Adding solar battery storage helps you maximize the benefits of your solar energy system. Not only can you use it for backup power to avoid power outages, but you’ll be able to store excess electricity produced during a sunny day to use at night or when it’s cloudy. You’ll gain energy independence and you can also use your solar battery (or batteries if you install a battery bank for extended energy storage) to avoid peak demand pricing from your utility company (this isn’t happening for residential customers in Massachusetts currently, but it is in other states and could be a factor for local homeowners in the future).