You need to check the state of charge after "Charging all day" with the panels. My guess is the batteries were not full up to start with.
And at the 20 hour rate you have only about 1.5KWH of power there if that. I do not know how much TV or Fan use draws but you may be drawing power for other thigns like a fridge. that sucker can draw 'em down fairly fast if it's an Absorption type (about 400 watts running). Other loads may be present. This is why my inverter feeds a SUB panel.. not the main. Only TV's and other SELECTED loads on the sub panel.
