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Beyond Battery Technologies This topic has some interesting views and considerations, to which I want to add something about high density Amp Hour storage for long duration without chemical electrolytes. And hence this is another technology to invest in that has a great potential to grow beyond battery technologies for the numerous merits listed below. http://www.evanscap.com/ Evans Capaterry Products "Capattery style super capacitors are designed for longer duration power hold-up and memory back-up applications. Full operating temperature range of -55C to 85C." ~ Evans Capacitor A salesman at Evans told me that the largest Capattery (a Super Capacitor) that they have made on special order was 300 Farads. Which is equal to 300 A hour at 1 volt. But these Capattery technologies can hold a much higher voltage than 1 volt. A 12 volt capacitor rated for 300 A hour is equal to a deep cycle marine battery. The Super Capacitor is capable of charging faster than a chemical battery. And does not require maintanance. And does not have toxic chemical waste such as sulfuric acid, nor lead, not lithium to worry about. Hence is environmentally friendly. It can last for 20 years or more and can hold a charge that long too ~ with little loss. According to a feature in the Federal Laboratory Consortium News Letter a fews years back. A new diamond deposit dielectric was invented that can make Super Capacitors of larger Farad values but smaller in size. And the diamond hard dielectric will hold up to larger voltages. Hence I am looking to see even more interesting Super Capacitor technologies. Anyways this will solve the problem with batteries for use in hybird electric automobiles and home grid tie battery banks. Which have no chemical maintanance and which last longer, as well as will not create a enviornmental problem. The only reason the Evans and other Super Capacitor companies are not making larger stock sizes than 1 Farad. Is that at the moment no one has created a demand. But demand will bring such things to market. You can inquire of what Evans can do, and also check out other potentially new emerging companies that make Super Caps. All you have to do is decide you want to invest into Super Capacitor technologies for green investments. And so, I would suggest that you keep an eye on this market and it's innovations and trends. And so, not always be looking at strictly battery technologies. I personally think these will make better batteries.