I use two Trojan T125s at 240 total amp hours. My desired energy use survey determined I needed about 90 AHs per day, so I hardly ever dip below 40% DOD. The batteries are fully recharged almost every day by my solar system.
Since deep cycle batteries should be fully recharged daily for longest life, I don’t understand your “longer use” comment. Few 12 volt batteries are deep cycle. Trojan makes a couple. What make is your battery? What is it’s AH capacity? Does your solar watts equal your total battery amp hours? Why isn’t your solar fully recharging your battery daily?
