In a nutshell: Watts = $$
If you find extension cords for sale, especially long ones, get a bunch. Use a sharpie and write your name and contact information on each one, at each end. If you can, get a weird color (I have a purple extension cord that I have never lost), but if not, definitely mark them at each end. And it’s probably the case that you can’t have too many.
Remember that there’s a difference between thick conductor and thick insulation. Check the wattage rating of the cords. A lot of times stores sell “heavy duty” cord that’s exactly the same wattage, but just has thicker rubber around it.
Another easy way to tell is that higher power rated cables cost more. Usually a lot more.
Know what you’re buying.
