Each battery has a specific charge profile, often expressed as a voltage range.
Either A find a battery whose profile matches the output of your charge sources, or
B make sure your sources match the needs of your chosen battery.
In either case only consider a proper, quality true deep cycling battery.
For option B, a DC-DC charger like Sterling BB series will accept alternator or solar output that is not suitable, and let you adjust the voltage to one that is.
Or with that CTEK you need to use option A since it is not adjustable.