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In this article, let me introduce some knowledge about the details of the PV inverter system. I hope you could gain something after reading it.
1. the photovoltaic cell is a high-resistance current source, the battery is low resistance voltage source. This is a direct interpretation we can short-circuit components, but do not short-circuit the battery.
2. when the battery is covered, becomes equal to the objective of a large resistance, if not draining quickly fever. This is also the fundamental components and activation of the bypass diode switching principle.
3. STC (standard test condition, namely, the standard test conditions) and differential NOCT (Nominal Operating Cell Temperature, nominal operating temperature of the solar cell), in addition to the difference in value of the established several parameters, NOCT introduced 1m / s wind speed parameters, its purpose is to fit more practical work components of output power.
4, 25 degrees Celsius STC standard state under the definition of the components, a component operating temperature rather than ambient temperature. So when you calculate the temperature on the minimum operating voltage to plus 25 degrees panels work at room temperature for additional heating. However, when calculating the temperature on the maximum open circuit voltage, is not the work of 25 degrees plus warming. This 25 degrees for more than 3kW computing project, is a very considerable errors.
5. the same size of the same material (mono / polycrystalline) the same power rating of components, if not the same conversion efficiency standard, is a lie. It is also a law, no exceptions.
6. the working voltage of the open circuit voltage components and assemblies maximum power point is a constant relationship 0.8, very close. The relationship between initial estimate inverter and the reasonableness of the system structure is very important and convenient. While for the MPPT algorithm design it is of great significance.
7. no sun or drizzle cloudy days, the system output power is very small, in fact, the components of the open circuit voltage or the operating voltage is still very high, and even full! Australia Many cloudy indoor replace the inverter installers therefore electric shock. Remember, cloudy, components may not output, but not mean it is dead. This is an often overlooked common sense.
8. if the overall structure among the things in the desired number of components are the same, then you need not worry about the problem of displacement voltage can be safely carried out in parallel. Basically as long as the light intensity 50W / m2 or more components can work, and the output voltage. This explains the inverter to start early, but the real power output lags behind the phenomenon over time.
Knowledge is more than eight photovoltaic inverter system designers tend to get overlooked, but yet extremely important part. We hope that through this article summary and description, so that everyone can keep in mind this knowledge in the design process less take some detours.
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