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Discussion Starter · #1 ·
HI,

I am trying to determine the electrical costs of items in the house.

if someone could help me with the equation used, that would be great.

for instance the garage door opener is 120v and 6amps.

it takes 10 secs to open and 10 to close.

tks in advance


leewaytoo


ps. say you were re-wiring a home, what gauge wire would you use
from the svc panel, if price were not a concern, only concern is
to use less electricity?

tks again.
 

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Motor operating cost have many variables inrush, power factor during start up ect..

but for a 6 amp load at 120 VAC.

120X6=720 watts .720 kw

10 seconds is .00277 of an hour so at .09 cents a KWHR you have an extreme cost of .0001794 cents..
 

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Discussion Starter · #12 ·
tks for the replies

tks for the replies gents.

here in waterford michigan it is .04531 cents for power supply energy,
.04284 cents for distribution
total .08815 per kwhr

then there is the power supply surcharge of $4.52
and delivery surcharge of $2.57
and sales tax $1.90

so our usage was 457 kwh and the total bill was $49.28
for the month of august.

so with the extra stuff it comes to $00.107833 per kwhr.

natural gas is $00.974047 per ccf plus a $9 customer charge.
for august last, we used 6ccf for hot water, tankless works for me.

for natural gas heat and water this month of dec we/two have
used 96ccf's as of yesterday.

tks again for your replies.

leewaytoo
 

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Think I pay 7 pennies per Kw hr. That's about 3.8 cents. per Kw hour.The first 100 units are a bit more at 15 pennies for my workshop. More you use. Cheaper it is.

But for the home we are on a fixed rate for electricity and gas of £950 - 00 per year through one company - all you can use. That's appx $1800 a year.House has to be limited to a three bedroom type and not more than 3500 square feet of living space. Excludes areas such as car ports, entrance halls, lofts, wardrobes etc.

Frank
 

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Motor operating cost have many variables inrush, power factor during start up ect..

but for a 6 amp load at 120 VAC.

120X6=720 watts .720 kw

10 seconds is .00277 of an hour so at .09 cents a KWHR you have an extreme cost of .0001794 cents..
Brian,
I don't entirely understand.

I understand 120Vx6A=720 watts, divided by 1000=.720KW, and 10seconds is .00277 of an hour but the rest I don't follow.

Is 9 cents per KWHR = to using 1000watts for one hour? If so, how can .720KW = 9 cents?
 

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The basic equation to determine watts is voltage multiplied by amps. Most providers charge by the kilowatt/hour -- thousand watts per hour.

I don't know what you mean by your question about wire size. Service wire sizes are determined by service size (main breaker) which is determined by the load. The smallest branch circuit is generally 15 amps using #14 wire, then 20 amps using #12 wire, 30 amps using #10 wire and so on. Some jurisdictions require all residential wiring branch circuits be at least 20 amps.
 

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9 cents is .09 as a dollar is 1.00 and 9 cents is 9/100 of a dollar which makes 9 cents .09 mathematically. Now I am no math expert by any stretch of the imagination. So others can try and I will recalculate my calculations.
 
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