The plant, for food retailer Migros, consists of four PV systems distributed over six buildings. Altogether, nine flat roofs were covered with 20,039 mono-crystalline 260-watt modules, supplied by Hareon Solar and JA Solar. The total module surface covers 32,000 square meters. The project uses over 60 SolarMax string inverters and 12 central inverters from Swiss manufacturer Sputnik Engineering AG.
The plant also features three compact transformer stations, two of which are directly installed on the roofs of Migros distribution centre at the southern foot of the Jura mountains. That way, Roland Hofmann, Managing Director of TRITEC AG says, "we are feeding, for the first time, solar power directly on the roof into the medium voltage grid. We thus prevent possible losses and bring electrical energy fast and optimally from low voltage of 320 volts to medium voltage of 16,000 volts."
Building the solar plant required removing the roof substrate, replacing it with gravel, as well as installing a high fiber, low aerodynamic mounting system, developed in cooperation with Montavent AG, a Zurich based firm.
As the general contractor, TRITEC was responsible for the complete project engineering including design, logistics, construction planning and coordination, all the way through to commissioning.