Beware of the siren song!
When developing photovoltaic power plant specifications, some unscrupulous installers predict annual productions worthy of installations in the Bahamas or the West Indies. Other companies call you through call centers to tell you that they represent significant energy providers, that they have examined your satellite roof and that this same shelter will provide you with optimal performance. They will, of course, do the necessary to quickly get an appointment at your home to get a new contract.
The quote, the material: the points to control
On the quote, be careful about the annual production announced. Try to compare with other facilities in your area. For this, you can consult sites of producers like BDPV, national associations like HELPFUL or local (Solar in North …). Do not hesitate to inquire about the info-energy spaces to visit private facilities.
The quality of the material
With the steady growth of the photovoltaic sector, we now find everything on the market. So be careful about the variety of the equipment and brands offered (photovoltaic solar panels, inverter …).
What is the power of the installation?
The plant has a surface of 20 m2. It consists of 14 polycrystalline sensors of 175 Watts/peak, for a total power of 2450 W / C, It is oriented south / east (20 °), and its inclination is 30 °.
Which material did I choose?
The material is entirely German: Conergy for the panels and SMA for the inverter. It cost 17,657 euros in 2004, but I benefited from regional aid and 15% tax credit.In the end, I paid 5 187 euros.The small peculiarity, I consume the current product, and I only sell the surplus to ERDF (40%) at the price of 0.15 euros (2004 contract). The amortization time will be 16 years or less if the amount of electricity increases.If I had built my installation in 2010, with the tax credit of 50% on equipment TTC, VAT on labor and equipment at 5.5%, local aid and any aid from ANAH, I estimate that the time of return on investment would have been much faster (5 to 7 years).
What is the efficiency of the installation?
Since 2004, its annual output is 1000 kWh produced by installed kwc, which is well above the regional average. Indeed, according to the Ademe, the yield in the North of France is 900 to 950 kWh produced by installed kwc.