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How to choose solar panel?
- Sep 06, 2018 -

There are many types of solar panels, including polycrystalline solar panels and monocrystalline solar panels. From the voltage, the open circuit voltage is 20V, 30V, 40V and so on. As a professional solar controller manufacturer, Xiamen Lingxia has many years of industry experience and teaches you how to choose the most suitable solar panels and solar controllers.

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1. Selection of monocrystalline and polycrystalline.

Similar power of two solar panels, monocrystalline silicon solar panels than polycrystalline more efficient, less light degradation, but also higher costs. Therefore, monocrystalline or polycrystalline must be chosen according to actual needs.

2. Power selection of solar panels

The choice of how much power the solar panel is related to two factors. One is that the load power is related to the time the load is used. The second is based on the local average sunshine time. The load power and time can be used to calculate the number of WHs consumed per day. The number of WH divided by the average sunshine time is equal to the power of the solar panel. In order to cope with the fact that the solar panels are not charged when the rainy days are basically not charged, the energy of the solar panels to be charged every day must be greater than the energy discharged every day. The excess electricity is stored in the battery and can be used for rainy days.

3. Selection of solar controller

Choose the right solar panel according to the battery voltage. Generally speaking, if the PWM solar controller is selected, the working voltage of the solar panel charged to the 12V battery is 18V. The open circuit voltage of the solar panel charged to the 24V battery is 36V. If it is too high or too low, it is not appropriate.

If you choose the MPPT controller, there is no problem as long as the open circuit voltage of the solar panel does not exceed the maximum input voltage of the controller. As long as the voltage of the solar panel is greater than that of the battery, it can start charging.

The above is the type of solar panels, power, voltage three aspects to do some basic analysis, if you can grasp these three conditions, you can basically determine the specifications of the solar panels.