The big idea right now for solar and batteries is this: put solar panels on your roof, a battery in the backyard (or basement), and become utterly independent from the power grid, using free electricity from the sun. Batteries have long been looked to as a way to store energy solar energy during the day to be used at night, but they have long been too expensive to be used widely. But many companies are looking at 2015 as a very important year for the solar and battery partnership and I’ve heard the word “tipping point” being used repeatedly about this intersection recently.
Why all the excitement and why now? First off, traditional lithium-ion batteries — the kind being widely used in cell phones and laptops — are becoming cheaper than ever before. Electric car company Tesla and Japanese battery giant Panasonic have been working closely on lowering costs of their lithium-ion batteries significantly, and with Tesla’s “gigafactory” the companies expect to be able to reduce the lithium-ion battery cost by another third.
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