Determination of yearly performance and degradation rate of electrical parameters of amorphous silicon photovoltaic module in Minna, Nigeria


  • Matthew Samuel Oluwatobi federal university of technology, minna.
  • Ezenwora Joel Aghaegbunam federal university of technology, minna
  • Eichie Julia Ofure federal university of technology,minna
  • Alilu SaliuOlakanmi federal university of technology, minna
  • Ahmadu Aliyu federal university of technology, minna





Amorphous, Module, Photovoltaic.


There is need for accurate knowledge of degradation rate and lifespan of photovoltaic (PV) module in every location for an effective solar PV power system. Outdoor degradation analysis was carried out on amorphous silicon PV module rated 10 W using CR1000 software-based Data Acquisition System (DAS). The PV module under test and meteorological Sensors were installed on a metal support structure at the same test plane. The data monitoring was from 09:00 to 18:00 hours each day continuously for a period of four years, from December 2014 to November 2018. Annual yearly averages of the performance variables were carried out to ascertain the degradation rate and lifespan of the module. The module performance for the four years of study was compared with Standard Test Condition (STC) specifications. The maximum power achieved at 1000W/m2 for the four years of study were 0.652W, 2.186W, 2.078W, and 1.812W representing 6.52%, 21.86%, 20.78% and 18.12%of the manufacturer’s 10W specification. Module efficiency at 1000W/m2 for the four years of study is 2.25%, 7.56%, 7.19%, and 6.27% respectively as against the manufacturers STC specification of 33%. Accordingly, Module Performance Ratios for the PV module investigated were 0.07, 0.23, 0.22 and 0.19 respectively. For the Rate of Degradation (RoD), it was observed that Open-Circuit voltage (Voc), Short-Circuit Current (Isc), Power-Output (P), Maximum Power (Pmax), had an average yearly degradation rate of 0.73V, 0.010A, 0.040W, 0.050W respectively for the four years of study. To also determine the lifespan of the module, an empirically determined statistical model given as YEAR = 3.36 - 0.237 Voc (v) - 71.5 Isc (A) + 8.07 Power (W) was fitted to the observed data to predict the lifetime of the module at any given year.



[1] Dunlop E. & Halton D. (2006).The performance of crystalline silicon photovoltaic solar modules after 22 years of exposure. Progress in photovoltaic. Research applications, 7:16-23.

[2] René, J. (2005). Introduction to polymer solar cells. Eindhoven University of Technology, Netherlands. 3Y280

[3] Azhar G. & Abdul M. (2012).The performance of three different solar panels for solar electricity applying solar tracking device under the Malaysian climate condition. Energy and environment research, 2: 235-243

[4] Duke R., Graham S., Mark H., Arne J., Daniel M., Osawa B., Simone P. & Erika W. (1999). Field performance evaluation of amorphous silicon (a-si) photovoltaic systems in kenya: methods and measurements in support of a sustainable commercial solar energy industry. A Project of Energy Alternatives Africa (EAA) and Renewable Appropriate Energy Laboratory (RAEL) and Energy and Resources Group (ERG), University of California, Berkeley

[5] Rakovect, J. & Klemen, Z. (2011).Orientation and tilt dependence of a fixed PV array energy yield based on measurements of solar energy and ground albedo- A Case Study of Slovenia. Progress Report on Photovoltaics: Research and Applications, 13: 42-51.

[6] Manuel V. & Ignacio R. (2008).Photovoltaic module reliability model based on field degradation studies. Progress report on photovoltaics:research and applications, 10: 825-1002

[7] S.J. Strong & W.G. Scheller, (1991). The Photovoltiac Room. 2nd ed. Sustainability Press, Massachusetts.

[8] P.E. Ugwuoke, F.I. Ezema& C.E. Okeke (2005). Performance Response of Monocrystalline PV Modules to Some Meteorological Parameters at Nsukka, Nigerian Journal of Space Research, 3 (2), 63-69.

[9] Ezenwora, J.A; (2016).Development of a prototype photovoltaic power system based on characterization and performance evaluation of photovoltaic modules in Minna, Nigeria.PhD Thesis, Department Of Physics, Federal University of Technology, Minna .pp 45-140

[10] Carr A. (2005). A detailed performance comparison of pv modules of different technologies and the implications for the pv system design methods. Phd thesis; murdock university. Western Australia.

View Full Article: