also have a Xantrax inverter. I found that the entertainment circuit, runs the TV's and some outlets front and rear. I removed that from the 110Volt panel and plugged it into the inverter. Its that way all the time. When dry camping I just turn it on. We watch TV movies, charge our phones pc, etc and when lazy, use the electric coffer pot.I also hanged all the interior lights to LED. We dry camp as much as FHU . I hope this helps you!