POWER SUPPLIES (PSU) RUN BEST AT 50-70% LOAD--
Running a power supply at max load will wear it out prematurely. And, a cheap PSU at max load can fail with a fire hazard because they may be improperly rated. A 2000W cheap PSU on a 110V (USA) circuit would likely overload the 110V circuit and could possibly cause a house fire, not just an explodong PSU.
A cheap PSU will explode when run at max load. --scryptr
Thats what I wrote often before. NEVER buy cheap. You only have one life. Saving a few bucks with cheapest hardware is just stupid.
I second this. Most US household plugs are rated for 15 amps. That's 110V * 15A = 1650W. My extension cords get scary warm at already 1250W even without tripping the fuses... So please take care, measure your consumption if you don't know it, and stay safe.
A continuous load (e.g. a 24/7 mining rig) should generally be held to 80% of a circuits nominal rating. That 15a rating is for transient / short-term loads. For instance, I have a 20a PDU which is already derated to 16a to enforce this rule.
Also, not all extension cords are equal. You should look for high amp/power cords - heavy duty, prob 12g or 10g wiring, and no longer than necessary (typically used for large outdoor/construction equipment like saws.)
Also, the longer the extension cord, the more the voltage drop and higher amps needed for same wattage (which doesn't charge if you're mining with same setup).