At IPEC 2026 (IEEE ECCE Asia), our researchers at the Aalborg University presented new research from the SOLARIS Project focused on extending the lifetime and reliability of photovoltaic (PV) inverters.

The study investigates the impact of the integration of a redundant leg into three-phase PV inverter topologies. Using a dynamic load-sharing strategy, electrical and thermal stresses are distributed across inverter legs, reducing semiconductor thermal loading and wear-out.

Using mission profile-based electrothermal modeling, lifetime estimation, and Monte Carlo reliability analysis with real weather data from Denmark, we evaluated the long-term impact of this approach.

Our results show:

• Up to 10°C reduction in semiconductor junction temperature
• Up to 23% increase in inverter lifetime
• Improved system reliability and availability
• Enhanced fault-tolerant operation

These findings support the SOLARIS vision of developing more reliable, sustainable, and resilient renewable energy systems through advanced reliability engineering and intelligent asset management.