DIY Solar Battery Charger (LiPo/Li-Ion)

Introduction: DIY Solar Battery Charger (LiPo/Li-Ion)

About: Awesome Electronics Tutorials, Projects and How To´s

In this project I will have a look at a commercial solar battery charger. That means I will conduct a few tests with it and afterwards create my own DIY version that improves the functionality of such a solar battery charger. Let's get started!

Step 1: Watch the Video!

The video gives you all the information you need to create your own Solar Battery Charger. During the next steps though, I will present you some additional information.

Step 2: Order the Components!

I got my components from LCSC.com: https://lcsc.com/

Here you can download the BOM files for the project. There you can find the part numbers. But feel free to check with the schematic whether you ordered all the required components.

Step 3: Order the PCBs!

Here you can find the schematic, board layout and Gerber files for the project. Feel free to upload the Gerber files to https://jlcpcb.com/quote to order 10 PCBs for cheap.

Or you can simply open my EasyEDA project with my board design and click the fabrication output button: https://easyeda.com/GreatScott/SolarLiPoChargeProt...

Step 4: SOLDER!

There is not much to say here. Solder all the components to the board and you are done. Feel free to use the attached pictures as a reference.

Step 5: Success!

You did it! You just created your own Solar Battery Charger.

Feel free to check out my YouTube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

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    12 Discussions

    0
    hirani89
    hirani89

    3 months ago

    I have downloaded the files and assembled everything. The components run really hot. So hot that I can't touch them for more than 2 seconds. Is there anything wrong I am doing?

    0
    framsone
    framsone

    Tip 9 months ago

    As others have noted, several items that are used in the project are not in either of the LCSC BOMs. Additionally, there are two items that are in the BOM that are not in the schematic, and appear to be unnecessary.
    Unnecessary items:
    LCSC
    Part Number Description C141427 Aluminum Electrolytic Capacitors - SMD 100uF ±20% 35V SMD,6.3x7.7mm RoHS C172351 Multilayer Ceramic Capacitors MLCC - SMD/SMT 47uF 16V 1206 RoHS
    Here are the ICs, capacitors, resistors, and LEDs that are mentioned in the schematic that are not in the BOM (note: does NOT include on/off switch or screw terminals):

    LCSC
    Part Number Description C159890 Chip Resistor - Surface Mount 100Ohms ±5% 1/8W 0603 RoHS C159894 Chip Resistor - Surface Mount 120Ohms ±5% 1/8W 0603 RoHS C131707 Chip Resistor - Surface Mount 1KOhms ±5% 1/8W 0603 RoHS C384268 Chip Resistor - Surface Mount 2KOhms ±5% 1/10W 0603 RoHS C384193 Chip Resistor - Surface Mount 7.5KOhms ±5% 1/10W 0603 RoHS C84817 DC-DC Converters Step-Up Adjustable 1 2V 24V 28V SOT-23-6 RoHS C205443 Light Emitting Diodes (LED) Green 520~535nm 150mcd@5mA Surface Mount 0603
    RoHS C118330 Light Emitting Diodes (LED) Red 619~625nm 30~50mcd@5mA Surface Mount 0603
    RoHS C32254 MOSFET 2 N Channel(Dual) 20V 6A 1.2V @ 250uA 28 mΩ @ 4A,4.5V SOT-23-6
    RoHS C42998 Multilayer Ceramic Capacitors MLCC - SMD/SMT 100nF 50V 0603 RoHS
    Hopefully this helps someone, so they won't have to place an order, wait a month for it to arrive, realize half the necessary components are missing, and then be required to place a second order.

    0
    armins2
    armins2

    1 year ago

    Hello , can you help me about choosing inductor for limited charging current of 1A and input voltage of max 14v ? , i'm using different chip from same company but it has same working principle. i'm using chip for two series connected li-ion cells so my vbatt is 8.4v .I get some value but not shure is it correct example for all my values i calculated inductance of 28uH but max current of inductor should be 1.5A or 2A , how to choose that ? ic is "CN3795"

    1
    Omar Alkassab
    Omar Alkassab

    1 year ago

    Dear Scott, can you tell me what are changes should be made to let this circuit to charge 12V 7Ah sealed lead acid battery? I want 3 connectors: one for the solar panel, one for the battery and one for load.
    Thank you in advance

    0
    georgek52
    georgek52

    1 year ago

    awesome work Scott. Can you please let me know what resistors I have to use for a 12v 10W panel?

    0
    georgek52
    georgek52

    Reply 1 year ago

    anyone? i'm almost ready to start soldering :(

    0
    Efficient Sparks
    Efficient Sparks

    1 year ago

    Terrific job! Your tutorials are always so presice and consise. I will always await for the realease of new videos of yours!

    2
    Spike718
    Spike718

    1 year ago

    For those who are new such as myself there are additional components not in the Sheets.
    Resistors in the 0603 Package:
    100, 1K, 2k, 7.5K, 33K, 180K (if using 18V-21V panel), I May be missing a resistor if using 5V panel.

    LEDs: 0603 Package - Red/Green/What Ever Color

    Correction- If your going to use a 18V-21V panel you can use a 28K instead of using a 33K+180K- In parallel.

    More Parts:
    C84817 - MT3608 - saw it in the EDA tool after thinking about what is doing the step-up

    C32254 - FS8205
    - Saw it in EDA Tool.

    I think for a 5V panel, the resistors could be 8.66K for R9 and 2.74K but I'm not 100% sure on this.


    Total Items missing:
    Resistors in the 0603 Package:
    100, 1K, 2k, 7.5K, 33K, 180K OR 28K(if using 18V-21V panel)
    LEDs: 0603 Package - Red/Green/What Ever Color
    C84817 - MT3608 - DC-DC Converters Step-Up Adjustable 1 2V 24V 28V SOT-23-6

    C32254 - FS8205
    - MOSFET 2 N-Channel (Dual) 20V 6A 1.2V @ 250uA 28 mΩ @ 4A, 4.5V SOT-23-6

    0
    CrazyW
    CrazyW

    1 year ago

    Can I use arduino to adjust the mppt voltage ?

    0
    Spike718
    Spike718

    Question 1 year ago on Introduction

    Thanks for the schematics and the videos!
    What LED # did you use? I wanted to try and make this but the sheet did not include the LEDs
    Thanks Again!

    0
    GreatScottLab
    GreatScottLab

    Answer 1 year ago

    It was a generic 0603 SMD LED. Any should do.

    0
    jrock321
    jrock321

    1 year ago on Introduction

    This is a great project. I would like this with a potentiometer to adjust the mppt voltage.