It's doable. You can buy a lithium battery boost module (3.7V to 5V) on Taobao for only 8 yuan! 5V solar panel, lithium battery! 1000 mA is enough, usually sold by those who sell boost modules. Lithium batteries, or you can use batteries that you don't use (make sure the battery has a protective plate and still has some life left, otherwise use nickel-metal hydride batteries, as mentioned below).
The above concerns lithium batteries. You can also use a boost module and one or two high capacity nickel-metal hydride batteries (you can connect them in series and parallel, the final output is 5V, precious). data measured by me! Don't forget to give more points!) You can also use a boost mod. Just use a 2V battery card. It can be used after connecting it. connectthe output from the USB port by the boost module. A data cable can be used to charge a cell phone. It only costs about 50 yuan to achieve the desired effect. It's better to buy the battery board and booster pack in one. If they're not available in a store, then they're not available. There is a way.
You can buy boost modules and rechargeable nickel-metal hydride batteries for work kits in one store. and the quality is good. Many brand products have been stored for a long time and do not have the performance described by traders, the work package battery performance is good, because it is cheap and the performance is the same. same as genuine product from big manufacturer (some factories also use working package and sell it after packing, so there is no difference in general, shipping volume is very important and the goods update speed is very fast). , you can buy new batteries, which guarantees a service life of more than 2 years.
Battery panels need to be purchased from other stores
The mentioned stores above are all Taobao online stores. , it is very difficult to buy what you need in a physical store
First, connect three 6V 40mA battery boards in series to form a group of 18V 40mA. The number is No. 1;
Continue making 9 more such battery packs, numbered 2, 3, 4-------No. 10;
Place number 1 on the positive terminals of battery pack #10. are connected together, and the negative terminals are connected together to form an overall battery of 18 volts and 0.4 amps. A 1N4001 diode is connected in series at its output end, and a solar charger succeeds. The battery can be fully charged in one dayin good weather.