What are you using to check the battery charge state?
As said above, 110ah is very little storage capacity, and you obviously are taking out a little more each day than you are putting back in.
Optima batteries are usually not true deep cycle batteries....
Sunlight hours, direction of sun rays to panels, any type of shading during the day--all can reduce efficiency of the panel output.
Twinboat said it well...
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'16 40QBH Phaeton
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