In its most basic form, all that is necessary for a solar power system is a board to pick up the sun's energy and a battery to store that electricity. When the sun is shimmering, the panel will create a voltage greater than that of the battery, provoking the battery to be energized. Almost all panels consists of a blocking diode (an electrical component that will only let electricity to move in one direction- parallel circuit) making sure that the battery would not discharge by means of the panel whenever the sun is not shining as well.

There are a couple of various kinds of diodes which may have an important role in the functioning of solar system panels (essentially the diodes themselves can be the same because it is the method wherein they are utilized which has two possibilities). First let us confirm what a diode is and what it exactly does.

What is a Diode

A diode utilizes a semiconductor material, normally silicon, with two terminals connected. Its function in it is a most basic form to permit open circuit voltage to move in one direction but not the other. The diagram to the right reveals a simple setup with two panels charging a battery (for simplicity no controller is shown) with a blocking diode in series with the two panels, that can be also wired in series. Every time the sun shines, so long as the voltage made by the two panels is beyond that of the battery, charging will occur.

But, in the dark, when no voltage is being generated by the panels, the voltage of the battery would cause a current to run in the opposite direction by means of the panels, discharging the battery, if it weren't the blocking diode in the circuit. Blocking diodes will likely be of benefit in any system utilizing solar panels to charge a battery. Blocking diodes usually are contained in the construction of solar panels so further blocking diodes are not required.

By-Pass Diodes

Now let's consider what will happen if one of the panels in the above diagram is shaded. Not merely will that panel not be generating any significant power, however it will also have a high resistance, blocking the movement of power generated by the unshaded panel. This is where by-pass diodes become very important as shown in the diagram to the right. Now, in the event that one panel is shaded, the current produced by the unshaded panel can flow through a by-pass diode to prevent the high resistance of the shaded panel.

By-pass diodes will not be of usage unless panels are connected in series to generate a higher voltage. They are almost certainly to be of benefit where an MPPT Controller or String Inverter entails panels connected in series to generate an open circuit voltage well above that items minimal input voltage. Some solar panels are created with the cells divided into groups, each group having a built-in by-pass diode. Shading of part of a panel can be a result of a tree branch, debris, or snow.

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