Measuring power consumption

stuarta99

Apologies if this isn't the correct forum.

Without a smart meter I'm trying to work out the cost of consumption such as having my TV on standby.

My manual says it's 0.3w and if I use this website for 8460 hrs in a year it tells me it would be £71 https://www.sust-it.net/energy-calculator.php

However this site says that 1.3w would be £11 or 3.2p/day https://metro.co.uk/2022/04/01/how-much-does-it-cost-to-leave-your-tv-on-standby-all-the-time-16387670/

I'm not sure what's the best way to work it out.

Benny2020

Every single figure quoted is wrong including the number of hours in a year.
0.3w is less than £3 a year.

stuarta99

So the first website I used 0.3w and 8760hrs which works out per year?

stuarta99

Ok it's been a long day, just realised it says 73.58p for a year

Reed_Richards

An average year (365.25 days) has 8766 hours.  For the sake of an estimate let's approximate that to 10,000 hours

Something that uses 0.3 W for 10,000 hours uses 3000 Wh or 3 kWh.

A kWh of electricity costs roughly 30p at present.  So running your 0.3 W device for over a year would cost you about 90p, less than £1.

markin

I got 75p for a full 8760 hrs,  And this site agrees https://www.omnicalculator.com/everyday-life/electricity-cost

Power consumed 2.6 kWh

1.3w = 11.3kWh = £3.30