The concept of home battery storage isn't new. Off-grid solar photovoltaic (PV) and wind electricity generation on remote properties has long used battery storage to capture the unused electricity for later use. It's very possible that within the next five to 10 years, most homes with solar panels will also have a battery system.
A battery captures any unused solar power generated during the day, for later use at night and on low-sunlight days. Installations that include batteries are increasingly popular. There's a real attraction to being as independent as possible from the grid; for most people it's not just an economic decision, but also an environmental one, and for some it's an expression of their wish to be independent of energy companies.
If your solar panel array and battery are large enough, you can run your home substantially on solar power. Using electricity from your battery can be cheaper per kilowatt-hour than using electricity from the grid, depending on the time of day and electricity tariffs in your area.
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