Following in-depth discussions with the Distribution Network Operator (DNO), it became apparent that there would be significant extra costs involved to upgrade the connection (an increased in cable specification to satisfy the DNO) for a large installation. We recommended a slightly smaller installation, as the upgrade would have cost several thousand pounds and would have also required additional metering to be installed. The balance was found with a 42.12kW system and we were able to use a thinner cable to connect the system to the metered supply and avoid increased installation costs. Given the distance was 150m for the cable run, there were substantial cost savings to be made through using this approach.
By installing the panels in rows, it was also possible to install without the need to cover any clear roof sheets, avoiding obstructing light from entering the shed.
The inverters were wall-mounted externally within a purpose-built weather-proof structure. Each pair of panels has a power optimiser connected to ensure that the system delivers the maximum amount of electricity. From these the DC cables are connected to the inverters, and a new AC cable then runs across the other buildings back to the connection point. Merryfield Farm is now benefiting from an tailored design resulting in a good return on investment, thanks to the know-how of the experts at NWT Energy.