I know two of the most famous
Power Cabin from Patriot
and
Solar Magic Box from Solar Technology
< p>It seems than that of Sunlight Magic Box is more professional. .The poster can search for its relevant information~
I hope it can be useful to you~
1: Solar cells are more expensive, 10 square centimeters Solar cells cost a few dollars (that was the price a few years ago, but I imagine it's not that far off 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 more than 100mA, otherwise the battery may not be fully charged for a day. 2: Solar cells have high environmental requirements for charging. The output voltage of asolar panel is very different when exposed to direct sunlight and when not exposed to 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 find these problems and think they can still be solved, the general approach is as follows: 1: First, consider whether you want to charge the solar battery directly to the battery or supply it to the mobile phone? To directly charge the battery, the maximum charging voltagemust 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 cell 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 can stabilize the output voltage while increasing it.