Yan et al. (2016b) also proposed a rechargeable battery-operated portable electrospinning setup based on a solar cell and hand generator supply, as shown in Fig. 2.20. The designed solar and hand generatoreoperated portable electrospinning device can be treated as a contractible typical electrospinning device as shown in Fig. 2.20. In particular, the power supply system of the designed solar cell and hand generator-powered portable electrospinning (SHPE) apparatus includes a solar cell (5 V/140 mA), a hand generator (5 V/200 mA), a set of rechargeable batteries (NiMH AA), and a highvoltage converter (FBY-4.8 V), as displayed in the middle of Fig. 2.20A, which can minimize the volume and weight, thus improving the portability of the device, and ensure that the device works anywhere. When not being used, this device can be placed in sunshine to generate electricity by the solar cells, and turning the handle of the hand generator can provide stable electricity for power supply by spinning a coil of wire around a magnet. Moreover, the generated electricity can be stored in the rechargeable batteries and then translated into high voltage through the high-voltage converter, from about 3.6 V to 3.8 kV, which could ensure the use of some kinds of polymer solutions and melt electrospinning at a fixed distance. In addition, to achieve a higher and tunable voltage, the highvoltage converter can be changed to an F101 (EMCO High Voltage Corp., USA), for which it has been reported that voltages could be selected between 0 and 14 kV. By using this setup, various kinds of polymer solutions can be electrospun into fibers as shown in Fig. 2.20B and C. Moreover, the designed apparatus can satisfy melt electrospinning needs with a heating system addition. Also, this setup ensures applications for wound healing outdoors (Fig. 2.20D), because of its portability and efficiency (Yan et al., 2016b).