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Solar photovoltaic products application needs to be clearly identified

- Dec 26, 2018-

1。 Solar cell peak power

One common problem is that it is considered that as long as there is a sun, the rated power can be output, and the peak power of 100 WP。 If it is irradiated for 10 hours under normal lighting conditions, it will be 1000 WH, that is, 1 kWh, in fact, the solar peak power WP。 Under standard conditions: radiation intensity 1000W/m2, air quality AM1。5, battery temperature prefix=stlns="urn:schemas-microsoft-com:office:smarttags" 25 °C, solar cell output power。 (This condition is about the same as the sun lighting conditions around our usual sunny day noon)


2. Solar power loss

It is often mistaken that the solar cell module output every day will be fully utilized by the load. In time, solar cell module installation has considerable loss, about 15~20%. During charging and discharging, the loss is about 20%. If there is inverter, the loss is more than 10%. In general, solar energy The power generation utilization rate is about 50%. The purpose, all energy conversion process, must follow the law of conservation of energy, will never be born out of nothing, and will not be used 100%.


3。 How to reduce solar power loss

In general, in order to minimize losses, the following measures are often used:

(1) The solar cell module is tilted at a perpendicular angle to the light.

(2) The parameters such as open circuit voltage, short circuit current, working voltage and working current of all components of the solar cell should be as long as possible, and the connecting cable should be as thick and short as possible.

(3) If the battery is connected in series, all the internal resistance of the unit should be as constant as possible and as small as possible.

(4) In order to reduce the loss between the lines, if possible, use a high-voltage, low-current scheme as much as possible, so that the current that the line is subjected to is as small as possible, thereby reducing losses. When designing the control circuit, use as high-quality, stable components as possible.


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