Residential heat pumps retrofitted to run on DC power with minimal performance loss

⚡ AI Executive Summary

Researchers at Purdue University have demonstrated that standard residential air-source heat pumps can be modified to operate on DC power with only simple hardware changes and negligible performance degradation. The team built an experimental home equipped with solar PV, battery storage, and dual AC/DC systems to compare operational efficiency under real-world conditions, finding that the retrofit reduced annual electricity costs through lower conversion losses. DC nanogrids offer potential benefits for grid resilience and efficiency, but widespread deployment faces barriers including high costs, lack of standardization, and incomplete DC protection standards. The findings suggest that economic viability improves significantly at larger scales and with higher solar penetration, particularly in cold climates where seasonal mismatch between heating demand and solar generation creates storage value. Further work is needed to validate full-scale deployment and refine cost models for practical adoption.