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Hybrid Vehicles Electric Vehicles Electric Vehicle Pros & Cons
1586 messages, Last post on Oct 23, 2009 at 4:19 PM
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Replying to: tpe (Aug 03, 2006 3:34 pm) Ditto that. I just paid over 19 cents per kWh for a good part of my bill last month (the rate steps up with usage). That makes the 27 cents per kWh for a sunny location not sound so out of line. |
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Replying to: prm2000 (Aug 03, 2006 4:35 pm) Based on your comments, I feel safe to conclude: 1. Electric is less polluting and will continue to improve, 2. Battery technology will continue to improve to allow for longer range and less interruption for re-charge, 3. Those of us that are able to generate our own power will have an increased motivation to do so, which should also help drive down the price, 4. Gas prices will increase to the point that even those that would prefer to keep their old polluting vehicles, would have to let their wallets dictate a cheaper solution.
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Replying to: tpe (Aug 03, 2006 3:34 pm) You can't. But you are ENTIRELY missing my point. If one buys an electric vehicle, and PLUGS INTO THE GRID, the odds that the electricity they use will be from solar PV will be essentially ZERO. Why? Because utility companies can produce electricity all day long at 3-5 cents per kWh using fossil fuels. Now, if one were to install their OWN set of PV cells (which is where all the explosive growth that you mentioned is coming from), and THEN plugged their electric car in, this would be the 'cleaner' solution. Please understand, I'm not AGAINST electric cars. I'm just saying that those who go that route and pull energy off the public grid MAY NOT be reducing pollution/demand for fossil fuels as much as they think.
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Replying to: rorr (Aug 04, 2006 5:10 am) I agree with that. The terms "green" or "clean" are not absolute. It would be more accurate for a person driving an EV to state that he has made a "greener" choice. He is still impacting the environment, just not as much as if he was driving an ICE.
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Replying to: prm2000 (Aug 03, 2006 4:35 pm) I'm going to dig a little deeper on this issue but I have this comment to make regarding one of their assumptions: They've comparing the emmissions from various types of power sources supplying electricity for EVs against the vehicle emmissions from an AVERAGE fleet of cars using ICEs. Is this a valid assumption to make? How likely are owners of large trucks/SUVs to move to EVs? And how likely are the owners of EVs to be migrating from current LEV and ULEV cars? I'm going to try and dig up the emissions numbers for the vehicles which are actually USED by those most likely to make the step from ICEs to pure EVs. I'll then compare THOSE emissions numbers to the emission numbers used in that analysis.
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Replying to: tpe (Aug 04, 2006 6:22 am) Again, we don't know that. The EV study reference above compared the emissions from various power plants to the emissions of AVERAGE vehicles. If one is already driving a LEV or ULEV Honda (or perhaps a hybrid like the Prius), if THOSE people make the jump to EV, what is the comparison of their current ICE emissions to that of a power plant? In all honesty: who is more likely to make the jump to a 100% EV - the current owner of a Prius or the owner of a 10-year old Chevy Malibu?
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Replying to: rorr (Aug 04, 2006 5:10 am) The 50% of electricity that is coal generated might not reduce emissions as much as people think (although it still reduces emissions), but the other 50% of generated electricity would reduce emissions dramatically. In this whole discussion I don't hear enough talk about how electric cars would dramatically reduce the amount of oil we import. At the moment the national security issue is the most important factor to me. The increased efficiency and dramatically reduced emissions are gravy. I think it is criminal that politicians help Detroit and Big Oil to suppress the electric car, and then spend many billions to fight foreign wars to stabilize the middle east oil fields.
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Replying to: prm2000 (Aug 04, 2006 6:38 am) For a very good reason, I will not contribute to such a discussion. Discussions regarding emissions comparisons and energy production can be done in a (somewhat) level-headed means. Facts and data can be presented and mulled over. Agreements can be reached (I think) without too much animosity. However, if some individuals simply feel COMPELED to drag politics into this discussion, it can ONLY end up with one side wanting to pull the ears off the folks on the other side. If your INTENT is to run me off, then by all means let's have this discussion degenerate into whining about 'Big Oil' and 'foreign wars to stabilize oil fields'.
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Replying to: rorr (Aug 04, 2006 6:37 am) Tesla Motors has an arrangement with solar installers for buyers interested in re-charging their Roadster with the sun's energy. People that can afford this car can probably also afford a PV system. That represents closing the loop.
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Replying to: tpe (Aug 04, 2006 7:48 am) My question was in regard to ALL emissions. And the data link posted by prm2000 contained info relating to both CO2 and non-CO2 emissions. Which is why I brought up the issue of LEV and ULEVs. You are correct. CO2 emissions are essentially a pure function of gas mileage rather than degree of emissions control. LEV/ULEV vehicles aren't necessarily any better at controlling CO2. To that end, I'd like to contribute the following data (from fueleconomy.gov) The Prius will generate roughly 3.4 tons of CO2 per year (15,000 miles/year). This equates to 0.45 lbs/mile of CO2 which translates to approximately 125 grams/km. The study referenced by prm2000 assumed an AVERAGE vehicle CO2 emission (composite number of cars and trucks) of roughly 250 grams/km. These numbers indicate the Prius generates 50% the GHG of the average vehicle from that study. And the study further states that electricity generated from coal powered sources would generate 55%-59% less GHG of the average vehicle. So, IF comparing a Prius to the GHG produced by a coal-fired plant for EV use, CO2 production is close to a wash. It then DOES become of interest what the OTHER non-CO2 pollutants look like. To achieve ULEV status, vehicles must emit no more than: 0.04 gm/mile (0.025 gm/km) of Total Hydrocarbons (HC) 1.7 gm/mile (1.06 gm/km) of Carbon Monoxide (CO) 0.05 gm/mile (0.031 gm/km) of Oxides of Nitrogen (NOx) The 'Average car' values used in the study for these same criteria are: 1.07 gm/km for VOC+TP (HC) 9.23 gm/km for CO 0.88 gm/km for NOx. It is further stated that a coal-fired plant would reduce these levels of non-CO2 emissions by "80-92% depending on the type of coal". Which would give the following levels of non-CO2 pollutants: 0.086 to 0.214 gm/km of HC (2x to 5x HIGHER than ULEV) 0.738 to 1.846 gm/km of CO (74% higher to 44% lower than ULEV) 0.07 to 0.176 gm/km of NOx (2x to 6x HIGHER than ULEV) Bottom line: With hybrids, it is possible to achieve roughly the same level of CO2 emissions as an equivalent EV vehicle with electricity sourced from a coal-fired (a MODERN coal-fired) power plant. Also, an EV with electricity sourced from a coal-fired plant would generate AT A MINIMUM TWICE the HC and NOx pollutants (and as much as 5x to 6x depending on the quality of the coal) compared to a current ULEV vehicle. Carbon monoxide emissions appear to be highly dependent on the type of coal used in the plant. So, if an individual lives in an area served by coal-fired plants (or if additional electrical demand would be met by a coal-fired plant), does it REALLY make more 'green' sense to go EV or conventional hybrid?
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