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    York Minster solar array: performance, safety and design notes for engineers

    December 17, 2025|

    Reviewed by Tom Sullivan

    York Minster solar array: performance, safety and design notes for engineers

    First reported on The Construction Index

    30 Second Briefing

    A 184-panel rooftop solar array on York Minster has generated over 42,000kWh in six months, meeting more than 80% of the cathedral’s peak demand, saving nearly £20,000 in electricity costs and offsetting eight tonnes of CO₂. Specialist installer Associated Clean Technologies used SolarEdge DC-Optimised Inverters with S‑Series Power Optimizers so each module operates independently around shading from pinnacles and towers. Fire risk on the historic structure is managed via SafeDC rapid DC voltage reduction, Sense Connect hotspot detection and a Firefighter Gateway linked to the Minster’s alarm system for full-array shutdown.

    Technical Brief

    • SolarEdge Power Optimizers are mounted beneath each module, providing panel-level control and protection.
    • ACT’s design isolates shading losses to individual modules, critical around pinnacles and towers.
    • SafeDC automatically drops string voltage to touch-safe levels whenever grid or inverter power is cut.
    • Rapid de-energisation enables safe roof access for fire crews on a complex, high, heritage structure.

    Our Take

    Within our 276 Infrastructure stories, UK-based sustainability pieces tend to focus on transport and utilities, so a heritage asset like York Minster adopting a 184-panel array signals that listed and ecclesiastical estates are starting to contribute materially to the Church of England’s 2030 net-zero pathway.

    Offsetting 8 tonnes of CO₂ in six months from a single rooftop suggests that rolling similar systems across York Minster’s 7 ha estate could create a small but visible carbon ‘campus’, which may strengthen the Chapter of York’s case in future planning and funding discussions for fabric repairs and energy upgrades.

    The use of SolarEdge and ACT on a complex, fire-damaged structure that once took four years to repair will be watched by other custodians of sensitive buildings in the UK, as it demonstrates that modern PV and safety systems can be integrated without materially increasing fire or lightning risk profiles.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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