Basic battery charging and solar question

For reference: I just spent five days in my trailer, principally running the entertainment gear and an occasional 120V box fan. I didn't need the fridge running because I'm parked next to the house. I could have run a cord to the house but chose to run off inverter (I'm lazy..). Voltages never reached below 12.2 V, even on days that were overcast/raining. On days that were sunny, the 235W panel could charge the banks back up so that overnight loads were maintained and voltages were back up over 12.6 V.

Summary: While using the solar charging, the importance of battery capacity becomes evident. Having larger capacity (more batteries) makes life easy.