Commercial Rooftop Otjiwarongo

Site Overview
Location Otjiwarongo, Namibia
Coordinates 20.5° N, 16.7° E
Average global irradiance 2,360 kWh/m2/yr
Average temperature 20.9 °C, 69.6 °F
Average precipitation 453 mm/yr, 17.8 in/yr
Technical Overview
Date onstream February 2013
System capacity 249.6 kWp
Panel type SF160-S (160 W)
Number of installed panels 1,560
Tilt angle, orientation Various
Expected output 515,923 kWh/yr
Total CO2reduction 290,000 kg/yr, 639,000 lbs/yr
Inverter 15 x Sunny Tripower STP 17.000 TL-10
Financing Bank
Bank of Windhoek

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.

In early 2013, HopSol installed about 250 kWp on the roof of a SPAR supermarket in the town of Otjiwarongo, Namibia. Theo Borstlap, the owner, was convinced by HopSol’s technical approach, to generate high yields even in hot regions by choosing the right technology. HopSol installed more than 1,500 Solar Frontier CIS thin-film modules on different rooftops of the supermarket building in order to supply the supermarket with self generated energy. The owner of the installation expects an annual electricity output of about 515,000 kWh and a CO2 offset of 290 tons. In doing so, Theo’s Superspar follows the trend towards green energy as first Namibian SPAR supermarket.

Solar Frontier’s CIS thin-film modules were HopSol’s first choice to account for the various orientations and inclines of the building’s roof, as well as Namibia’s hot climate. Even when not at their optimal tilt angle, CIS modules generate high yields due to their excellent low-light behavior. Their lower temperature coefficient also results in higher yield in the hot African ambient temperatures compared to crystalline silicon modules – in some cases up to 15%.