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Power Consumption and Light Costs
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 links.
First you need to find out how much your power company charges you and how
much you already 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, Don’t worry if all the entrees aren’t on your bill,
they usually 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:
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Ohms law is relatively straight forward and can be used to calculate
an accurate figure of wattage usage 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
inaccurate, 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 recommend using this section to get your actual watt usage.
As pointed out by folks using only bulb consumption and not power loss in
the ballast will throw your results by up to 15%. By using 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 usually posted to.
Download
Spreadsheet Here: Power Usage V2_0
References:
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.
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Stoney
Girl