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.
Thanks OP.
I grabbed (6) of the 50's and (4) of the 25's for shop/field use.
My local store did not have any of the 100's, and when I tried to get any shipped, the price jumped up.
No big deal... I really didn't need any of the 100 footers anyway. 25's and 50's are cheaper to replace when a section gets cut rather than trashing out a whole 100' when a cut/break happens.
Not worth it to me, at least not when cables can still be purchased this cheap. by the time I pay for replacement ends and take the time to do the repair, or pay someone to do it correctly, it ends up costing more than the price of these cables. Not to mention the lost productivity. Extension cables are a consumable item for me.
This is a phenomenal deal, but I'm not seeing it at any length anymore. Personally I much prefer SJEOW or SJOOW jackets over SJTW since they are much more flexible at all temps and tend not to have as much "memory" effect... but for this price nothing even remotely comes close
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Not worth it to me, at least not when cables can still be purchased this cheap. by the time I pay for replacement ends and take the time to do the repair, or pay someone to do it correctly, it ends up costing more than the price of these cables. Not to mention the lost productivity. Extension cables are a consumable item for me.
Exactly. Just repaired a cord using new ends. I spent almost $15 dollars to repair it
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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 grabbed (6) of the 50's and (4) of the 25's for shop/field use.
My local store did not have any of the 100's, and when I tried to get any shipped, the price jumped up.
No big deal... I really didn't need any of the 100 footers anyway. 25's and 50's are cheaper to replace when a section gets cut rather than trashing out a whole 100' when a cut/break happens.
https://www.homedepot.com/p/Southwire-50-ft-12-3-SJTW-USA-Outdoor-Heavy-Duty-Extension-Cord-with-Pow... [homedepot.com]
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Our community has rated this post as helpful. If you agree, why not thank GringoBling
If anybody knows where to get the 25 or 50 in North NJ, please let me know
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