Facts about Photovoltaics in Germany, P.48-49National Renewable Energy Laboratory (NREL): http ://www.nrel.gov/ncpv/images/efficiency_chart.jpgBloomberg: The New Energy Outlook 2016 Solar, P.5
, P.48-49National Renewable Energy Laboratory (NREL): http://www.nrel.gov/ncpv/images/efficiency_chart.jpgBloomberg: The New Energy Outlook 2016 Solar, P.5