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Old 12-07-2006, 02:04 AM
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All you need to do is download the spreadsheet and enter a few bits of info.

How it works

 To calculate your cost per month you will need a copy of your last few power bills, and this spread sheet. If you just want to estimate and know how your power billing works just check out the pic.

First you need to find out how much your power company charges you and how much you allready use. Take your power bills out to do this.
There are three things you will need Total Usage, a Baseline power allotment (this is important as you go over this Base the price per kWh will increase), and the Pricing.

Next find your setup, or enter your own on the Lights sheet.

Lastly enter your info. Start with info from your bills.
Previous Usage cells, enter your Total Usage from your last 3 bills.
Baseline, find and fill in you baseline power allotment.
Pricing, Dont worry if all the entrys arn't on your bill, they usualy increase by $0.05, just fill them ALL in.
Your Lights,enter the number you looked up on the Lights sheet.

On to Version 2. Let me start by adding this post
Quote:
Originally Posted by babygro View Post
Ohms law is relatively straight forward and can be used to calculate an accurate figure of wattage useage from any light system, and this would probably have been a better way to go. To calculate total wattage used from a ballast HID system you need to use the amperage figure not the bulb wattage figure. To show you how your figures are inacurate, OHMS Law is Volts x Amperes = Watts, so if we know two of those figures we can calculate the third.

The real wattage of a 400w HID system is Volts x Amperes or 120 x 3.8 = 456watts for an average 400w system others would be -

250w 120 x 2.5 = 300w
400w 120 x 3.8 = 456w
600w 120 x 5.7 = 684w
1000w 120 x 9.5 = 1140
By using the new Ohm's Law section you will be able to get even more exact with your estimate. I recomend useing this section to get your actual watt usage. As pointed out by babygro and A Good Keen Man useing only bulb comsumption and not power loss in the ballast will throw your results by up to 15%. By useing Ohms Law i think it will be more around 5% Give or Take so I added a range of costs derived from -5% to +5% less or more KWh usage.

98% of electronic equipment will have its Amps posted on it somewhere. As for your voltage just about everyone should know their local voltage but it is usualy posted to.


Refferances:
GCSE Physics: kilowatt-hour <---How to do the math yourself.
Electric Bill Detail - PG&E Bill <---Sample Bill.
download: Download Central <---Free Open Office

Well I hope this is informative and helps you find your right setup for your homes Power Base. To unlock document toke.
Attached Files
File Type: zip Power Usage V2.zip (7.3 KB, 1444 views)
File Type: zip Power Usage V2_01.zip (7.9 KB, 718 views)
Last edited by -=4:20=-Guy; 02-10-2007 at 07:36 PM.. Reason: V2_01
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Old 12-07-2006, 02:15 AM
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Great find! Maybe GK will sticky?
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Old 12-07-2006, 02:17 AM
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I did it all by myself and that would be awsome!
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Old 12-07-2006, 06:41 AM
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i looked it up, man! i need to switch electric company for 30 days 16h per day it will cost me £80.00 i think , if i have done it right.
I havent got an electricity bill as it is a prepaid meter when the cash runs out it goes off. but i do know its more than double what i normally use.
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Old 12-07-2006, 08:31 AM
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very NICE!!!

I am working on it..

cheers!!!
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Old 12-08-2006, 01:31 AM
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Why not ask the real moderator?
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Old 12-08-2006, 02:55 AM
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Quote:
Originally Posted by potroast View Post
Why not ask the real moderator?
Ohh.. You dirty dog. lol. Maybe if you see one you can let them know. hehehe.
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Old 12-08-2006, 09:33 AM
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Hey mr. roast... is the indoor section your?


AND

What have you done with our KING?

iloveyou
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Old 12-10-2006, 10:08 PM
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Hey 420 guy...

Your post is a fantastic contribution to the site. It will eventually be moved into the FAQ section.....

cheers
GK
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Old 12-27-2006, 10:41 PM
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Thought all of you might also find this Kill A Watt meter interesting!
http://www.bghydro.com/BGH/Itemdesc.asp?ic=MKAW&eq=&Tp=
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