The vast majority of small energy storage systems (ESS) are in the range of 5 to 300 KW with a backup that can vary between 2 to 12 h. For the latter, a well-designed system with lead–acid cells of appropriate quality can provide a robust technical and economical solution. In rural India, a typical off-grid ‘Microgrid solution’ with a dedicated solar plant has been used to demonstrate such a backup. This involves a grid-integrated small ESS that serves a limited community of users who experience significant demand fluctuation with peaks arising at around the same time on each day. The presentation reports the overall economics of the system, both in terms of upfront storage block capex as well as an indicative levelized cost of energy (LCOE). The key target is to improve the life of present battery technology to 3000-4000 cycles at a given depth-of-discharge. The options available and the necessary improvements are discussed. Finally, the role of a ‘Management System’ as opposed to a ‘Monitoring System’ is critically examined.
Dr Dipak Sen Choudhury –
Dipak Sen Choudhury has a PhD in Engineering from Indian Institute of Technology, Kharagpur. He has over 40 years of experience in the energy storage industry. During this time, he has worked successively with Chloride, Shin Kobe Battery, and East Penn Manufacturing. Currently, Dipak is the President of R&D of Exide Industries Limited.