To make the math work, I should have said, "the average house with teenagers leaving all the lights on for 5 hours a day". [50 lights times 60W saved times 5 hours a day = 40 miles daily EV charging]
I stand by my numbers when corrected to a house that leaves most of their lights on all evening and assuming averqaeg 75 Watt incandescent bulbs originally.. The average house with compulsive behaviors who turn off every unused light will be 10% of this as Matt noted... But he equally exaggerated errors. . On Jul 25, 2018, at 1:08 PM, Matt Awesome via EV <ev@lists.evdl.org> wrote: >> Remember this factoid. >> Swapping out the average American home from Incandescent bulbs to >> LEDs saves the same amount of power needed to charge an EV the >> American 40 mile average per day forever. > > Plainly, no, it won't. > >> 50 bulbs saving an average 60 watts each for 5 hours a day is 15 kWh. > Who the hell leaves 50 lightbulbs on in their house for 5 hours a day? > I don't even think I have 50 lightbulbs in my house, let alone leave > them all on 5 hours a day. > > LEDs aren't free, so, there's not 60watts savings from a 60w bulb. I assumed an average 75W equivalent bulb (saving 60W) when going to a 9W LED. And around here, 60W equivalents are about $1 each (probably subsidized by the utility). > How many Kwh does an average US household consume in a day?: ... > That's 27kwh/day. > > What percentage of an electrical bill is comprised of lighting?: ... > Source 3: - 9%. > Source 4: - 6%. > > The split [might depend] on whether heat is made through gas or electricity. > So, we could say 27kwh/day of which lighting is 6% or 15kwh/day of > which lighting is 9% to at least be in the right ballpark (to arrive at this:) > - 27kwh*6% = 1.62kwh/day. > - 15kwh*9% = 1.35kwh/day. > > You're claiming 10x that amount in *savings* from switching to LED, ... Yes, I should have said in some homes who leave every light on all evening... >> Charging an EV at 1.5kw for 10 hours a day is 15 kWh. > > Since it's not the 1970s, the average household has at least 2 > vehicles, more when there's teenagers/college kids. I said for one EV. I didn't say for every car a household could own. > Add in that LEDs aren't free, you're off by a factor of 25x. I included their 9W when subtracted from an incandescent 75W to arrive at 60W savings per bulb. And around here they only cost $1 each for a 60W LED. > It would be more accurate to say that by switching from incandescents > to LEDs, you could expect to save enough energy to cover 4% of your > electric vehicle use. A pretty banal, unsensational, non-headlight > grabbing rhetoric for sure, but at least an accurate one. I stand by my numbers when corrected to a house that leaves most of their lights on all evening. Bob, WB4APR _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
