Project Cardiff 1
Total System Price
Estimated Annual Electricity Bill Savings
Annual Electricity Generation
The installation of this system will save the client approximately £21,818 in electricity per annum and will pay for itself in just under 7 years. Excluding O&M, this will lead to a net saving through on-site electricity generation over the systems 25-year life cycle of £545,466.
The design displayed above represented the render of the site’s preliminary system design before the initial site visit, construction design, equipment procurement and installation.
During daytime hours the system may produce more energy than required on site, and so excess energy is sold to the grid.
During daytime hours the system may not produce enough energy required to fully power the site. In this case excess energy is purchased from the grid to supply the deficit.
As solar PV does not generate electricity outside of sunlight hours, no power is generated, and all electricity must be drawn from the grid.
Solar PV produces no CO2 emissions when generating electricity, creating a completely clean source of energy. The table below demonstrates the estimated benefits provided by this system over its 25-year life cycle.
Estimated tonnes avoided CO2
Car miles avoided
Long haul flights avoided
The solar panel array is divided into three separate areas called sub-arrays. Each sub-array supplies their own inverter.
The inverters convert the DC current produced by the solar panels into AC current suitable for supply to the client or export to the grid.
The system will produce a maximum average of 5.15 kWh/ kWp/ day in June, and a minimum average of 0.81 kWh/ kWp/ day during December. This is because production is correlated to irradiance from the sun, which is highest during the summer in the UK.
The system will produce a total of 186,191 kWh per annum, achieving an overall performance ratio of 0.882.
System based losses (a completely normal characteristic for any energy generation system) will reduce the energy available to be consumer or exported to the grid creating a final usable production value of 182,451 kWh per annum. This is the final value provided to the client and used for detailed modelling.
A single line diagram provides a simple representation of the electrical system. This forms part of the design which is shared with the DNO (District Network Operator).
After the team has established the building specifics via a site visit, the detailed redesign is finalised allowing the installation to begin.