The plant is rated at 450 kW/502 kWp and therefore has an AC to DC ratio of 89,6%. It consists of 18 25 kW string inverters which convert DC power from 1620 310 W PV panels into AC power at 400 V, and stepped up to 11 kV and fed into the client’s MV network.
Fig. 1: Costs for commercial scale photovoltaic installations have dropped to below R15/kWp
SANS 50010 Guidelines for measurement and verification of energy savings provides guidance for a more complicated approach but, in principle, uses the following core equation:
Energy saving = (baseline period energy use) – (reporting period energy use) ± adjustments.
In this particular case, the energy saving should be equal to or exceed the upfront guaranteed yield and performance ratio value. The baseline period energy use of the client on the network is not discussed in this report but the demand exceeds the output of the PV plant at all times. No “+/-” adjustments have been taken into account, but an example of this could be network downtime by others.