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5 KW ROOFTOP PV PLANT IN PERNIK

Egnatia Bulgaria designed and implemented in Pernik town a 4.9 kWp rooftop PV plant with nominal power of 4 kW. The neccessary area of the inclined roof was 35 sq.m. in SW direction. The inclination of the roof is 27 degrees to the horizon. As a supporting structure for the PV modules were used 40/60mm hot dip galvanized steel profiles. They were mounted to the roof structure through Z-brackets.

Modules are produced by Renesola company - 20 pcs of model JC245M -24/Bb 245wp. For the purpose of transformation of DC to AC we used inverters of the world's leader SMA - monophase model SB 4000Tl -21 with nominal power of 4.0kW. It's connected to 2 strings - 14 moduled and 6 moduled. Each string is connected in series.

In software simulation on PVSYST the results are approximately 6.7 МW/year. According to the actual price at the moment (381.18 BGN/МW) the investment return period will be about 6 years.