Plug-in Energy Monitor

By: Ccg Imports  05/12/2011

Case Study 1:
Byrne Insurance is open from 8am to 6pm Monday to Friday. During the evenings between 6pm to 11pm they are charged on a day-time tariff(.16c/kWh) by their electricity supplier. Between 11pm and 8am they are charged on a night time tariff (.075c/kWh). 5 hours on day time tariff and 9 hours on night time tariff.

Each workstation has the following items which are left plugged in during the above times when the office is closed. The Wattage is the electricity usage if the items were left switched on:


PC

- 130 Watts


Monitor

- 150 Watts


Printer

- 200 Watts


Phone charger

- 20 Watts


Total Usage per Workstation:

0.500 Kilowatts

Results:

Day time: 0.500 Kw x 5 hours x 365 days x .16c/kWh

= €146

Night time: 0.500 Kw x 9 hours x 365 days x .075c/kWh

= €123
Total Cost

if all the items above were left switched on

= €269

per year per workstation.

Solution:

Case Study 2:
Speedy Couriers is open from 7.30am to 5.30pm Monday to Friday. They are on a general purpose tariff (.16c/kWh) with their supplier.14 hours on ageneral purpose tariff.Each workstation has the following items which are left plugged in during the above times when the office is closed. The Wattage is the electricity usage if the items were left switched on:
PC - 130 Watts
Monitor - 150 Watts
Printer- 200 Watts
Phone charger - 20 Watts
Total Usage per Workstation: 0.500 Kilowatts Results:
Daytime 0.500 Kw x 14 hours x 365 days .16c/kWh = €408
Total Cost if all left switched on as above €408 per year.

Solution:

The information in this article was current at 02 Dec 2011