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Hybrid Vehicles Hybrids - News, Reviews and Views in the Press
567 messages, Last post on Oct 30, 2009 at 9:21 PM
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Replying to: tpe (Aug 02, 2007 5:45 am) I have personally considered trying solar again. Many neighbors near my new home have large arrays in their yards. One neighbor about a mile from me has at least 100x100 array. He must be selling back to the utility.
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Replying to: gagrice (Aug 02, 2007 6:12 am) That's a huge PV system that should produce over 1,000 kWh per day. Since the average family doesn't use more than 50 kWh/day in electricity that leaves a lot to sell back. Unfortunately a system that size would cost at least $500k probably closer to a million. The solar panels today are much better than 10 years ago. Not only has the efficiency gone up but they now have warranties of 20+ years and are expected to last considerably longer than that. The downside is that because there is so much worldwide demand for these PV panels the price hasn't been dropping much in the last couple years despite huge increases in manufacturing capacity. Did CA's one million roof initiative get passed? If so there are probably some pretty good tax breaks going on for installing one of these systems. I don't think it makes all that much sense to try and charge an EV directly from a PV system. Simply send this electricity to the grid during the day and reclaim it at night.
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Hybrid sales on pace for record-setting year quote- An estimated 187,000 hybrids were sold in the first six months of 2007, accounting for 2.3 percent of all new vehicle sales, according to J.D. Power and Associates. Although a sales slowdown is expected in the second half of the year, J.D. Power is forecasting total sales of 345,000 hybrids for the year, a 35 percent increase from 2006. -end |
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Replying to: tpe (Aug 01, 2007 6:46 pm) We did look at household energy bill savings when planning the PV just like we looked at gas-pump savings when buying our hybrid but money savings were not the only factors. We got the hybrid mainly for its emission. I almost went for a Prius except it could not meet our needs. The PV was for independence from PG&E, for doing our part as long time Sierra Club members  , and it is also part of our "emergency" planning in earthquake country. Whenever a plug-in appears for a reasonable price, we are ready .
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Replying to: gagrice (Aug 02, 2007 6:12 am) That is 10,000 panels and if each is 185W, at 85% efficiency (limited by inverters and CA law if in CA), that is still 1,572,500 W of power! That is a 1000 KWh or 1MW system! Enough to light up a small village. 185W panel is popular in residential installation, some go as low as 145W. I know PG&E gets nervous when residential installation goes beyond 20KW and they really get nervous when it hits 30KW grid-tied because it could impact their transformers and power lines with such a load. For a 1MW system, it would rate as commercial, most likely completely stand-alone. Anyway, I digress from the EV discussion, sorry! 
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Replying to: cdptrap (Aug 02, 2007 9:11 am) I'm totally unfamiliar with it. |
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Replying to: tpe (Aug 02, 2007 6:38 am) |
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Replying to: kdhspyder (Aug 02, 2007 11:43 am) Our 9KW is grid tied without battery back-up or storage. All excess power feeds to the grid and we trade credits with our power company, PG&E. During peak hours, we get 3W credits for every 1W sent to the grid. During non-peak hours, it is a 1 for 1 trade. Power companies do not want battery back-up power feeding back into the grid when the grid is down and being repaired. This unexpected juice can injure or kill a worker working on the line. So a properly installed battery power back-up for a grid-tied system will always cut off grid feed before coming on-line. Battery back-up is also limited so it is not useful to feed any back into the grid. Whatever is not used will just remain in the batteries. In our case, if we own a plug-in and charge it at night, it will draw power from PG&E. Our day time PV credits will pay for that usage. In the day, it will charge using our PV power. If our PV cannot generate enough to meet demand, it will automatically draw from the grid to make up the difference. Again, we just pay for it using our credits. Hope this answers your question?
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Replying to: cdptrap (Aug 02, 2007 4:47 pm) |
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Replying to: cdptrap (Aug 02, 2007 4:47 pm) |
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