On 01/03/2014 08:24 AM, Steve Clunn wrote:
Like most EV drivers on the list, my thoughts about selling electricity from my battery pack has not been very positive. Looking at the numbers, a 100ah Lithium cell stores 300watts and if we said 3000 cycles is 900kw or $90.00 worth of Electricity at 10cents a kw. So the storing of the electricity costs about twice what the electricity costs. If you wanted a kw it would cost me 30 cents ( this is not profit). We add on another 10 cents for profit and now we would need to sell our electricity for 40 cents a kw. Is there ever a time the power companies would buy it at this price?
A VERY good analysis, IMHO!
But overly optimistic, I believe. A practical cycle is more like 150-250 watt hours (watt HOURS). More realistic cycle life is 1000-2000, though it seems 4000 is possible. So, a $110-$120 cell will pass something like 500kwh (wk HOURS) during it's life. Only $50 worth of electricity is most places. Again, a VERY good way to look at it: your battery is likely to cost you at least twice the electricity you use. AND you would not likely be paid reasonably in a V2G situation.
Similar numbers for production EV batteries are obscure but I think they are not far from the chinese LFPs.
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