I could say something glib "Like I am sure that is wrong" because of the compelling evidence you have presented. However you have given any data. Have you measured the items that you have connected for their consumption? (for this an inline power meter would be a good investment)Have you checked the operation of the major energy consuming items to confirm they are operation correctly?These items would include Fridges, Freezers, Air Conditioners, Electric Heaters, Hot Water Services, Incandescen ...