Lighted end shows power is on and cord is ready to use. 15 Amps, 125 Volts, 1875 Watts. Limited lifetime warranty. Southwire 50-ft 12 / 3-Prong Outdoor Sjtw Heavy Duty Lighted Extension Cord | 2548SWUSA1LREC
Product SKU:
5013205085_5013205085
UPC:
32886296253
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I'm an electrical engineer. My advice is neither wrong, nor dangerous, but you did misread it. If he is charging a 12V battery and delivering 40A to the battery, the absolute maximum POWER that is being delivered to the battery is about 600 watts. The battery charger itself is not 100% efficient, if we assume it's 50% efficient worst case (and that strikes me as particularly bad) then the maximum instantaneous dissipation is 1200W (half in the charger, and half delivered to the battery). This assumes 100% of the power is coming from the wall, which may not be the case, since the 40A is in "starter mode", and likely had stored some energy in the charger.
So the question is how much current will be pulled through the extension cord. If you dissipate 1200W at 120V, that's 10 amps going through the extension cord (assuming a power factor of 1, I hope this is mostly reasonable), which gives you pretty good margin on the15A limit. It's also worth pointing out that "starting mode" means inherently that you aren't running it for more than a few seconds. If 12 gauge wire is rated for 15A , that almost certainly means continuously (12 gauge NM Romex would typically be rated for 20A continuous)... So, even if you exceeded 15A for a few seconds, it's a non-issue since heat takes a while to build up. It's pretty common for 120V welders to exceed 15A when the arc is first being struck, and it generally doesn't matter, the breakers don't even notice. In other words, there's a huge amount of margin.
What's more, most 120V single phase house wiring in the US is 12 or 14 gauge which is rated for 20A or 15A respectively, and tied to a 20A or 15A breaker respectively. So, it'd be really odd to manufacture a battery charger that exceeds 15A over more than a second or two since many breakers would be unhappy with it.
I have had this exact 100' cord for 3 1/2 years for electric lawn equipment. It has started to split in a few places where the inner wires (coated) have begun to stick out of the main covering. I continue to use it but was looking for a replacement.
I used to roll it up on a wheel but learned that wasn't a good way to store it and have use the recommended way for the last 1 plus years. Hoping that this recommended way keeps the next cord in better shape longer.
No idea what the quality is, but if you can find one at this price, it's a great deal!
Couple years ago, after moving to the Buffalo area, I picked up an electric snow blower, along with a 100 foot 12/3 extension cord. The cord ran me ~$50. Figure the inflation we're seeing these days, and I'd consider the price of this deal to be 50% of what it could be!
I found the 50' at a Lowes about an hour from me, but if I try to ship, the prices suddenly triple.
Also found them at a HD for a good price and the same thing happened. Isn't there some method to keep the store price when having items shipped to you ?
I thought you can get 2 of these 12/3 50' cords at Costco for $49 or less everyday. This link shows it is out of stock, but they are available in the stores: https://www.costco.com/outdoor-50...07236.html
Last edited by markng25 January 5, 2023 at 04:16 PM.
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I thought you can get 2 of these 12/3 50' cords at Costco for $49 or less everyday. This link shows it is out of stock, but they are available in the stores: https://www.costco.com/outdoor-50...07236.html
Give them a break… they're restless and haven't seen a deal in years
Ordered the 25 and 50 expecting to be cancelled. But got an email that they are ready for pickup. They couldn't find them when I was in store ???. This is Bloomfield Ct. wonder if they found the stash of 100 footers.
Nope...not as of an hour ago 🤣
They said there was 28 of them "somewhere" in the store.
40A at 15V is probably less than 11A at 120V, so yes, absolutely.
Why are you giving advice which is straight forward dangerous? The gauge of the wire is designed for current rating NOT power rating, so you can send higher than 120 voltage as long as it's below rated of insulation (could be up to 600V I think or 300V they will mark that on the wire itself) BUT you can NOT send higher than rated current since the wire will become heating element as higher current than what 12GA thickness of copper can handle goes through it and meets the internal resistance of the wire. There are different materials wire can be made so it handles higher than pure copper current but in this case if it's rated to 15A then stick to that as constant max, as far as short instance it should handle around 20A but I wouldn't run it at that rating for long.
For simple example imagine sending 20 people through tunnel that can only fit 15 wide and ask them how they feel about it.
I thought you can get 2 of these 12/3 50' cords at Costco for $49 or less everyday. This link shows it is out of stock, but they are available in the stores: https://www.costco.com/outdoor-50...07236.html
Yes probably about the same, but I'm less tempted because that one doesn't have 150+ TU 🤣
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Why are you giving advice which is straight forward dangerous? The gauge of the wire is designed for current rating NOT power rating, so you can send higher than 120 voltage as long as it's below rated of insulation (could be up to 600V I think or 300V they will mark that on the wire itself) BUT you can NOT send higher than rated current since the wire will become heating element as higher current than what 12GA thickness of copper can handle goes through it and meets the internal resistance of the wire. There are different materials wire can be made so it handles higher than pure copper current but in this case if it's rated to 15A then stick to that as constant max, as far as short instance it should handle around 20A but I wouldn't run it at that rating for long.
For simple example imagine sending 20 people through tunnel that can only fit 15 wide and ask them how they feel about it.
Dont be a dick...Read the context of his reply...
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So the question is how much current will be pulled through the extension cord. If you dissipate 1200W at 120V, that's 10 amps going through the extension cord (assuming a power factor of 1, I hope this is mostly reasonable), which gives you pretty good margin on the15A limit. It's also worth pointing out that "starting mode" means inherently that you aren't running it for more than a few seconds. If 12 gauge wire is rated for 15A , that almost certainly means continuously (12 gauge NM Romex would typically be rated for 20A continuous)... So, even if you exceeded 15A for a few seconds, it's a non-issue since heat takes a while to build up. It's pretty common for 120V welders to exceed 15A when the arc is first being struck, and it generally doesn't matter, the breakers don't even notice. In other words, there's a huge amount of margin.
What's more, most 120V single phase house wiring in the US is 12 or 14 gauge which is rated for 20A or 15A respectively, and tied to a 20A or 15A breaker respectively. So, it'd be really odd to manufacture a battery charger that exceeds 15A over more than a second or two since many breakers would be unhappy with it.
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I used to roll it up on a wheel but learned that wasn't a good way to store it and have use the recommended way for the last 1 plus years. Hoping that this recommended way keeps the next cord in better shape longer.
Couple years ago, after moving to the Buffalo area, I picked up an electric snow blower, along with a 100 foot 12/3 extension cord. The cord ran me ~$50. Figure the inflation we're seeing these days, and I'd consider the price of this deal to be 50% of what it could be!
Also found them at a HD for a good price and the same thing happened. Isn't there some method to keep the store price when having items shipped to you ?
Sign up for a Slickdeals account to remove this ad.
They said there was 28 of them "somewhere" in the store.
I did get a 50' and 2 25' though
For simple example imagine sending 20 people through tunnel that can only fit 15 wide and ask them how they feel about it.
Sign up for a Slickdeals account to remove this ad.
For simple example imagine sending 20 people through tunnel that can only fit 15 wide and ask them how they feel about it.
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!