The smart card prepaid metering system consists of the kWh submeter, card reader, smart card and credit dispensing unit. It charges tariff based on the actual energy consumed by the tenant, this greatly changes upon the traditional method of including energy in the rent or in using square footage as the basis for energy billing.

This method allows for a more effective way to manage energy billing and prevent wastage, and also fair to all parties concerned.

IC Card Prepaid System

Energy Saving

Air conditioning tariff

Air Conditioning Tariff

Prepaid smart card meters are simple to use and fair to all parties, they are an integral part of any effective energy management strategy.

Since prepaid smart card meters are based on a user pays system, it can effectively change the energy usage habit of the tenant. By having the user pay only for the energy used, they would be more inclined to turn off the power when it is not in use or when they leave the room as they would need to take the card with them when they leave. This alone can result in significant energy savings, and it prevents wasted energy.

The act of having to insert the card by itself is also an energy management strategy, as for example, without a card, then the user won't be able to turn on the air conditioning. It can also be used as a means to encourage the user to limit their air conditioning usage, such as when an allowance is provided for free. Once this free to use allowance is used up, subsequent energy consumption would need to be paid for out of pocket by the user.

Tenant Billing

Dormitory energy tariff


In the traditional method of tenant billing, someone must manually read the meter, generate the bill and collect the payment. Not only is this time consuming and labor intensive, it can also easily result in dispute between the landlord and the tenant. At the same time there is also the risk that the bill would not be paid.

With a prepaid card meter in place, the job of the landlord is greatly simplified, as all manual meter reading, generating the bill and payment collection are all eliminated completely. There can be no dispute as everything is transparent, the tenant can see exactly how much energy they are consuming. The tenant can also budget their own energy expenditure accordingly. The landlord gets paid in advance and need not worry about not being paid.

This system is well suited for any rented space such dormitories, classrooms, apartments, and market stalls.

Pay As You Go

Dormitory Tariff

The Pay As You Go Concept


There are two main components to our prepaid card system. The meter which is located near the power panels and the card reader which is installed in spaces occupied by people. The concept is simple, card is inserted, get power; card is removed, no more power.

  1. Insert card to get power, this is the basic user pays concept.
  2. While the card is inserted, amount is deducted from prepaid credits based on power consumed. The card reader displays the remaining credits. Once all the card credits is used up, the power is cut off.
  3. The card reader can toggle the display using a button between the remaining credits, the tariff rate ($ per watt) and the energy consumption (always in sync with the meter). When the remaining is low, a warning is given to the user.
Reusable Card

Once the card credits is used up or nearly used up, it can be recharged or topped up using a credit dispensing unit.

Tariff Rate

Tariff Rate
  1. Since the tariff rate is stored on the card itself. It would be possible to set different card rates for different users. For example, a classroom is used by the teacher during the day, so the card that the teacher has can have zero tariff rate or a favorable rate. While the same classroom may be rented out for use as a community classroom and a different card rate can be charged.
  2. When the utility changes their rate, the new rate need only to be updated on the credit dispensing unit. When a user comes to recharge their card, the new rate is automatically transferred to the card. There is no need for the operator to go to each installation and change the rate manually.

kWh Meter

  1. Model : Polaris
  2. Single-Phase, 3-Wire kWh Meter
  3. Rated Current : 200A
  4. External 200A current sensor
  5. External latching relay
  6. 6-digit LED display
  7. Displays kWh

Smart Card Reader

  1. Model : ICR815L
  2. Power supplied from meter
  3. 6-digit LED display
  4. Displays kWh of meter, credit and tariff rate stored on smart card credit
  5. Mounting: Wall mount

Credit Dispensing Unit

  1. Model ICP820W
  2. 16 characters by 2 lines dot matrix LCD
  3. Adding credits
  4. 0 to 9 numeric keyboard for easy operation
  5. Unit secured through combination of system card