ABSTRACT

Donald Bastian Noya, The Electrical Energy Consumption Information System for a Property Business (supervised by Zahir Zainuddin and Rhiza S. Sadjad)

It is a well known fact that in a property business such as the apartment and commercial building rental, a tenant does not directly subscribe to the state-owned electrical power company. Their electrical energy consumption is managed by the owner or the landlord who is the only official customer with a kWh-meter.

This is a design project to develop an information system for both the tenant and the landlord in an apartment and commercial building rental businesses. The “Megamas” commercial area in Manado, North Sulawesi INDONESIA is considered as a case in this project. The area has 14 apartment blocks with the total of 301 tenants, 144 of them subscribe the electricity power capacity of 8800 VA, and the rest subscribe for 4400 VA.

The information system consists of a digital kWh-meter and a microcontroller-based display for both the energy consumption in kWh and the bill in rupiah installed at every tenant's place, connected via a local area network to a central computer at the owner's place. The microcontroller at the tenant's place can be programmed to compute the electricity monthly bill according to the owner's scheme, in such a way so that the total payment of all tenants does not exceed the owner's bill from the state-owned electrical power company. An example of the calculation is presented for a 8800 VA tenant whose usage of electricity in a month is 1880 kWh. The official bill is Rp. 2.282.500,- while the microcontroller computes the total amount of Rp. 3.294.000,- according to the owner's scheme. The difference of Rp. 1.011.500,- covers the owner's operational costs to maintain the system.