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the-pi-guy said:

http://michaelbluejay.com/electricity/cost.html

Just use that.

Assuming 8 hours a day, at ~340 W, at 16 cents an hour.
It'll cost about 13.44$ a month, or 161$ a year.

 

 

Maybe this'll be better for you.

https://www.ukpower.co.uk/tools/running_costs_electricity

Thankyou you've been a great help. The extra cost is minimal, I will definately get the pro.