23/07/2026
The proposed solution is to retain one string of the original 7 × 310W panels and replace the second string with 5 × 455W JA Solar panels.
● Original array capacity: 4,340W
● Revised array capacity: 4,445W
This brings the system capacity as close as possible to the original specification while avoiding the need to replace the existing inverter. Retaining the inverter delivers a significant cost saving, as inverter replacement would add substantial equipment, labour, and commissioning costs. It also avoids the additional expense and disruption associated with a full system redesign, which would likely require further electrical alterations and a more extensive installation scope.
Due to the different dimensions and mounting points of the newer JA Solar panels, replacement roof hooks and mounting rails are recommended to ensure correct installation and structural integrity. Although these are marginally outside the manufacturer’s preferred mounting zones and would have benefited from new rails and hooks, this approach remains the most economical option and avoids the much higher cost of a complete redesign.
Overall, this approach provides a practical and cost-effective solution that maximises compatibility with the existing system, maintainsw performance close to the original design, and delivers clear savings compared with inverter replacement or a full system redesign.
