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#1
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Cost to Run 12 volt Exterior Lighting
I use three, 300 watt 12 volt Maulibu type transformers to light my
yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx |
#2
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Cost to Run 12 volt Exterior Lighting
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#3
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Cost to Run 12 volt Exterior Lighting
wrote in message ... I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx It will actually cost around 20% more for the 12 volt lights using the same wattage. This is due to the loss in the transfromer and to a very slight aditional loss in the 12 volt wires. Electricity is sold in kilowatt hours. To determin this you take the wattage of the bulbs (if that is not known, you take the voltage and multiply it by the current) and multiply it by the number of hours the bulbs are on. This is watt hours. Then devide by 1000 for the kilowatt hours (KWH). For the 12 volt system, you have to add about 20% due to the aditional losses. |
#4
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Cost to Run 12 volt Exterior Lighting
Watts is watts regardless of voltage. Just add the wattage of all your
bulbs and calculate as you would in the house. The reason fancified outdoor lighting is lo voltage and not 'line' voltage is because it's safer since the lines are rarely buried very deep and there's also a much wider variety of fixtures and bulbs in lo voltage. s wrote in message ... I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx |
#5
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 9:30*am, wrote:
I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx They dont use less than comparable wattage 120v lights, probably more since the transformer wastes energy through heat loss and the 12v lights may not be as efficient as 120v bulbs. 760 w would cost me maybe 36$ a month run 12 hrs a day, you have the number 760 watt figure hours used x your eletic rate, a Kill-a-Watt meter is good. |
#7
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Cost to Run 12 volt Exterior Lighting
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#8
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 10:05*am, Terry wrote:
On Sun, 27 Jan 2008 07:30:36 -0800 (PST), wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx 12V lights are cheaper to "install" than standard 120V lights because of the cheaper materials involved. 300 x 3 = almost a kilowatt. *The average cost per kilowatt, last time I checked, was close to a dime. *So you pay about a dime an hour to run your 3 lights. How did you come to the conclusion that one of your lights is only drawing 160W? *If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. he said his transformers were using near 760 w, a dime-10c for electric, many pay .15-.18c per Kw, few pay 10c |
#9
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Cost to Run 12 volt Exterior Lighting
Ralph Mowery wrote:
"Smitty Two" wrote in message news In article , wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx A watt is a watt. It doesn't matter whether it's 12 volts or 120 volts. Since a watt is a volt times an amp, the low voltage bulb will draw 10 times as much current as the 120 volt bulb of the same wattage. For cost to operate, all you have to consider is watt-hours. While a watt is a watt with lights, the 12 volt system will cost about 20% more to run if the same wattage of bulbs is used. This is because of the transformer loss and a small aditional loss in the 12 volt wiring compaired to the 120 volt wiring.. The 12 volt system is used mainly due to the safety factor. If a dog chews into the 12 volt system, he will receive a small charge and not be harmed where the 120 volt system will probably kill. You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. |
#10
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Cost to Run 12 volt Exterior Lighting
he was referring to the transformers, not the lights themselves. Obviously
you would not have a single 300w light on lo voltage. s "Terry" wrote in message ... How did you come to the conclusion that one of your lights is only drawing 160W? If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. |
#11
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Cost to Run 12 volt Exterior Lighting
On Sun, 27 Jan 2008 08:13:03 -0800 (PST), ransley
wrote: On Jan 27, 10:05*am, Terry wrote: On Sun, 27 Jan 2008 07:30:36 -0800 (PST), wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx 12V lights are cheaper to "install" than standard 120V lights because of the cheaper materials involved. 300 x 3 = almost a kilowatt. *The average cost per kilowatt, last time I checked, was close to a dime. *So you pay about a dime an hour to run your 3 lights. How did you come to the conclusion that one of your lights is only drawing 160W? *If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. he said his transformers were using near 760 w, a dime-10c for electric, many pay .15-.18c per Kw, few pay 10c I live in Georgia. It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site. |
#12
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 10:18*am, "Pete C." wrote:
Ralph Mowery wrote: "Smitty Two" wrote in message news In article , wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx A watt is a watt. It doesn't matter whether it's 12 volts or 120 volts.. Since a watt is a volt times an amp, the low voltage bulb will draw 10 times as much current as the 120 volt bulb of the same wattage. For cost to operate, all you have to consider is watt-hours. While a watt is a watt with lights, the 12 volt system will cost about 20% more to run if the same wattage of bulbs is used. *This is because of the transformer loss and a small aditional loss in the 12 volt wiring compaired to the 120 volt wiring.. The 12 volt system is used mainly due to the safety factor. *If a dog chews into the 12 volt system, he will receive a small charge and not be harmed where the 120 volt system will probably kill. You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting.- Hide quoted text - - Show quoted text - There is light bulb efficency, 100 watt incandesant 120v are around 17-19 Lumen per watt, 4 w 120v can be near 10 LPW then there is the rating for 12v which per watt could easily make 12v, 20%+ less efficent. |
#13
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 10:21 am, Terry wrote:
On Sun, 27 Jan 2008 08:13:03 -0800 (PST), ransley wrote: On Jan 27, 10:05 am, Terry wrote: On Sun, 27 Jan 2008 07:30:36 -0800 (PST), wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx 12V lights are cheaper to "install" than standard 120V lights because of the cheaper materials involved. 300 x 3 = almost a kilowatt. The average cost per kilowatt, last time I checked, was close to a dime. So you pay about a dime an hour to run your 3 lights. How did you come to the conclusion that one of your lights is only drawing 160W? If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. he said his transformers were using near 760 w, a dime-10c for electric, many pay .15-.18c per Kw, few pay 10c I live in Georgia. It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site. Your chart seems to show that a dime is really close to average, everywhere but the New England and Mid-Atlantic states, and California. JK |
#14
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Cost to Run 12 volt Exterior Lighting
"Pete C." wrote in message ... Ralph Mowery wrote: You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. While good quality transformers will be about 98% efficiant, the comsumer grade stuff (especially the inported junk) will loose much more. Quote from one source: TRANSFORMER LOSSES Practical power transformers, although highly efficient, are not perfect devices. Small power transformers used in electrical equipment have an 80 to 90 percent efficiency range, while large, commercial powerline transformers may have efficiencies exceeding 98 percent. |
#15
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 10:44*am, Big_Jake wrote:
On Jan 27, 10:21 am, Terry wrote: On Sun, 27 Jan 2008 08:13:03 -0800 (PST), ransley wrote: On Jan 27, 10:05 am, Terry wrote: On Sun, 27 Jan 2008 07:30:36 -0800 (PST), wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx 12V lights are cheaper to "install" than standard 120V lights because of the cheaper materials involved. 300 x 3 = almost a kilowatt. *The average cost per kilowatt, last time I checked, was close to a dime. *So you pay about a dime an hour to run your 3 lights. How did you come to the conclusion that one of your lights is only drawing 160W? *If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. he said his transformers were using near 760 w, a dime-10c for electric, many pay .15-.18c per Kw, few pay 10c I live in Georgia. *It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site. Your chart seems to show that a dime is really close to average, everywhere but the New England and Mid-Atlantic states, and California. JK- Hide quoted text - - Show quoted text - That chart is not the truth after all taxes, no matter what it says. For Illinois and Indiana its both about .125 Kwh, It was even higher this year in Chicago area nearing 0.14c Kwh. Check your bill to see if it agrees. |
#16
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Cost to Run 12 volt Exterior Lighting
In article
, ransley wrote: On Jan 27, 10:18*am, "Pete C." wrote: Ralph Mowery wrote: "Smitty Two" wrote in message news In article , wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx A watt is a watt. It doesn't matter whether it's 12 volts or 120 volts. Since a watt is a volt times an amp, the low voltage bulb will draw 10 times as much current as the 120 volt bulb of the same wattage. For cost to operate, all you have to consider is watt-hours. While a watt is a watt with lights, the 12 volt system will cost about 20% more to run if the same wattage of bulbs is used. *This is because of the transformer loss and a small aditional loss in the 12 volt wiring compaired to the 120 volt wiring.. The 12 volt system is used mainly due to the safety factor. *If a dog chews into the 12 volt system, he will receive a small charge and not be harmed where the 120 volt system will probably kill. You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting.- Hide quoted text - - Show quoted text - There is light bulb efficency, 100 watt incandesant 120v are around 17-19 Lumen per watt, 4 w 120v can be near 10 LPW then there is the rating for 12v which per watt could easily make 12v, 20%+ less efficent. Well, we aren't talking about lumens. I don't think the OP is looking out at his rhododendrons and thinking, ****, that damn light doesn't look like it's putting out an honest quantity of lumens. He's talking about watts, and the cost to operate those watts. |
#17
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Cost to Run 12 volt Exterior Lighting
On Sun, 27 Jan 2008 07:30:36 -0800 (PST),
wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx Try this: http://the-gadgeteer.com/review/kill...monitor_review |
#18
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Cost to Run 12 volt Exterior Lighting
In article
, ransley wrote: On Jan 27, 11:26*am, Smitty Two wrote: In article , *ransley Mark wrote: On Jan 27, 10:18*am, "Pete C." wrote: Ralph Mowery wrote: "Smitty Two" wrote in message news In article , wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. *I don't think it will matter, but one of them is only drawing about 160 watts. *Each of the others is near their 300 watt limit. Thx A watt is a watt. It doesn't matter whether it's 12 volts or 120 volts. Since a watt is a volt times an amp, the low voltage bulb will draw 10 times as much current as the 120 volt bulb of the same wattage. For cost to operate, all you have to consider is watt-hours. While a watt is a watt with lights, the 12 volt system will cost about 20% more to run if the same wattage of bulbs is used. *This is because of the transformer loss and a small aditional loss in the 12 volt wiring compaired to the 120 volt wiring.. The 12 volt system is used mainly due to the safety factor. *If a dog chews into the 12 volt system, he will receive a small charge and not be harmed where the 120 volt system will probably kill. You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting.- Hide quoted text - - Show quoted text - There is light bulb efficency, 100 watt incandesant 120v are around 17-19 Lumen per watt, 4 w 120v can be near 10 LPW then there is the rating for 12v which per watt could easily make 12v, 20%+ less efficent. Well, we aren't talking about lumens. I don't think the OP is looking out at his rhododendrons and thinking, ****, that damn light doesn't look like it's putting out an honest quantity of lumens. He's talking about watts, and the cost to operate those watts.- Hide quoted text - - Show quoted text - The OP said he was under the impression 12v is cheaper to run, LPW is what lighting is all about. Nobody has even thought that those 12v lights are less efficient in the equation. . Lumens per watt may be what *interior* lighting is all about, and even a lot of *outdoor* lighting like football stadiums. As far as lighting up a path or a flower, it's just mood lighting. I've never heard of anyone taking LPW efficiency into consideration with landscape lighting, and I doubt the OP cares about that, either. I think he may have just been under the mistaken impression that a watt-hour of 12 volt stuff was cheaper than a watt-hour of 120 volt stuff. Lumens may be an interesting ancillary consideration from a theoretical perspective, but it's irrelevant to the OP's considerations. |
#19
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Cost to Run 12 volt Exterior Lighting
Ralph Mowery wrote:
"Pete C." wrote in message ... Ralph Mowery wrote: You've got your decimal point in the wrong place. Transformer and wiring losses will be more like 2%, not 20%. As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. While good quality transformers will be about 98% efficiant, the comsumer grade stuff (especially the inported junk) will loose much more. Quote from one source: TRANSFORMER LOSSES Practical power transformers, although highly efficient, are not perfect devices. Small power transformers used in electrical equipment have an 80 to 90 percent efficiency range, while large, commercial powerline transformers may have efficiencies exceeding 98 percent. So skip the junk import transformers and use a single quality US transformer. |
#20
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Cost to Run 12 volt Exterior Lighting
On Sun, 27 Jan 2008 16:18:03 GMT, "Pete C."
wrote: [snip] As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. And how does God like the smell of all those burning dog corpses? :-) |
#21
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Cost to Run 12 volt Exterior Lighting
10-4 on that! And leave 'em a pan of antifreeze to refresh with.
s "Pete C." wrote in message ... As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. |
#22
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Cost to Run 12 volt Exterior Lighting
Yeah well that chart has kansas at 8 cents. Must be about a decade old.
You'd better chek your bill Kansas is paying 13+ cents. Your utility company has to post the rates. s "Terry" wrote in message ... I live in Georgia. It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site. |
#23
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Cost to Run 12 volt Exterior Lighting
If you have to worry about what your yuppified lo voltage lighting is
costing to run, then you need to turn it off and not have it. you can't afford it. s "ransley" wrote in message ... The OP said he was under the impression 12v is cheaper to run, LPW is what lighting is all about. Nobody has even thought that those 12v lights are less efficient in the equation. . |
#24
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Cost to Run 12 volt Exterior Lighting
He doesn't like them either. That's why he made them lick their own butts,
and eat poop. s "Harry" wrote in message ... On Sun, 27 Jan 2008 16:18:03 GMT, "Pete C." wrote: [snip] As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. And how does God like the smell of all those burning dog corpses? :-) |
#25
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Cost to Run 12 volt Exterior Lighting
Harry wrote:
On Sun, 27 Jan 2008 16:18:03 GMT, "Pete C." wrote: [snip] As for not electrocuting some filthy dog crapping on my lawn, digging in my landscaping and chewing my wiring, I'm not sure low voltage is a good thing. I'm thinking I should upgrade to 480V landscape lighting. And how does God like the smell of all those burning dog corpses? :-) If God exists, and cares, she can keep them off the lawn. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#26
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 11:07 am, ransley wrote:
On Jan 27, 10:44 am, Big_Jake wrote: On Jan 27, 10:21 am, Terry wrote: On Sun, 27 Jan 2008 08:13:03 -0800 (PST), ransley wrote: On Jan 27, 10:05 am, Terry wrote: On Sun, 27 Jan 2008 07:30:36 -0800 (PST), wrote: I use three, 300 watt 12 volt Maulibu type transformers to light my yard and walkway lights around my home. I was under the impression the reason one would use 12volt instead of line voltage was the 12v was less costly to run. How do I determine how much power each of these is drawing (per hr?) so I calculate my cost per month. I don't think it will matter, but one of them is only drawing about 160 watts. Each of the others is near their 300 watt limit. Thx 12V lights are cheaper to "install" than standard 120V lights because of the cheaper materials involved. 300 x 3 = almost a kilowatt. The average cost per kilowatt, last time I checked, was close to a dime. So you pay about a dime an hour to run your 3 lights. How did you come to the conclusion that one of your lights is only drawing 160W? If you have a 300W lamp in the fixture and are only getting 160W then something is wrong. he said his transformers were using near 760 w, a dime-10c for electric, many pay .15-.18c per Kw, few pay 10c I live in Georgia. It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site. Your chart seems to show that a dime is really close to average, everywhere but the New England and Mid-Atlantic states, and California. JK- Hide quoted text - - Show quoted text - That chart is not the truth after all taxes, no matter what it says. For Illinois and Indiana its both about .125 Kwh, It was even higher this year in Chicago area nearing 0.14c Kwh. Check your bill to see if it agrees. Mine is actually cheaper than the chart. I am in WI, and my rate is $. 0099880 per kWh, plus a meter charge of $.22 per day. JK |
#27
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Cost to Run 12 volt Exterior Lighting
On Jan 27, 6:34*pm, "S. Barker" wrote:
Yeah well that chart has kansas at 8 cents. *Must be about a decade old. You'd better chek your bill Kansas is paying 13+ cents. *Your utility company has to post the rates. s "Terry" wrote in message ... I live in Georgia. *It is still a dime, but I see now that is well below average. http://www.eia.doe.gov/cneaf/electri...able5_6_a.html Btw I could not find this information at my local utility company's web site.- Hide quoted text - - Show quoted text - That inacurate chart does say 07 |
#28
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Cost to Run 12 volt Exterior Lighting
So you're trying to tell us you're not even paying one cent per kwh?
You'd better look again. s "Big_Jake" wrote in message ... Mine is actually cheaper than the chart. I am in WI, and my rate is $. 0099880 per kWh, plus a meter charge of $.22 per day. JK |
#29
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Cost to Run 12 volt Exterior Lighting
On Jan 28, 10:58*am, "S. Barker" wrote:
So you're trying to tell us you're not even paying one cent per kwh? You'd better look again. s "Big_Jake" wrote in message ... Mine is actually cheaper than the chart. *I am in WI, and my rate is $.. 0099880 per kWh, plus a meter charge of $.22 per day. JK- Hide quoted text - - Show quoted text - And he doesnt think the 6.60 a month should be considered in his price of kwh cost |
#30
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Cost to Run 12 volt Exterior Lighting
ransley wrote:
On Jan 28, 10:58 am, "S. Barker" wrote: So you're trying to tell us you're not even paying one cent per kwh? You'd better look again. s "Big_Jake" wrote in message ... Mine is actually cheaper than the chart. I am in WI, and my rate is $. 0099880 per kWh, plus a meter charge of $.22 per day. JK- Hide quoted text - - Show quoted text - And he doesnt think the 6.60 a month should be considered in his price of kwh cost Well, $0.0099.../kWh would be 9.9 mills or roughly 10 cents, not less than 1 by my counting decimal places... -- |
#31
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Cost to Run 12 volt Exterior Lighting
Obviously, you don't understand decimal places. A DIME would be .10 so a
bit under a time would be .099blahblahblah. your example of$0.0099 is ALMOST a penny s "dpb" wrote in message ... Well, $0.0099.../kWh would be 9.9 mills or roughly 10 cents, not less than 1 by my counting decimal places... -- |
#32
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Cost to Run 12 volt Exterior Lighting
On Jan 28, 11:13 am, ransley wrote:
On Jan 28, 10:58 am, "S. Barker" wrote: So you're trying to tell us you're not even paying one cent per kwh? You'd better look again. s "Big_Jake" wrote in message ... Mine is actually cheaper than the chart. I am in WI, and my rate is $. 0099880 per kWh, plus a meter charge of $.22 per day. JK- Hide quoted text - - Show quoted text - And he doesnt think the 6.60 a month should be considered in his price of kwh cost I adds a 6/10th's of a cent to my cost per kWh JK |
#33
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Cost to Run 12 volt Exterior Lighting
According to Ralph Mowery :
While a watt is a watt with lights, the 12 volt system will cost about 20% more to run if the same wattage of bulbs is used. This is because of the transformer loss and a small aditional loss in the 12 volt wiring compaired to the 120 volt wiring.. True, however, outdoor LV systems are generally not operated with the same intent as indoor. You're not trying to achieve the same lighting level, they're often just markers or just intended to be enough light to avoid tripping over things. As a result, most systems don't really use that much wattage. A lot of installations are just short strings of 4W bulbs. The 12 volt system is used mainly due to the safety factor. And simplicity of installation. As far as "economy" goes - halogens will give you slightly more lumens per watt, but not likely to be useful in reducing power. It's better to be more modest in lighting requirement and simply reduce wattage or the number of bulbs. Or, if you have money to spare, go with LED bulbs. _Vastly_ more efficient than even fluorescents. There's some really neat new bulbs becoming available. Eg: 50W-equivalent LED bulbs in GU-10 or MR16 bases that draw only 2W of power, and undoubtably some that would fit just fine into traditional pea-bulb LV lighting systems like Malibus. Unfortunately, the prices are still heart-stopping... [IIRC, 12V 50W-equivalent MR16 LED floods drawing about 2W of power are over $50 _each_. Theoretically very long lived however - 50,000 hours and up. As long as nothing bad happened, it probably still would be a good investment in terms of power savings. But the startup costs are enormous.] -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. |
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