Improve the photovoltaic yield

Tips for improve the performance of the photovoltaic systemand increase electricity production.

Increase energy production electricity from your systemphotovoltaicit is essential to amortize the high costs of installing and purchasing solar cells.

For increase the production of electricity routine maintenance of the photovoltaic system must be performed. As is clear, the performance of photovoltaic panels depends on a large number of factors that can be intrinsic to the materials used and external factors. Once we have chosen the technology to install, the only factors we canto monitorisimprovewithin certain limits, they are external ones.

First of all, the exhibition! Check the insolation of the modules; at the time of installation the technicians, if they have done a good job, will have studied the solar movement throughout the year, providing for any periods of shading. The yield of photovoltaic panels in winter is not the same as expected for the summer. During the day, usually, the moments of least productivity occur in the morning or late afternoon.

Make sure that no detail has been overlooked: the shadow of a light pole, a tree or a building. One photovoltaic module in the shade it can decrease the energy performance of the entire system. If it is not possible to eliminate the obstacle that produces the shadow, move the photovoltaic modules involved.

With the maintenance work on the photovoltaic system, do not forget cleaning: dust, foliage and debris can greatly reduce theyield of a photovoltaic system. In theory, it should be the rain that ensures good cleaning, but it is often the rain itself that brings dust and dirt to the system.

Monitor the cleanliness of yours photovoltaic system especially after days of strong wind. Cleaning a photovoltaic system is not as easy as you might imagine, especially if it is a solar roof. To clean a photovoltaic roof it is recommended to use a special brush with telescopic handle, there are many on the market brushes for cleaning photovoltaics, some of these provide for the possibility of cleaning by spraying demineralized water so as to make cleaning operations easier.

It is important to use demineralized water to avoid limescale deposits. The brush can be combined with a non-aggressive universal detergent, however we recommend using the detergent only in the case of stubborn stains (bird droppings can be very stubborn!). For more advice:how to clean solar panels.

If the photovoltaic system does not produce or the yield has dropped, in addition to the classic cleaning, interventions such as:

  • Check the inverters with possible revision
  • Performance check of the photovoltaic generator
  • Check the electrical connections and wiring
  • Checking the status of the modules with the use of a thermal imaging camera (thermographic analysis: thermography on solar panels)

For all advice about the correct maintenance of a plantwe refer you to the pages:maintenance of the photovoltaic system and maintenance of solar panels.

Another factor that greatly affects the yield of photovoltaics is the temperature. We talked about this at length on the page dedicated to the so-called NOCT (for further information:NOCT Photovoltaic). The acronymNOCTis the acronym for Nominal Operating Cell Temperature, the nominal working temperature of a photovoltaic cell. Overheating of photovoltaic cells gives bad results in terms of yield causing a sharp drop in electricity production. Today, the problem of overheating is partially solved with the use of latest generation photovoltaic modules that increase the overall efficiency of the system by exploiting the heterojunction technology. Heterojunction solar modules achieve ayielda record of 25.6% against just 8.5% of amorphous silicon and 16.7% of polycrystalline silicon.

Monocrystalline silicon modules achieve an efficiency of 21% but are strongly affected by the effect of temperature. To understand how much the materials affect theyieldoverall of aphotovoltaic systemI invite you to read the article dedicated toEfficiency of photovoltaic panelswhere we analyze all the intrinsic factors of the materials used that strongly affect the production of electricity.

The use of a solar tracker can increase the yield of a photovoltaic system by up to 40%, an excellent result that is not without compromise: a solar tracker requires greater maintenance and also an increase in installation costs: the modules are mounted on supports equipped with an electric motor able to follow the movement of the sun so as to always find the right position to guarantee the best possible exposure.

You may also be interested in Cost of a Photovoltaic System

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