Your battery is flat, 11.2V is too low for either lead acid or lithium batteries, you need to know what type you have. Secondly, you are not getting your batteries recharged, you need to get your batteries up to in excess of 14.0V each day to recharge them enough. You are using more power each day than you are putting back into your batteries.
In the short term you need a full recharge getting the voltage up above 14.2V until the battery current on the SmartShunt is below 10A, preferable 5A. Your solar is not going to be enough you may need to run your engine.
Your SmartShunt has not be set correctly, it has a setting " charged voltage", currently set at 13.2V, this is making the battery show it is fuller than it really is, it needs to be set at something like 14.2V (see FAQ linked below).
Finally for the moment, if you have lead acid batteries, as your batteries have been undercharged it is not known if they are failing or not, 74% should be 12.3V, 11.2V is empty but as the SmartShunt is set wrong the 74% can not be relied on. Once you get the SmartShunt reset and the batteries recharged then see how you go. If you have lithium batteries these do not.mind if they are not fully recharged.