Electricity Bill: British Gas Click Energy 5

First 122 Units @ 22.086p

Following Units @ 10.151p

My “server” (HP DC 7100 – 2 x Sata HDD):

Average Power Consumption: ~80W (~60W when idle, 90W both disks spinning, 80W normal)

Run Time 1764:34 Hours = 73.52 Days

Consumption: 139KWh

Daily Consumption = 139 / 73.52 = 1.89KWh

Monthly Consumption (30 days) = 73.52 / 30 = 2.450666, so 139 / 2.450666 = 56.72KWh

Therefore the cost at 10.151p / unit for a month = £5.76

Cisco PIX 501

Average Power Consumption: 12.6W (very stable)

Current Draw: 0.5A

Consumption = 0.25KWH/24 hours

Monthly (30 days) = 0.25 * 30 = 7.5KWH

Therefore cost at 10.151p = 7.5*10.151 = £0.76

3COM OfficeConnect Wireless Router

Average Power Consumption: 15W (very stable)

Current Draw: 0.7A

Consumption = 0.39KWH/24 hours

Monthly (30 days) = 0.39 * 30 = 11.7KWH

Therefore cost at 10.151p = 7.5*10.151 = £1.19

New Server – SheevaPlug Multi + eSATA Disk

Average Power Consumption: ?

Current Draw: ~22W

Consumption = 0.475KWH/24 hours

Monthly (30 days) = 0.475 * 30 =14.3 KWH

Therefore cost at 10.151p = 14.3*10.151 = £1.45

PS3 Playstation

Standby current draw: 10.1W

Consumption = 0.47KWH/24H

Monthly (30 days) = 0.47 * 30 =14.11 KWH

Therefore cost at 10.151p =14.1 * 10.151 = £1.43

Media PC (HP/Compaq Evo Something)

Standby current draw: 22W

Consumption = 0.24KWH/11 hours = 0.52KWH/24H

Monthly (30 days) = 0.52 * 30 =15.71 KWH

Therefore cost at 10.151p = 15.71*10.151 = £1.59