USB female plug refers to the USB interface definition of USB male plug, and the corresponding +5V and 0V can be connected!
USB is a commonly used PC interface. It has only 4 wires, two for power and two for signals as shown below. Therefore, the signals are transmitted serially and the USB interface is. also called series. The speed of USB 2.0 can reach 480 Mbps. It can meet various industrial and civil needs
The four lines of the USB interface are generally distributed as follows . Never reverse the positive and negative poles, otherwise it will burn the USB device or the computer south bridge chip:
Black wire: gnd (0V)
Red wire : vcc (+5V)
Green wire: data+? (The charger does not connect to this communication data line)
White wire: data- (The charger does not connectnot to this communication data line)
As for how to make a solar charger, I think the article "Low Carbon Master DIY Solar Charging Station" explains it. already explained in detail!
Yes, there must be. Plugging in two USBs is equivalent to connecting two electrical devices in parallel on the original circuit, and the current will be affected. of. However, for pure daily use, this difference is negligible. Therefore, it will not affect your use and electrical appliances. If it really doesn't work, you can always remove one. I hope this will help you !