Solar Glider DIY MPPT Solar Charge Controler #Electronics part

Solar Glider DIY MPPT Solar Charge Controler #Electronics part


Hi Guys! Here is the section of my build log where I explain how to make the MPPT, for the solar cells. This will be about the electronics part only. The control with the Arduino will be seperate. This is the basic contol mechanism. It is quiet simple. There are however a few items to pay atention to. After searching for a suitable DC-DC converter, we found this one from Banggood. We noticed that the Chinese stuff does not meet the described value, as the maximum output power cannot be achieved. Looking at the converter, besides a lot of capacitors, we see two other components We have searched for the data sheets on google. Where the first is not important to send, the second is the main IC where everything is settled. After some research on google, we found the correct datasheet containing the required information. Here are two points, of which the first describes the pinout. Looking at the description of pin number 2. This pin controls the output voltage. It does this by keeping the threshold voltage at 1,25 volts. More information follow. Looking at some circuit examples, we see this pin 2 coming back with a voltage divider. Let’s put together the most important things. Here we first focus on the explanation of the voltage divider. We have two voltage measurements. We also put a voltage source in the circuit. At the voltage division, a formula belongs … U2=U * R1 / R1 + R2 To make it clear we put the data in a table. Here, the two U’s are the common voltage and the two R’s are the resistance. Here we fill in some values. To know the last value we must use the formula. At the time the voltage shifts while the resistors remain the same, the U2 value increases. Because this value is not equal to 1,25 volts. The converter will decrease the voltage. The opposite thing happens when the voltage drops below the threshold. To give a second example but now with a different resistance value at R1. The other resistance remains the same and because we know that the threshold value must remain the same, the output voltage will change. We now know that a resistance value has to change. This happens by a potentiometer used on the converter. A potentiometer has 3 pins Measured at the outer two pins they have a 15K value. Pin 1 and 2 will vary depending on which direction you turn. Combination 2 and 3 give a value of the 15K minus the value of 1 and 2. It is therefore not possible to reach more than 15k We will not use pin 1 and the current will flow through 2 and 3. By turning the potentiometer the resistance will change and we can control the output voltage of the converter. Let’s have a look at the converter and its components. To make it easy we only show the most important parts. Here we can see a resistor … a capacitor and the potentiometer in the circuit. The capacitor provides a simple filter. All three components will have to be removed or let’s say the circuit has to be interrupted. The next thing to do is to connect pin 2 to an Arduino output with PWM. Here I have for you a simple circuit with only the main components. When you make your own MPPT, look further on in the video for a complete circuit. These 4 will need to be connected to the Arduino through a pin. You can make it yourself easy and take the same as we did, so you can use the same code. For the MPPT algorithm we need to have some measurements from our solar cells and battery voltage. We can build the voltage sensor with 2 resistors. For measuring the current we need a current sensor. The one we use can measure from minus 20 to 20 amps and will give a voltage between 0 and 5. We needed to buy some components. A 20 amp current sensor. You have to choose one with the lowest value, but make sure that it is more than the maximum of the solar cells power. An Arduino nano or another small programming board. We use this because it is easy to use. The converter. 1 Diode 4 Resistors All this for under 15 dollar The description shows the links of the components In the next video we will explain the Arduino code and the MPPT algorithm. So stay tuned and don’t forget to subscribe

12 Comments on “Solar Glider DIY MPPT Solar Charge Controler #Electronics part”

  1. Would you be willing to share the arduino code? I have a few questions about how you've achieved it. Reference voltage is 1.25v, which would correspond to a value of 64 for analogWrite. How far above this value to you set to decrease or increase pulse width in the buck converter?

  2. Awesome way cost effective. Amazing how the pricing has gone down so much for the RC hobbies and wishing more get into electronics in healthy, safe and generally well being ways.

  3. This is the link to the resistors https://www.ebay.co.uk/itm/64-values-1280pcs-1-ohm-10M-ohm-1-4W-Metal-Film-Resistors-Assortment-Kit/261374861457

  4. Thanks for the video! At 5:34 it looks like the FB on the XL4016 is connected to a PWM output on the Arduino. Is this correct? The data sheet says that the "Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it".

  5. Did you consider powering the motor directly from the solar panels and not having a battery? No battery and no DCDC would be a big weight saving. I tested this using a trust stand https://www.youtube.com/watch?v=bTIRTGlTLms As the throttle is increased the thrust increases until you reach a certain point where the power drops off (as you might expect). Inverting the aircraft could be problematic. Maybe a small battery only for the servos and radios?

  6. Hi. I have a thesis project. I need to do Mppt buck converter. Have you ever done Mppt buck converter? Can U help me about this issue.Thank U.

Leave a Reply

Your email address will not be published. Required fields are marked *