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We get asked about the battery question almost on every job, and we tell them to wait And I tell them there's some really exciting technologies that are coming down the pipe

There's flow batteries, potentially, high energy density flow batteries There's nanotech enhanced lithium ion that's coming There's liquid salt batteries that are coming There's a number– potentially, ultracapacitors Batteries have a bad reputation, but what we're working on are supercapacitors, and supercapacitors you can think of as a charge storage device like a battery, except it charges and discharges 100 to 1000 times faster

A supercapacitor is one which combines the best attributes of both If you think about all the electronic devices you have, right now, every time you need one, you realize, oh, I forgot to charge it up But imagine if you could take that same device, plug in the wall for 30 seconds or a minute, and be ready to go There's a number of really exciting battery technologies all competing to fill the super battery space, or the battery of the future– the battery that can power your whole house, last for 10 to 20 years, and not cost you too much That battery's coming, and it's not quite here yet

Cost of lithium ion has dropped precipitously over the last several years, but it's not quite there yet And so we tell our customers to wait The day will come, and it's not too many years in the future when you'll be able to power your life off of solar, not just during the daytime when the sun's shining, but also at night You'll be able to put a battery in your garage that's the size of a refrigerator that'll run your whole house for a couple days I'll give you an example

Lithium iron phosphate two or three years ago cost $1000 per kilowatt hour Today, we can buy it for $350 a kilowatt hour Elon Musk with Tesla is talking about $200 per kilowatt hour When we hit that level, when we hit $200 per kilowatt hour, the game starts to change When you pair storage with solar, you have a world-changing, a paradigm-changing technology mix

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