Commercial Rooftop Windhoek

Site Overview
LocationWindhoek, Namibia
Coordinates22.6° S, 17.1° E
Average global irradiance2,363 kWh/m2/yr
Average temperature19.9 °C, 67.8 °F
Average precipitation362 mm/yr, 14.3 in/yr
Technical Overview
Date onstreamNovember 2012
System capacity302.4 kWp
Panel typeSF150-S (150 W)
Number of installed panels2,016
Tilt angle, orientation4°, 0° south
Expected output586,958 kWh/yr
Total CO2reduction330,490 kg/yr, 728,598 lbs/yr
Inverter18 x SMA STP 17000 TL-10
Financing Bank
Private Investment

HopSol provides turn-key solutions for photovoltaic power plants. HopSol´s head office is located in Switzerland and the headquarter of HopSol Africa (Pty) Ltd has been established in Windhoek, Namibia, for its customers in southern Africa, where they have specialized in fulfilling the requirements of the solar industry for desert regions. Furthermore, HopSol acts as a wholesaler of all relevant parts for photovoltaic solar power solutions. Superior quality of modules and balance of equipment, along with engineering experience for desert conditions are crucial success factors.

This system on the rooftop of a Woermann Group supermarket with more than 300 kWp, is currently the largest PV installation in Namibia. Commencing in November 2012, it is expected to produce almost 600,000 kWh of electricity annually, covering approximately 40 % of the energy needs of the supermarket. This investment confirms the ambitious “Green Strategy” of the Woermann Group, to be the first Namibian retailer, who supports electricity from renewable sources and gain independence from the steady increasing price of electricity in Namibia.

The special challenge of this system was mainly the hot climate conditions in Namibia. HopSol has decided consciously for CIS thin-film modules for this commercial installation due to their low temperature coefficient. Even with the high temperatures of this region, the Solar Frontier CIS modules produce up to 15 % more electricity than comparable crystalline modules. This shows that the Solar Frontier modules yield higher output even under non-optimal conditions, such as high temperatures or the four degrees flat tilt angle of this PV system.