No, you won't damage them at that voltage, you just probably aren't getting them charged as fast as you could. Does your charger have the ability to put an
equalization charge on them? Not being able to do that occasionally is hurting the longevity of your bank. Trojan recommends every 30 days. I don't do it that often on my T-125's but I do try to not go more the 75 days between.
https://www.trojanbattery.com/pdf/Tr...UsersGuide.pdf
Are you surprised your batteries are not topped off by your
wind and
solar capacity? That is comparing your
consumption vs total Ah of the bank vs your
charging capability? What are you using to determine the state of charge of the bank?
I have a 4 T-125 and 380W of solar. The solar is normally enough during the cruising season in
New England. Our biggest draw is the fridge (or course). I think we use about 90 Ah per day overall.
Harry