floridacity2004
Well-Known Member
DO ME A FAVOR AND DO THE MATH FOR 10 1000 WATT LIGHT SET UP AND TELL ME WHAT YOU GET I JUST CANT BELIEVE
THIS SHIT 10,000 X 24 X 31 = 7440000 KW
ANSWER / 1000 = 7440 WATTS
ANSWER X .046450 = 345.588 LIGHT BILL PRICE
And that's just the electricity savings. Since a good CFL lasts 10 times longer than an old-style bulb, that's a lot fewer bulbs to buy. This is especially important for large commercial applications, where the cost of labor to constantly replace old-style bulbs can be significant.
But there's yet more savings. Since CFL's run cooler than old-style bulbs, you'll spend less money to cool your home or office. (But don't think that this means you should use regular lights in winter; sure they create heat, but they do so inefficiently. When you need to add heat to your home, light bulbs are the most wasteful way to do it. Short answer, CFL's are best no matter what the season.)
To figure your electricity savings manually use this formula:
x Cost per kilowatt-hour = Total Cost
For example, let's say you replace ten 60-watt bulbs with ten 15-watt CFL bulbs. That saves you 45 watts per bulb, or 450 watts for all ten. Let's say all your lights were on for six hours a day, five days a week. That's thirty hours a week, or about 1500 hours a year. So your 450 watts savings times 1500 hours a year = 675,00 watt-hours. Divide by 1000 and you have 675 kilowatt-hours (kWh). If you're paying 15¢ per kilowatt-hour, then you'll save $101.25 a year.
Before we see how much electricity costs, we have to understand how it's measured. When you buy gas they charge you by the gallon. When you buy electricity they charge you by the kilowatt-hour (kWh). When you use 1000 watts for 1 hour, that's a kilowatt-hour. For example:
When the number is low we sometimes use watt-hours (Wh) instead of kWh. For example, we might say 500 watt-hours instead of 0.5 kWh.
Exercise #1. Go get your electricity bill and see how many kilowatt hours you used last month. Also see if it lists how much you're paying per kilowatt hour.
Exercise #2. Assume that the lights in your kitchen and living room together use 400 watts. How much does it cost if the lights are on 24 hours a day, for a whole month? How much per year? Assume 11¢/kWh. (see answer)
CHARGES
1 100 WATT SODIUM VAPOR
TAX
TOTAL CURRENT BILL DUE 11/15/08
PREVIOUS AMOUNT DUE
THANK YOU FOR YOUR PAYMENT 10/20/08
PREVIOUS UNPAID BALANCE
TOTAL AMOUNT DUE
0.046450
O
N
D
J
F
M
A
M
J
J
A
S
O
THIS SHIT 10,000 X 24 X 31 = 7440000 KW
ANSWER / 1000 = 7440 WATTS
ANSWER X .046450 = 345.588 LIGHT BILL PRICE
And that's just the electricity savings. Since a good CFL lasts 10 times longer than an old-style bulb, that's a lot fewer bulbs to buy. This is especially important for large commercial applications, where the cost of labor to constantly replace old-style bulbs can be significant.
But there's yet more savings. Since CFL's run cooler than old-style bulbs, you'll spend less money to cool your home or office. (But don't think that this means you should use regular lights in winter; sure they create heat, but they do so inefficiently. When you need to add heat to your home, light bulbs are the most wasteful way to do it. Short answer, CFL's are best no matter what the season.)
To figure your electricity savings manually use this formula:
Watts x Hours Used
1000
Before we see how much electricity costs, we have to understand how it's measured. When you buy gas they charge you by the gallon. When you buy electricity they charge you by the kilowatt-hour (kWh). When you use 1000 watts for 1 hour, that's a kilowatt-hour. For example:
Device wattage
Device
Hours used
kWh
1000 watts
medium window-unit AC
one hour
1 kWh
1500 watts
large window-unit AC
one hour
1.5 kWh
500 watts
small window-unit AC
one hour
0.5 kWh
24 watts
42" ceiling fan on low speed
ten hours
0.24 kWh
100 watts
light bulb
731 hours
(i.e., all month)
(i.e., all month)
73.1 kWh
Exercise #1. Go get your electricity bill and see how many kilowatt hours you used last month. Also see if it lists how much you're paying per kilowatt hour.
Exercise #2. Assume that the lights in your kitchen and living room together use 400 watts. How much does it cost if the lights are on 24 hours a day, for a whole month? How much per year? Assume 11¢/kWh. (see answer)
- 400 watts x 24 hours/day x 30.5 days/month = 292,800 Total Watt-hours
- 292,800 Wh / 1000 Wh = 293 kWh
- 293 kWh x 11¢/kWh = $32.23/mo.; $387/yr.
- 1440 watts x 24 hours/day x 30.5 days/monh = 1,054,080 Total Watt-hours
- 1,054,080 Wh / 1000 Wh = 1,054 kWh
- 1,054 kWh x 11¢/kWh = $116/mo.; $1392/yr.
ACCOUNT NUMBER
NAME
RATE
CLASS
TYPE
LOCATION NUMBER
METER NUMBER
1
1
0
SERVICE
FROM | TO
FROM | TO
NO.
DAYS
DAYS
READ
TYPE
TYPE
READING
PREVIOUS | PRESENT
PREVIOUS | PRESENT
METER
MULTIPLIER
MULTIPLIER
KWH
USAGE
USAGE
CHARGES
09/22/08
10/21/08
29
2
27903
28728
1
825
80
TOTAL CURRENT BILL DUE 11/15/08
PREVIOUS AMOUNT DUE
THANK YOU FOR YOUR PAYMENT 10/20/08
PREVIOUS UNPAID BALANCE
TOTAL AMOUNT DUE
103.95
6.50
6.85
117.30
193.32
-184.63
8.69
125.99
POWER COST ADJUSTMENT
TOTAL DUE NOW
$
125.99
COMPARISONS
DAYS SERVICE
TOTAL KWH
AVG. KWH/DAY
COST PER DAY
DISCOUNT DATE
11/15/08
BILL IS DELINQUENT AFTER DISCOUNT DATE
CURRENT BILLING PERIOD
0
0
0
0
PREVIOUS BILLING PERIOD
0
0
0
0
AFTER DISCOUNT DATE PAY
$
131.51
SAME PERIOD LAST YEAR
0
0
0
0
Your Electricity Use Over The Last 13 Months
10
7
3
0
7
3
0
O
N
D
J
F
M
A
M
J
J
A
S
O
BILLS ARE PAYABLE UPON RECEIPT. PAYMENTS RECEIVED AFTER DISCOUNT DATE ARE SUBJECT TO A 5% LATE CHARGE.
IF BILL IS NOT PAID WITHIN 5 DAYS AFTER DUE DATE, SERVICE MAY BE DISCONTINUED WITHOUT FURTHER NOTICE.
IF BILL IS NOT PAID WITHIN 5 DAYS AFTER DUE DATE, SERVICE MAY BE DISCONTINUED WITHOUT FURTHER NOTICE.
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TYPE BILL
0 Regular Bill
5 Prorated
1 Estimated
6 Prorated Minimum
2 Minimum Estimated
7 Levelized Bill
3 Minimum
8 Contracts/Weatherization
4 Final Bill
0 Regular Bill
5 Prorated
1 Estimated
6 Prorated Minimum
2 Minimum Estimated
7 Levelized Bill
3 Minimum
8 Contracts/Weatherization
4 Final Bill
ABBREVIATIONS
KWH
Kilowatt-Hours
KW DEMAND
Kilowatt Demand
(-)
Denotes Credit or Overpayment
KWH
Kilowatt-Hours
KW DEMAND
Kilowatt Demand
(-)
Denotes Credit or Overpayment
