For a long time, off grid and photovoltaic backup suppliers have been quietly supporting solar energy storage applications, while the largest solar photovoltaic installers in the United States, such as Sunrun, SunPower, and Tesla, have started providing battery products to their customers in the past few years. The two companies continue to report a sharp increase in their share of traditional pure photovoltaic products in battery sales. The emergence of lithium ion batteries with good packaging and long lifespan makes energy storage more attractive to consumers.

When the giants of the solar energy industry begin to support batteries, their marketing, information, and political influence will raise awareness among consumers, businesses, and governments. Their small competitors will also participate, so they won't fall behind.

One of the most reliable signs of batteries becoming mainstream in households and businesses now is their inclusion in the latest regulations and standards. The building and electrical codes released in 2017 and 2018 recognized batteries, but rarely insisted on adhering to the new UL9540 safety testing standard at that time.

After fruitful contact between industry representatives and the main drafter of national safety regulations, the authoritative battery safety standard, National Fire Protection Association (NFPA) 855, was released at the end of 2019. The next round of regulations starting from the 2020 National Electrical Code has been or will be coordinated with NFPA855 to provide inspectors and building officials with the same level of guidance as HVAC, water heaters, and windows.

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In addition to ensuring safe installation, these standardized requirements also help construction officials and inspectors continuously implement safety requirements, making them more comfortable when handling batteries and related equipment. As inspectors and officials develop procedures that allow for the installation and approval of battery installations, the risks and time associated with these critical steps are reduced, thereby shortening project time, reducing costs, and improving customer experience. Like previous indicators, this is a positive strengthening cycle that will continue to drive growth in the rapidly maturing solar energy storage field.