Solar panel of such small size and power is not suitable for further circuit conversion to Buck or Boost.
So you can measure the open circuit voltage of your solar panel, which is best at noon. the sun, without any load, use a multimeter to measure the output voltage of the solar panel. Divide the measured voltage number by 2 to obtain half the open circuit voltage value. Then, batteries with a nominal voltage similar to this half-open circuit voltage can be directly connected and charged.
For example, the open circuit voltage you measured is 2.5V, then this solar panel can directly charge a nickel-metal hydride battery with a rated voltage of 1.25V
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That is to say, the solar panel The positive electrode of the panel is directly connected to the positive electrode of the battery, and the negative electrode of the pSolar ring is directly connected to the negative electrode of the battery. Just put it under the sun. Note that solar panels are not afraid of the sun, unlike rechargeable batteries. Do not expose rechargeable batteries to direct sunlight. If you have any questions, please ask.
How to make a solar charger. Use a solar panel with a voltage of 1 volt. Is it OK to charge a 7.2 volt power supply after boosting it? How to make a booster battery
Hello friends; if the cell phone is powered by 4.2V, there will be no problem! (The principle is that the power memory is not reversed!) The charging input of mobile phones is 5.0V. Motorola mobile phones will automatically turn on without the original charger, cannot read SD card, touch screen crashes, automatically run programs, etc. . Thisis related to the definition of the internal data transmission line of the USB data cable, and non-original chargers may cause serious electromagnetic interference. Regarding the definition of the transmission line of the USB data cable, you can identify it by shorting the middle two pins of the USB output of the charger. If there are still strange defects, it means that the charger is too crude and has poor electromagnetic compatibility. with another. A charger from a higher quality brand will do the trick if you follow the same method. I hope this will help you !
How to convert a cell phone charger into a solar charger?
The output voltage of the solar panel is 1V and its power is very low. After being boosted and stabilized, its output voltage is assumed to be 7.4V, its output current should also be generally very low. While speaking, charge aThe 3.7 V lithium battery requires a current of 180 mA. A lead acid battery requires a higher current. A 7.2V supply requires 150mA. It is impossible to make such a charger.
I want to make my own. own Sanyo 18650 lithium battery The charger and solar panel input 5V, 900mA power supply. Do I need something to protect the battery if it's charging?
1: Solar cells are relatively expensive. A 10 square centimeter solar cell costs a few yuan (that was the price a few years ago, but I think it's not far now). The output voltage of a battery panel of this size is still very low, insufficient to charge a mobile phone. The voltage required to charge the mobile phone should be at least 4.2V, and the charging current should be greater than 100mA, otherwise the battery may not be fully charged for a dayournée. 2: Solar cells have high environmental requirements for charging. Solar panels exposed to sunlightThe output voltage when exposed to direct light is very different from when there is no sunlight. It is almost impossible to use it without sunlight. 3: When charging, it is impossible to put the mobile phone and the solar battery in the same environment (most electrical products are not suitable for direct sunlight and can easily cause the internal parts to age). In other words, the solar battery may need to be wired from outside to inside to charge the mobile phone. In this way, the charger is not convenient to carry. If you notice these problems and think they can still be solved, the general approach is as follows: 1: First, determine whether you want to charge the solar battery ddirectly on the battery or supply it to the cell phone? To charge the battery directly, the maximum charging voltage should be limited to 4.2 V; if it is provided to a cell phone, it also depends on the brand of the cell phone. Battery voltage based on N should be around 5.6V. and other brands may be different. (The current does not need to be limited, because the output power of the solar cell is limited, so there is no need to worry that the current will be so large that the battery will be damaged) 2 : Because the output voltage of the solar panel is relatively low, you should try to increase the output voltage. There are two methods, one is to connect multiple batteries in series and the other is to use a step-up IC to increase the voltage. The latter method is inexpensive and commonly used. Another advantage of this method is that it cant stabilize the output voltage while increasing it.
First of all, you need to use the CN3063 solar power specific charging management chip, which can automatically adjust the output current according to the input voltage source
To carry out mobile power supply, you need to use lithium battery charging management board, lithium battery booster board, lithium battery protection board, these three are key parts
Other accessories can be purchased separately