As the adoption of renewable energy accelerates in the United States, home energy storage systems (HESS) have become an essential choice for many households. Lithium batteries, known for their high energy density, long lifespan, and high efficiency, are widely used in these systems. However, to ensure product safety, reliability, and compliance, lithium batteries must meet a range of certification standards in the U.S. This article outlines the key U.S. certifications lithium batteries.
UL 1973 is the safety standard for batteries and power systems used in stationary energy storage applications, such as home energy storage. It covers tests for thermal runaway, electrical overcharge, and short-circuit protection, making it one of the most critical certifications for lithium batteries in home systems.
UL 9540A is a test method for evaluating thermal runaway fire propagation in battery energy storage systems. It is usually used in conjunction with UL 9540 (the full system certification) and is a key requirement for market entry in the U.S.
03. UN38.3 Transportation Certification
The UN38.3 certification ensures that lithium batteries can withstand extreme conditions such as temperature changes, shock, and vibration during transport. It is an essential certification for shipping, logistics, and installation processes.
04. FCC Certification (Electromagnetic Compatibility)
The Federal Communications Commission (FCC) certification focuses on controlling electromagnetic interference (EMI). Since energy storage battery systems often include electronic control units, they must comply with FCC Part 15 standards to avoid interfering with other electronic devices.
Although RoHS is primarily enforced in the EU, some U.S. states (like California) have strict regulations on hazardous substances. Batteries that comply with RoHS standards contribute to reducing environmental pollution and enhancing a company’s green competitiveness.