Exide makes true deep cycle marine batteries but I'm betting the ones in the Solera are dual purpose. There is a DC in the model number of their marine batts so I'm betting there should be a DC in the model # of any other TRUE deep cycle batts they make.
In any event...that has more to do with life cycles than capacity and they give their batts an 80 and 100amphour rating for their Grp.24 and Grp. 27 batts respectively.
I'd knock each of those down by 5 amp hours for planning purposes since they are not brand new and have probably lost some capacity due to your discharging them way below 50%.
So...if you have a pair of group24's...that adds up to 150 amp hours total
If you have a pair of group 27's ... you have 190 amp hours.
Divide by HALF to see what you can use each day before you need to recharge...i.e. 75 and 95 amphours respectively.
Your solar controller SHOULD be able to monitor what you are putting in and taking our of your batteries each day if you buy a good one. Otherwise you need a true battery monitor like the Trimetric or Victron which will look at ALL sources of amphours (solar, genny, alternator) and all drains (all 12V and inverter loads) and let you know where you stand at any moment.
EDIT: Once installed...If your monitor is showing 50% remaining and your lights are getting dim...you've done a lot more damage to your batteries by deep discharging than we think...and you'll need to replace them.
2015 Georgetown 280DS
2014 Vespa LX150 2014 StellaAuto 125