76.68 kWp Solar PV Design for a Multi-Flat Residential Development in Sutton
PVSol rooftop solar PV layout for a 76.68 kWp system designed for a multi-flat residential development in Sutton.
Nortcel was asked to prepare a solar PV design for a multi-flat residential development in Sutton, covering 40 flats, landlord supply and shared residential electricity use.
The project was modelled as 2 separate rooftop PV designs, allowing for multiple shared electricity groups, SolShare units, landlord supply and separate inverter arrangements.
The challenge
The design needed to follow the existing project intent while responding to the actual roof constraints. The available roof space had to be used carefully, with east-west flat roof mounting, maintenance walkways and rooftop obstructions considered during the layout.
The consumption profile was based on 2,400 kWh / flat, with an additional landlord supply allowance. Future-proofing the system was also a requirement. This meant the system needed to support shared residential demand rather than a single commercial load.
The solution
Nortcel developed a combined 76.68 kWp roof-mounted solar PV design across the residential blocks.
The design used 142 AIKO modules, 4 SolarEdge inverters and allowed for 3 SolShare units across the shared electricity arrangement. The PV layout used an east-west flat roof mounting approach with K2 mounting components and maintenance access routes allowed.
Project results
The combined PVSol simulations estimated annual solar generation of 68,323 kWh / year.
The model showed 31,697 kWh / year used onsite and 36,625 kWh / year exported to the grid. This resulted in a combined own power consumption of approximately 46.4% and combined self-sufficiency of approximately 31.2%.
Estimated avoided emissions were 12,085 kg CO₂ / year.
Energy profile
Annual energy profile showing PV energy use, grid export and shared residential electricity coverage for the 76.68 kWp rooftop solar PV design.
The energy profile shows how the annual PV generation is split between onsite use and grid export. It also shows how much of the modelled shared residential electricity demand is covered by solar PV compared with grid supply.
Design outcome
The design showed that the development could support a meaningful rooftop PV system for shared residential electricity use, while maintaining a practical layout around roof constraints and access requirements.
The output provided a clear basis for client review, equipment coordination and the next stage of project development.
Key figures
System size: 76.68 kWp
Annual generation: 68,323 kWh / year
Modelled annual consumption: 101,600 kWh / year
Own power consumption: 46.4%
Self-sufficiency: 31.2%
Grid export: 36,625 kWh / year
CO₂ avoided: 12,085 kg / year
PV modules: 142 AIKO modules
Inverters: 4 SolarEdge inverters
SolShare units allowed: 3
Battery storage: Not included
