New Delhi: The ministry of new and renewable energy has notified that solar modules, inverters and storage batteries must conform to the latest norms of the Bureau of Indian Standards (BIS) and comply with minimum efficiency criteria. The move is aimed at promoting high-quality and efficient solar photovoltaic products for sustainable energy and storage, the ministry said in a statement. The revised order introduces detailed testing and efficiency requirements for solar PV technologies, including crystalline silicon and thin-film photovoltaic modules. It also specifies rigorous safety measures for inverters and storage batteries to meet global standards. The government has given the industry six months before the order comes into effect.