Solar Powered Cell Phone Charger Circuit

Devices like phones, iPods, smartwatches, and other devices have mostly taken over our lives. One issue that they all have is the requirement to recharge after routine use. When you are somewhere without electricity, it becomes a serious issue. Using renewable energy sources is one approach to solving these kinds of issues.

DIY Solar Mobile Phone Charger Circuit

There are various kinds of renewable energy sources, including solar, tidal, and wind. We will use solar energy in today’s project to recharge our mobile devices. We will need solar panels to turn sun energy into electricity. We’ll examine how a solar panel functions before creating a solar-powered mobile phone charger circuit that will both charge our phone and guard against overcharging the battery. So, let’s learn how to make our own solar phone charger in this project and how it functions.

Hardware Required:

  • Solar panel 5.5V 245mA (3 Nos)
  • 5V Boost converter module
  • Switch
  • Masking  Tapes
  • Wires
  • Soldering kit

Circuit Diagram:

DIY solar mobile phone charger circuit diagram

Simply solder the solar panels in parallel and link them to a boost converter module using a switch, as illustrated in the wiring schematic above. Simply connect your mobile phone to the other end of any power cable and the USB pin of the module at this point. The phone will begin to charge when there is sufficient radiation.

Working Explanation:

The conversion of solar energy into electrical energy is the project’s main principle. We only need a solar panel to do this, but there are many different types and ratings available. We will use the monocrystalline solar panel type since it is more widely available and less expensive than the other two of the three solar panel types—polycrystalline and amorphous.

The voltage and current that the load would consume must be taken into account when determining the voltage and current rating of our panels. The mobile device is the load in this scenario, and it needs approximately 5V and 1A to charge at its fastest possible rate. Since employing solar panels to supply 1A and 5V would make the project larger and more expensive, we chose to build the system for greater than 70% efficiency.

 We have chosen the 5.5V 245mA solar panels as a result. As we all know, connecting it in parallel will maintain its voltage constant and add to the current rating, therefore we’ll be employing three of these panels in parallel. As a result, the three modules’ combined final voltage and current ratings will be 5.5V and 735mA (245+245+245). The table below shows the rating of a single panel.

Solar Panel Details
Output Voltage5.5V
Output Current245mA
Power rating1.2 Watt
Dimension (L*H*B)130mm * 64mm * 2.5mm

As is well knowledge, the amount of solar radiation that strikes the panel directly affects the output voltage and current delivered by the panel. This indicates that our panel won’t always deliver 5.5V and 735mA. Therefore, we require a device that can increase and control voltage to 5V at all times, regardless of radiation. We will use the 5V Boost converter at this point to directly power our phone. Below are the Booster Module’s specifications:

DC-DC Booster Details
TypeBoost Converter
Output Voltage5.1-5.2 V
Operating Input Voltage2.7V-5V
Output Current1.5A (Maximum)
Load Regulation1%

Testing the Solar Cell Phone Charger

The charger’s performance is based on how much current it can provide to charge the phone. This will assist us in quickly charging the phone. We utilised the “Ampere” Android app to figure this out (Downloaded from play Store). This software will inform us of the amount of current required to charge the battery. As you can see in the screen photo below, my phone, an Asus Zenfone, needs roughly 1000mA to charge when connected to a standard charger (AC mains).

Current while Charging phone from AC outlet

Later, after connecting the phone to our solar charger, I measured the current and found that it was approximately 700 mA, which is fairly close to the actual charging current. Even while using solar power to charge the phone, this will assist you in doing so rapidly.

Current while Charging phone from solar mobile charger


Charging phone from solar mobile charger


I hope all of you have understood How to Design Solar Powered Cell Phone Charger Circuit. We MATHA ELECTRONICS will be back soon with more informative blogs soon.

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