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Post by FurryCatHerder on Feb 23, 2009 15:14:45 GMT
furrycatherder writes " It might well be that whoever manages the grid in Ontario doesn't think it's worth the cost. I keep 25KWH in store myself" 25KWH!!! This is a miniscule amount of electricity. The average load in Ontario is in excess of 10 gigawatts. This is about 250 gigawatthours per day. So your storage is an absolutley minislcue amount. I am trying to work out what fraction 25KWH is of 250GWH. Maybe I am wrong but it must be something like 1/10,000,000. 1). I'm just me. 2). There's no need to store an entire day's worth on a grid scale. 3). Since the population of Ontario is 12.9 million, and 12.9 million * 25KWH is greater than 250GWH, if everyone in Ontario did what I did, the amount of storage would exceed a day's demand. FWIW, the 25 KWH occupies a 3' by 3' concrete pad.
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Post by jimcripwell on Feb 23, 2009 17:57:03 GMT
Furrycatherder writes "FWIW, the 25 KWH occupies a 3' by 3' concrete pad."
What stores the electricity? Some sort of battery? At my cottage, there are a number of permanent homes. After the ice storm in 1998, every single permanent home installed emergency generators; none of them installed any form of electricity storage. I wonder why; maybe cost and effectiveness.
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Post by cyberzombie on Feb 23, 2009 18:01:02 GMT
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Post by FurryCatHerder on Feb 23, 2009 18:21:41 GMT
Furrycatherder writes "FWIW, the 25 KWH occupies a 3' by 3' concrete pad." What stores the electricity? Some sort of battery? At my cottage, there are a number of permanent homes. After the ice storm in 1998, every single permanent home installed emergency generators; none of them installed any form of electricity storage. I wonder why; maybe cost and effectiveness. Electric storage really only makes sense if you are making your own. I'm 640 watt-hours from breaking even for the day, and should have a surplus of 3 or 4 was 5 KWH by the time above usage when the panels stopstopped. If I didn't have battery storage (Flooded Lead Acid) I'd be out of power come 5 or 6pm when the sun is too low to make electricity. With batteries I'd have power until the sun came back up the next day.
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Post by FurryCatHerder on Feb 23, 2009 18:23:04 GMT
Yes and no. I'd much rather work around batteries at 48VDC than around a super capacitor at 1KV or more. If the technology gets to a point where they are plug-and-play simple to use, sure. Why not. But they aren't there just yet and lead-acid batteries remain a VERY cost-effective solution.
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Post by jorgekafkazar on Feb 24, 2009 5:37:49 GMT
Improvements in energy storage are always a good thing. But the maximum achieved 30 Wh/kg energy density of supercapacitors is pretty feeble, barely overlapping lead-acid batteries. Compare this to: (Mechanical applications): Flywheels 120 Wh/kg (Electronic applications): Nickel Metal Hydride Batteries 60 Wh/kg Lithium - ion Polymer Batteries 130 - 1200 Wh/kg (Heating applications): Wood 2000--4000 Wh/kg Coal 6667 Wh/kg.
Of course, none of these is in the same league with Uranium 2.5x10^10 Wh/kg.
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