Solar Energy Panels – An Overview of a Solar Energy Panel.

The panel offers support for a variety of different PV cells and the amount of electrical output will depend on the number of cells and the size of the cells, the conditions of the environment, and of course the electric interconnection of those cells.

When it comes to the output of a specific solar electric panel, there are four things that affect how much energy is put out, including the temperature of the cell, how efficient the photovoltaic cells are, load resistance, and of course, solar irradiance as well.

In regard to the efficiency of the photovoltaic cells, this is actually set during the manufacturing process of the cell. Load resistance decides where the panel will operate on the voltage and current curve. Then last of all the solar irradiance usually determines the current that will be generated in a particular area. So, when the brightness of the sun is increased, then the power and output voltage will decrease. So, it is best to keep the solar electric panels mounted in the areas that are the sunniest.

Shading and Photovoltaic Cells

Any type of shading can reduce the light that reaches the cells significantly. The shading of any solar panel will end up in the power output being reduced. Since all the cells are connected, then the weak cell will bring down the other cells as well.

So, even if just part of a cell is shaded, it can decrease the power of all the cells. In order to avoid having a drastic reduction in the power output, it is important that shade is avoided if at all possible.

If you have array voltages that are higher than 24 volts, then it is important to make sure that you use bypass diodes around every single module. While using these diodes can help to keep a system from failing, it will not always keep it from losing energy production as a result of shading.

So, before you install your PV array, be sure that you check to make sure there will be no potential shading. Even after it is installed, make sure that you maintain it to keep branches or weeds from getting in the way and causing shade.

It is important that you look closely at the junction box before you purchase a solar electric panel and make sure that making the needed connections is easy. Make sure that the junction box is quality and that you are able to connect the bypass diodes if you need them.

More than likely maintenance is going to be needed on a regular basis, so having a circuit breaker or a switch is important so you can isolate the PV array. Usually every load is isolated by circuit breakers as well. There should also be fuses used to make sure that current carrying conductors are all protected as well. Always be sure that PV breakers or slow blow fuses are used as well.

Orientation of Solar Energy Panels

As long as you keep the array’s azimuth at about plus or minus 20 degrees of true south, then the production should not be significantly reduced. There are some arrays that are put a bit west of true south, which helps to make the most production during the afternoon, which helps to meet the time when demand is the highest.

However, over a full year, using a tilt angle that is also near the latitude angle will help you make sure you get the best average energy throughout the entire year. Of course, the orientation will highly depend on your exact location and your choice of orientation will drastically affect the energy production of your solar energy panels.

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