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If you have used the dob battery there is likely to be a potential difference between your battery bank and the dob battery. This mean when you do connect them they will equalise, maybe with a spark. I have a similiar setup with a solar charger feeding the battery bank in my shed. To avoid any night time drama with cable connections I simply charge my scope battery the next day off the solar system usually by just running my AC charger off the bank inverter. This smart charger will manage charging the scope battery and go to float when finished. But hey it will work if you just connect them but be aware of the potntial difference and that they will pull down as they equalise.
BTW I have the same solar regulator (30A in my case). Do you have a fuse on the bank? It doesn't look like you are running the load off the regulator so you should have protection between the bank load (ie the inverter pictured) and the bank. I would also suggest a marine battery switch so you can isolate the bank from the load.
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