Cathedral Walk in Liverpool is a residential block containing 24 maisonette flats. The building presented a strong opportunity to introduce renewable energy generation to support residents with lower electricity costs while reducing carbon emissions.
We were engaged to develop a solar PV design that could be replicated across every property, ensuring a consistent and efficient approach to installation across the entire building.
Working alongside Swindells Roofing, we designed a system that maximised the available roof space while maintaining a practical and scalable layout suitable for multi-dwelling properties.
The final design provides 2.13 kWp of solar generation per flat, delivering a combined system capacity of approximately 51 kWp across the building.
At Cathedral Walk, the project required:
A standardised solar solution that could be repeated across all 24 flats
Careful design of panel arrays across north and south roof elevations
A safe and compliant method of routing cabling and inverter equipment within a shared loft space
Independent connection of each PV system to the individual electrical supply of each flat
Compliance with UK electrical and grid standards including BS 7671 and G98 requirements
In addition, the system needed to deliver strong performance while fitting within the physical constraints of the roof structure.
Our Solution
We developed a modular solar PV design, allowing each flat to benefit from its own dedicated system.
Each property was equipped with:
5 x LONGi 425 W monocrystalline solar panels
1 x SolaX X1-Mini inverter
Roof-parallel mounting with a 23° inclination
Optimised panel placement across both north and south roof sections
This approach allowed the system to be deployed in 12 paired panel arrays, ensuring an efficient use of roof space while maintaining clear installation zones and access routes.
The design also incorporated:
Individual generation meters within each flat
Dedicated AC isolators and protection devices
Safe inverter installation within the communal loft space
A consistent electrical configuration across all properties
By standardising the system design, the project delivered a solution that is both efficient to install and simple to maintain over time.
Performance
Solar modelling using PV simulation software forecast strong generation performance for each system.
Each flat benefits from:
2.13 kWp solar PV system
1,578 kWh annual solar generation
Approximately 49.6% on-site consumption
Around 214 kg of CO₂ emissions avoided per year
Across the entire building, the installation provides:
51 kWp total solar capacity
Significant reduction in grid electricity demand
Long-term energy savings for residents
Through careful system design and collaboration with the installation team, we supported the delivery of a solar solution that:
Provides renewable energy generation for every flat
Reduces electricity costs for residents
Supports carbon reduction goals
Creates a scalable model for similar residential developments
