how to calculate the cost of your grow made simple!!!

step 1...amps x volts = watts

step 2...watts/1000 = kilowatts or kw

step 3...hours used in month

step 4...kilowatts x hours used = kilowatt hours or kwh

step 5...electricity price ( in pence per kwh ) this should be found at the bottom of your bill i pay 15p can be used as an average

step 6...kwh x electricity price = cost in pence to run item for 1 month

step 7...divide by 100 to get cost in £ to run item for 1 month

step 8... x by number of items you are using

example...based on a 250w hps on a 18/6 schedule for 1 month where cost of electricity is 15p (this is expensive yours is probs less)

step 2...250/1000 = 0.25

step 3...540

step 4...0.25x540 = 135

step 5...15p

step 6...135x15 = 2025

step 7...2025/100 = £20.25

step 8...x how ever many lights you have

in this case there is only one 250w hps so the cost to run it for one month is roughly £20.25p hope this is helpful to someone peace out and happy toking

http://www.hydroponics.net/learn/hid_lamp_op_cost.asp

This does the same thing. Just makes it a little easier.

except its all id dollars but that can be converted.

Ill use your method to calculate my AC usage but theres probably even another site that has that haha.

the more the merrier as they say