I usually do not comment on energy use posting because this is an ev blog. However, if you want to save energy in a house, buy a hybrid hot water heater. They cost $1800 - $2000; but they are worth the money. They have a 20 yr warranty on the tank. The average HW heater has a 8 - 10 yr warranty and little insulation (fast heat loss). I purchase a used one made by GE off of craigslist for $200. I installed an energy monitor with a totalize for KW-Hrs. My pay back is less than one year because I replaced a builder grade propane HW heater. It beats LED lighting any day. I also use LED lights.
________________________________ From: EV <ev-boun...@lists.evdl.org> on behalf of Matt Awesome via EV <ev@lists.evdl.org> Sent: Wednesday, July 25, 2018 11:08 AM To: Electric Vehicle Discussion List Cc: Matt Awesome Subject: Re: [EVDL] Charging load on the grid (NOT) > Remember this factoid. I'm all for saving energy and obviously I'm here so I'm passionate about EV use, but, it's also important to me to not treat this like some kind of religion. > 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. Anyone with that many fixtures is putting 40w bulbs into them. And LEDs aren't free, so, there's not 60watts savings from a 60w bulb. Let's try to get some more realistic numbers. How many Kwh does an average US household consume in a day?: Source 1: https://www.eia.gov/tools/faqs/faq.php?id=97&t=3 - Independent US Energy & Information Statistics says ~10,000kwh/year. That's 27kwh/day. Source 2: http://www.nationmaster.com/country-info/stats/Energy/Electricity/Consumption-by-households-per-capita#2005 - Around half that. What percentage of an electrical bill is comprised of lighting?: Source 3: https://www.eia.gov/tools/faqs/faq.php?id=96&t=3 - 9%. Source 4: https://www.quora.com/What-percentage-of-energy-consumption-is-from-lighting-in-a-typical-American-house - 6%. The split seems to vary depending on whether heat is made through gas or electricity. Meaning the lower percentage use numbers for lighting are from houses that use 2x as much electricity (for heat). If they're not making heat electrically, their lighting percentage is higher (but the same net total). 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 (this argument is about general scale, not really precision). What is the average lighting demand for a US household?: - 27kwh*6% = 1.62kwh/day. - 15kwh*9% = 1.35kwh/day. Somewhere around 1500 watt-hours a day. You're claiming 10x that amount in *savings* from switching to LED, let alone total lighting use. > 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. So... your "factoid" for a household is now off by a factor of 20x. Add in that LEDs aren't free, you're off by a factor of 25x. 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. You can nitpick those numbers a bit, they might be off by, oh, perhaps double, but they're not off by an order of magnitude. _______________________________________________ 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) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180726/09fca685/attachment.html> _______________________________________________ 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)
