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.
Following our discussions with the distribution network operator it became apparent that the extra costs involved in upgrading the connection reached the point where an alternative should be considered. This was for several reasons:
- Because the upgrade WPD were requesting was going to cost several thousand pounds.
- Following the cable upgrade, they would also have required “CT metering” to be installed – adding further costs at the installation phase and also resulting in higher ongoing costs.
- By reducing the total system size, were are able to use a thinner cable to connect the system to the metered supply. Given that this was over a distance of approximately 150m, there were substantial cost savings to be made through using this approach.
- With the 42.12kW system we no longer needed to install a new kiosk
By installing the panels in rows, it was also possible to install without the need to cover any clear roof sheets, thereby not obstructing light from entering the shed.