Previous owner most likely didn't like them visually lying around, but I agree why not just limit the inside to the mandatory ones and lessen the slack on the others outside the sump. I have two cables exiting my sump lid; the rest are adjoining the back up system neatly dealt with. Remember to get your back-up battery off the floor (piece of wood under it is sufficient) and to check it's function once in a while to ensure it's working. I find our 1 year old boat-like battery that came with the system gradually discharges over the months, even with adding distilled water and despite the indicator reading active.Most back up batteries are only good for 3 to 6 hours depending on rain volume/intensity. Enjoy your new home.