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.
Ordered 2 of the 25' cords from the local store. That's all they had.
They have some 50' cords from the store on the other side of town. But having to deal with that brutal drive not worth it. Would probably be 1 1/2 round trip minimum.
Grabbed 2 of the 50ft cables. To save your time, plz go the very back side of store at clearance section. They don't have these at the regular aisle
I ordered online with store pickup. I guess the problem with that might be the person is lazy or doesn't know where it is, then they cancel the order as out-of-stock. I guess if they cancel my order I might run over to the store and look for myself as you suggest.
Got one of each by going to the store in Philly suburbs. It took a while to find them at my location (they were on an extra high shelf). Multiple people buying apparently though because employees were trying to find them.for online orders.
Item #5020239
Model #2548SWUSA1LREC
(50' length) is showing up as $73.98 for my Zip code (D/FW area of TX).
Similarly, the 100' showed at regular price for me. So I went in hunting for the 50' which showed at the clearance price, and there sat the 100'ers at the clearance price. For whatever reason, the online pricing is not reliable for in-store clearance.
None of the cords are available in my area according to the lowes website. I was able to buy some 50 footers at Home Depot for 27 each with free shipping. Thanks to the person who mentioned this alternative before!
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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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170 Comments
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They have some 50' cords from the store on the other side of town. But having to deal with that brutal drive not worth it. Would probably be 1 1/2 round trip minimum.
Great deal.
oh well.
best of luck to everybody else.
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Model #2548SWUSA1LREC
(50' length) is showing up as $73.98 for my Zip code (D/FW area of TX).
Model #2548SWUSA1LREC
(50' length) is showing up as $73.98 for my Zip code (D/FW area of TX).
Sign up for a Slickdeals account to remove this ad.
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!