I went with a wet 12 volt Deep Cycle size 27, I don't know if its considered dual purpose. I know the Interstate guy and he said the extra money for AGM probably wasn't worth it for what I was doing. I actually have the same battery in my fishing boat and its about 4 years old although I do keep a trickle charge on it 24/7, which I did read if you keep a charger on the batteries they will last a lot longer and that's why I put a portable solar charger on my house battery.
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