PID stands for “positive temperature coefficient” and refers to the tendency of some solar modules to generate more power at higher temperatures than they would produce at a room temperature. In most climates, this doesn’t pose a problem—but it can be an issue in places that experience hot weather with high humidity or under certain conditions where there’s reduced airflow around panels (for example, on roofs).
What is the PID effect?
PID stands for positive temperature coefficient. It’s a phenomenon that occurs in all solar panels, but it is more common in high-performing modules. The PID effect causes the power output of a solar module to decrease as the temperature increases. This means that if you install your panels in an area with hot summers and cold winters (like Arizona), you may see less energy production during those extreme months than you would if you installed them somewhere else like Colorado or Florida where temperatures are more moderate year-round.
What are the causes of PID?
PID is caused by a poor quality connection between the solar module and the module frame. This can be caused by a number of factors, including:
- A poor quality backsheet (the layer on top of your solar panel that holds it together)
- A poor quality junction box (where your wires connect to)
The best way to avoid PID is to make sure that all components are made with high-quality materials that have been thoroughly tested before being installed on your home or business.
How does PID affect the power output of a solar module?
The PID effect reduces the power output of a solar module. This means that if you have a 100 watt solar panel, it may only be putting out 80 watts after taking into account PID.
The reduction in voltage and current is caused by an increase in temperature, which lowers the efficiency of your photovoltaic cells. For example: if you have two identical panels with different insulations (such as glass vs plastic), then the one with glass will be hotter than its plastic counterpart because heat cannot escape as easily through glass compared to plastic; therefore, more energy must be spent cooling down this hotter panel before it can produce electricity again–meaning less overall power output for both panels!
Different techniques for preventing PID
- Use a PID-resistant module. This is the easiest and quickest way to prevent PID from happening. If you’re buying new solar panels, look for ones that are designed to resist this effect.
- Use a PID-resistant controller. If your existing system doesn’t include a PID-resistant module and you want to add one, it may be possible to do so by replacing the current controller with one that has built-in safeguards against overvoltage and undervoltage conditions caused by rapid temperature changes in the panel array itself or its environment (e.g., shade). The key here is finding an appropriate product; many controllers marketed as “solar ready” aren’t really designed for long-term use under these conditions–they’re better suited for seasonal use or intermittently installed applications like boondocking (camping without hookups). You may need someone who knows what he’s doing when installing them!
Many factors including insulation, climate and temperature contribute to the PID effect.
PID effect can be caused by insulation, climate and temperature. Insulation can trap air in the panel, which reduces its ability to conduct electricity. Climate can cause moisture to build up on the surface of your solar modules, creating a barrier between them and their neighbors. Temperature changes can also affect how well a module conducts current–as they heat up they become less conductive while they cool down again after being exposed to direct sunlight for awhile (this happens naturally with most materials).
In conclusion, PID is one of the most important factors that affect solar module power output. It can be prevented by using insulation, climate control and temperature regulation techniques. However, it may still happen in extreme weather conditions like hot summers or cold winters when there is no other choice than waiting for the temperature to return to normal before reusing the system again.