Great points, but about energy storage in the home, mentioning tablets and smartphones, those are insanely negligible. An iPhone has about a 6 watthour battery.

Great points, but about energy storage in the home, mentioning tablets and smartphones, those are insanely negligible. An iPhone has about a 6 watthour battery. A large TV uses about 240 watts, so hooking up your iPhone to just your TV gets you about 90 seconds of power. A typical 1000+ watt coffee maker or microwave or toaster won't even be able to make you coffee or hot water or toast because the iPhone's battery lasts about 20 seconds. That's why the whole Tesla car battery and home battery is interesting, because the latest Teslas have about 80000 watt hour batteries, or the equivalent of having 13 thousand iPhone batteries in your garage, and the powerwall batteries they sell each have the capacity of about 1500 iPhones. If everyone had such an electric car and battery pack, intermittent sustainable energy would make a lot more sense, but phones and tablets aren't going to play any role in energy storage. Laptops with 100 wh+ batteries could play a tiny tiny role, but that market is all going fanless on ever more powerful and efficient mobile chips, so I don't see that happening either.