COMPARATIVE STUDY OF BATTERY TECHNOLOGIES IN SOLAR ENERGY STORAGE
Abstract
The accelerated global deployment of solar photovoltaic (PV) systems has highlighted the crucial role of energy storage technologies in mitigating the intermittency and variability inherent to solar generation. This study presents a comprehensive comparative analysis of key battery technologies for solar energy storage applications, including conventional lead-acid, advanced lithium-ion, nickel‐based chemistries, and emerging flow- and hybrid-battery systems. Performance metrics are examined in terms of energy density, depth of discharge, cycle life, round-trip efficiency, cost per kWh, temperature, environmental resilience, and end-of-life recyclability. For example, recent reviews highlight that lithium-ion batteries offer high efficiency, stronger durability profiles, and favorable maintenance characteristics, making them highly suitable for residential and commercial PV-coupled storage. Flow batteries (e.g., vanadium redox, zinc-bromine) are shown to offer exceptional scalability and long cycle life for larger grid-scale solar deployments, albeit with lower energy density and higher upfront containment costs. The review further explores life-cycle and environmental impacts, noting that mature lead-acid systems still play a significant role in off-grid solar storage in developing regions, thanks to their low capital cost, but suffer from shorter cycle life and lower depth of discharge. The comparative analysis reveals that no single battery technology stands out as universally optimal; rather, technology suitability is strongly contingent on system scale (residential vs utility), deployment conditions (temperature, load profile), and economic constraints. The study concludes by recommending a decision framework for selecting appropriate battery storage technologies in solar applications, emphasizing integration strategies (e.g., hybrid battery architectures), active battery management systems, and technology lifecycle planning to maximize reliability, sustainability, and cost-effectiveness in global solar energy systems.
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