Grey Green has recently been awarded a 10kW Rooftop Solar PV project by Triocon Consulting Engineers on the extension to their office building in Century City. The major components used for this installation were Solar World PV panels, an SMA inverter and a Schletter roof mounting structure. The installation has now been completed with commissioning to follow once the balance of the construction works is complete.
Grey Green was appointed by Project 90 X 2030 to install a 6kW grid-tied Solar PV system at Sibongile Children’s Centre in Khayelitsha. The system is designed to currently not feed back into the grid. It is expected to cover at least 30-40% of the centre’s daily energy consumption. Top quality panels and inverters were selected to ensure the longevity of the system.
Grey Green is currently busy completing the installation of this turnkey 37.5kW rooftop grid-tied Solar PV system. The system was designed such that our client can incrementally add more panels with minimal effort as time goes by and savings are realized.
Grey Green’s assessment dealt with each of the client’s 10 buildings at different sites around the country as follows:
Perform detailed electricity consumption assessments, determined each building’s electrical reticulation boundaries, performed structural assessment of the roof structure of each of the buildings with respect to its ability to accommodate the anticipated wind loads imposed by the fitment of a PV system; performed a site assessment of each building roof with regard to the likely impact of shading, space available and ease of access on the production and maintenance of the system.
Arising from those assessments, we proposed with detailed specifications and budget estimates, the largest yielding PV installation possible, stating R/kWh given a 25 year lifetime for the plant. We also prepared a yield assessment for the proposed PV Plant in terms of solar irradiation and electricity production. Our financial analysis presented the simple cost effectiveness based on the capital cost, operating cost and value of the offset electricity savings over the system life span assuming instantaneous embedded consumption and using the tariff applicable to the building as well as payback period.