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Dual-level hybrid storage design boosts solar efficiency and reduces costs

Source：www.solardaily.com

In an era when renewable energy is reshaping electricity grids, solar photovoltaic (PV) power still faces a core challenge: the sun rarely delivers energy exactly when demand peaks. Aalborg University researchers have introduced a dual-level design for hybrid energy storage systems (HESS) that could make solar power more dependable and economical.
The system integrates lithium-ion batteries with supercapacitors, tackling the intermittency problem while reducing battery degradation. Over a year of testing, the approach cut battery cycling by up to 13 percent, extended battery lifespan, and preserved the system's self-sufficiency without raising operating costs.

The design also stabilized grid performance by controlling power ramp rates and optimizing energy flow between PV arrays and the grid. "By intelligently combining lithium-ion batteries with supercapacitors, we're leveraging the strengths of each technology," the researchers said. "Supercapacitors handle the rapid power fluctuations that typically degrade batteries, while the batteries manage longer-term energy storage needs."

An adaptive filter dynamically distributes power between the two storage types in real time, ensuring each operates within ideal limits. This not only extends component life but also lowers replacement expenses.

Next steps will incorporate more detailed battery aging models and real-world cell testing, alongside refined economic assessments. The team sees the dual-level design as a step toward more practical, cost-effective solar energy storage that can accelerate the transition to clean energy.

by Robert Schreiber
Berlin, Germany (SPX) Aug 08, 2025