Energy Storage is a hot topic nowadays. In Europe and some USA States, where homeowners are charged time-of-use rates, it makes sense to invest in a battery to store solar electricity for use at times when the rate charged per kilowatt hour is highest.
In Ontario, once the grid connection is changed to net-metered, the smart meter is removed and the customer is charged a flat rate so the rate charged is no longer affected by time of use.
Ontario customers at this point in time do not need a battery for energy storage as a net-metered connection allows consumers to use the grid as their battery.
Back-Up power is an entirely different issue. I will discuss battery back-up in my next post.