I would fully charge and remove the cables. To me there seems to be less risk of something going wrong. If you forget to clear the panels will the house suck the batteries down to nothing? If something were to happen to the solar charging system would the batteries be sucked down to nothing? Seems disconnecting the cables is pretty low risk. You said you previously removed the battery, if so and you have it at home you could throw a charge on it in the middle of winter just to be sure. Extremely unlikely but having everything dead removes any fire risk also. You know.....mouse chews through wires, fire starts......