Tesla has already shown that it can “kill the duck” with grid-scale batteries, by reducing the need for expensive and polluting “peaker plants.” As more homes install Powerwalls too, it should also help even out residential demand by allowing homeowners to use their own solar first, and to also take advantage of off-peak rates to replenish any shortfall. But how does it work in practice? Robert Llewellyn recently installed a Powerwall 2—and in one of the latest episodes of Fully Charged, he goes into typically in-depth and geeky detail to share how it’s been. Here’s the single biggest takeaway: Since installing the battery pack some 3 months ago, he says he has used ZERO energy from the grid during peak hours. And that’s in the not-so-sunny UK. Part of the reason for that, I believe, is hidden in the way that Robert reviews this installation: He’s clearly adapted his behavior—changing when and how fast he charges his cars—in order to maximize the amount of homegrown energy he is reliant on.
Tree Hugger 19th Sept 2017 read more »