I worked out the total load of all my stuff at just under a Kwh which basically means a 400w 6-8 plant Hydro/Aero system breaks down per day @

400w HID 18/6 = $1.23
300w Main pump 15on 15off (12hours) = 61c
10w Circulating pump 15on 15off (12hours) = 2c
10w Air pump 24/7 = 4c
120w extractor fan 18/6 = 38c
38w circulating fan 24/7 = 16c
38w intake fan 24/7 = 16c

So thats $2.60 per day to run it all add in wastage factors of appliances at about 15percent and you have $2.96 per day 6r $20.72 a week or $331.52 for a 16 week grow.

So 1oz covers electricity costs if you were ever to sell! nice!